WESTERN NORTH AMERICAN PALEOZOIC DEPOSITS

Donald Kenney (donaldkenney@gmail.com)
Last Update: Sun Sep 4 03:13:47 2016



INCOMPLETE WORKING VERSION OF FILE WPALEO.T2T

Introduction

In previous terrane discussions, I have stuck to areas that geologists recognize as "terranes", but now we have come to the biggie for North Americans -- the rocks at the core of the North American continent. The area involved is very large. As is the number of formations and groups. Fortunately, it can be subdivided reasonably easily into Eastern and Western parts separated by a wide belt of Cretaceous and Tertiary rocks in the Great Plains that separates the two halves. This West Laurentian terrane includes Triassic and older rocks found in the Black Hills, West Texas, Western Oklahoma and the Rocky Mountain foothills and everything West to the Pacific other than a couple of minor terranes near the Pacific Coast. Jurassic and younger rocks are described in the Mid-continent-sea and Pacific Margin terranes.

The pattern of depositation in the Western Laurentian Paleozoic is not as consistent as that in East Laurentia. With the exception of a long sequence of Cambrian marine rocks transgressing Eastward all the way to the Rockies as time passed, the rocks seem to consist mostly of discontinuous marine rocks of various ages becoming less common as one moves later in time. There are few continental rocks and virtually none of the coals that are so common in the Upper Paleozoic of Eastern Laurentia.

Missing formations

Fossils:

The Rocks

SOUTHWEST US

General

GENERAL
MOJAVE DEATH VALLEY GRAND CANYON INYO MOUNTAINS UTAH-NEVADA
Ediacaran Wyman

thick age rocks where underlaying overlying equivalents fossils: [ GEOLEX link NO cgkn link group

#need to pick up oregon mesozoic & permian

Eugene

Yamhill

John Day

Abercrombie

Up to 900 meters of fossiliferous, often very thin bedded, Middle Cambrian limestone and shale found in West Central Utah. It overlies the Busby Quartzite and is overlain by the Young Peak Formation.

Fossils: Trilobites, brachiopods, mollusks

Abilene

80m Permian,Lower limestone,clay,shale,gypsum TX Lueders Vale Arroyo fossils:present GEOLEX link NO cgkn link Wichita

Abo Formation

Up to 300 meters of redbed Lower Permian sandstone and shale above a basal conglomerate. It is found in central New Mexico. Overlies the Madera Limestone/Nakaye Limestone and is overlain by the Yeso Formation. It is the oldest member of the Manzano Group.

Fossils: A few marine fossils in thin limestone beds near the base. A few plants in the upper beds.

Abrigo Limestone

Up to 230 meters of Middle and Upper Cambrian thin bedded cherty limestone found in Southern and SouthEastern Arizona. It overlies the Bolsa Quartzite and is overlain by the Martin Formation

Fossils: ichnofossils. Enough trilobites and brachiopods to establish age.

Adams Branch limestone

30m Pennsylvanian,Upper limestone TX(c) Brownwood Cedarton fossils:foraminifers,corals,brachiopods,gastropods,pelecypods GEOLEX link NO cgkn link

Adolphus

Hota-Adolphus Limestone

Admiral

107m Permian,Lower limestone,shale TX Putnam Belle Plains fossils:vertebrates? GEOLEX link cgkn link Wichita

Ajax Dolomite

Up to 275 meters of dark Upper Cambrian and Lower Ordovician dolomitic limestone with a light colored middle member found in Utah(c). It overlies the Opex Dolomite and is overlain by the Opohonga limestone

Fossils: poorly preserved gastropods, brachiopods, conodonts

Ajax

Early Paleozoic (Cambrian?-Devonian?) massive quartzite and mudstone found in British Columbia(se). It overlies the Triune Formation and is overlain by the Sharon Creek Formation. Not to be confused with the Ajax Quartzite in Arizona or the Ajax Dolomite in Utah. It is a member of the Lardeau Group -- a sequence of unfossiliferous clastic sediments found in the Kootenay Terrane whose age is constrained by Lower Cambrian and Mississippian fossils in underlying and overlying beds.

Fossils: None?

Akie

A term for non-silaceous Devonian and Mississippian silty shales found in NorthEast British Columbia. Although it is laterally equivalent to the Warneford Formation/Gunsteel Formation it mostly overlies the Gunsteel Formation and is mostly overlain by the Warneford Formation. It is not to be confused with the older Akie Reef Formation/ It is a member of the Earn Group

Fossils: A few conodonts

Akie Reef

200 meters of fossiliferous Middle Devonian Carbonates contemporaneous with Paul River dolomitic siltstones it overlies Road River Silurian sandstones and is overlain by the Gunsteel formation. Includes similar Pesika Reef /Kwadacha Reef limestones

Fossils: Marine invertebrates

Akmalik Chert

80 meters of Upper Mississippian and Lower Pennsylvanian black chert with minor shale, mudstone, and limestone found in Alaska(n). It overlies the Kayak Shale and is overlain by the Imnaitchiak Chert. It is a member of the Lisburne Group.

Fossils: Radiolaria, conodonts, plants(rare?)

Albany

360m Permian,Lower shale,clay,limestone,coal TX(c) Waldrip/Cisco Wichita Wichita fossils:present GEOLEX link NO cgkn link

Algae Limestone

266m Proterozoic Upper-Cambrian Lower limestone,dolostone YU Yusezyu Formation Ingta Yusezyu Group/Backbone Ranges/Risky stomatolites NO GEOLEX link [http://weblex.nrcan.gc.ca/html/017000/GSCC00053017082.html] Yusezyu Group

Al Rose Formation

15 meters of brown weathering fossiliferous thin bedded Lower Ordovician siltstone, shale, and limestone found in the Inyo Mountains of California. It overlies the Tamarack Canyon Dolomite and is overlain by the Badger Flat Limestone. It is a member of the Mazourka Group.

Fossils: Graptolites, Trilobites

Aladdin Sandstone

A name proposed, but never much used for an interval of Lower Ordovician sandstone exhibiting numerous Scolithos burrows found in Wyoming and South Dakota. Older and modern usage is to ascribe these beds to the Deadwood Formation.

Fossils: icnofossils-Scolithos

Alapah Limestone

295 meters of Upper Mississippian limestone, shale and chert found in Alaska(n). It overlies the Wachsmuth limestone and the top of the formation is not exposed. It is a member of the Lisburne Group.

Fossils: corals, brachiopods

Alaska Bench Limestone

50 to 100 meters of fossiliferous gray to red Lower Pennsylvanian limestone found in Montana(c) and North Dakota. It overlies the Tyler Sandstone and is overlain by the Ellis Group/Tensleep Sandstone/Devils Pocket Formation. Assigned to the Fergus and Amsden Groups.

Fossils: marine invertebrates

Alder Sandstone

An obsolete term for beds now assigned to the lower Mount Cap Formation. Not to be confused with the Proterozoic Alder Formation found in Arizona
230m Lower and Middle Cambrian sandstone,(shale?,limestone?) NorthWest Territories(W) Echo Canyon Limestone Clemis Mount Cap fossils-Trilobites?,others? NO GEOLEX Entry cgkn http://weblex.nrcan.gc.ca/html/000000/GSCC00053000195.html

Aleman

55 meters of Upper Ordovician Dolomite and chert found in Arizona?, New Mexico and Texas. It overlies the Upham Dolomite and underlies the Cutter Formation. It is a member of the Montoya Group

Fossils: Irregularly fossiliferous with well preserved chert replaced shells

Alexo Formation

100 meters of Upper Devonian siltstone and silty dolomites found in the Rocky Mountains of Alberta. It overlies the Southesk Formation/Mount Hawk and is overlain by the Palliser formation. It is contemporaneous with the Lower Southesk Formation, Sassenach Formation, Crowfoot Formation, Calmar Formation and Graminia Formation.

Fossils: Sparse marine invertebrates-brachiopods

Allamoore

300m+ precambrian limestone,chert,volcanics TX(w) Carrizo Mtn Schist Hazel fossils:algae? GEOLEX link NO cgkn link

Allan Mountain Limestone

185 meters of Lower Mississippian limestone found in Montana(w) It overlies Devonian Jefferson Limestones and is overlain by the Castle Reef limestone. It is a member of the Madison Group

Fossils: sometimes abundant corals, bryozoa, brachiopods, crinoids, pelecypods

Amaranth

67m Triassic-Jurassic,Lower Clay,shale,dolomite,limestone,Gypsum MB,ND,SD,WY Madison Group Sundance,Reston Reston,Piper fossils:None GEOLEX link cgkn link

Amsden Group

Up to 115 meters of red Upper Mississippian and Pennsylvanian shales, limestones, and sandstones found in Idaho,Montana,North Dakota, and Wyoming. It overlies the Sacajawea Formation/Madison Formation/Big Snowy Formation and is overlain by the Quadrant Formation/Tensleep Formation. It includes the Alaska Bench Limestone, Darwin Sandstone, Horseshoe Shale Member, Moffat Trails Limestone Member,Ranchester Limestone Member

Fossils: Sparse marine invertebrates-brachiopods, corals, bryozoans, etc.

Anchor Dolomite

Up to 120 meters of massive grey Lower Mississippian Limestone or dolomite with abundant chert nodules found in the region where California, Nevada and Arizona meet. It overlies the Dawn Dolomite and is overlain by the Bullion Limestone. It is a member of the Monte Christo Formation.

Fossils: Sometimes abundant Brachiopods, Corals, Bryozoa

Andrews Mountain Formation

800 meters or more of fossiliferous Lower Cambrian quartzite and shale found in the area of the Inyo,White,and Silverpeak ranges in California and Nevada. Overlies the Deep Spring Formation and is overlain by the Montenegro Formation. It is the lower member of the Campito Formation It is part of a thick sequence of Middle Cambrian, Lower Cambrian and late Proterozoic outer shelf sediments with different nomeclature than the corresponding nearer shore sediments found further East. The Campito has a small fauna of very early trilobites.

Fossils: Sparse trilobites-the earliest known from North America.

Ankareh Shale

396m Triassic shale,sandstone,limestone ID(se)/UT(n)/WY(w) Thaynes/Deadman Chinle/Nugget/Stanaker fossils:petrified wood GEOLEX link NO cgkn link

Aneth

50 meters of Upper Devonian shale and dolomite found in the four corners region where Arizona, Colorado, New Mexico, and Utah meet. It is known primarily from well borings. There may not be any surface exposures. It overlies the Ophir Formation and is overlain by the McKracken Sandstone.

Fossils: fish scales and plates.

Antelope Creek

? Pennsylvanian sandstone TX(c) Comanche Creek Indian Creek fossils:? GEOLEX link NO cgkn link Strawn

Antelope Range Sandstone

30 meters of Lower Mississippean sandstone found in Nevada. It overlies the Kinkead Spring Limestone/Devils Gate Limestone and is truncated above by faulting in all identified exposures.

Fossils: plants, spores, conodonts

Antelope Valley Limestone

Up to 350 meters of Early and Middle Ordovician limestones found in California and Nevada. It overlies the Ninemile Formation/Stoneberger Shale and is overlain by the Eureka Quartzite/Copenhagen Formation/Caesar Canyon formation/Diana. It is a member of the Pogonip Group.

Fossils: abundant fossils in some beds

Anvil Range Group

1070 meters of Mississippian and younger argillite,slate and volcanics with minor components of other types found in the Yukon Territory. It overlies the Earn Group

Fossils: Marine invertebrates?

Arbuckle

1829m Cambrian,Upper-Ordovician,Lower limestone/shale/chert MO,OK Reagan Simpson fossils:some marine invertebrates GEOLEX link NO cgkn link Arbuckle

Arco Hills

94m Mississippian,Upper limestone,mudstone,sandstone ID(c) Surrett Canyon Bluebird Mountain Big Snowy fossils:forams, brachiopods, corals, echinoderm, bryozoans, crinoids, and trilobites GEOLEX link NO cgkn link

Arctomys

336 meters of red/grey/green Middle Cambrian shales found in Alberta and British Columbia. It overlies the Pika Formation and is overlain by the Waterfowl Formation.

Fossils: None?

Arcturus

305m+ Permian,Lower limestones NV(ec),UT(wc) Ely,Riepetown Ruth Supai fossils:abundant-corals,fusulinids GEOLEX link NO cgkn link

Ardath Shale

70m Eocene,Middle shale,sandstone,slate CA(sw) Mt Soledad Scripps Torrey fossils:marine invertebrates-mollusks GEOLEX link NO cgkn link La Jolla

Arnica

Up to 625 meters of Lower and Middle Devonian dolomitic limestones found in the NorthWest Territories. It overlies the Sombre/Delorme/Camsell Formations and is overlain by the Manetoe/Landry/Natla/Grizzly Bear Formations. It is laterally equivalent to the Bear Rock/Gossage/Road River/Stone/Ernestina Lake Formations.

Fossils: Unknown

Aromas

244 Pleistocene? sandstone CA(wc) Monterey/Purisima/San Lorenzo/Vaqueros fossils: none GEOLEX link NO cgkn link

Arrowhead

Thin bedded Mississippian Blue and Grey limestones and shales found in the region where California, Nevada and Arizona meet. It overlies the Bullion Dolomite and is overlain by the Yellowpine Limestone. It is a member of the Monte Christo Formation.

Fossils: Sometimes abundant marine invertebrates

Arroyo

76m Permian,Lower limestone,marl,shale,gypsum TX(c) Lake Kemp/Lueders Vale fossils: GEOLEX link NO cgkn link Clear Fork

Arroyo Penasco

Up to 100 meters of Mississippian sandstone, shale, limestone and chert found in New Mexico. It overlies preCambrian metamorphic rocks and is overlain by the Log Springs Formation/Sandia Formation

Fossils: forams, corals, conularids, bryozoans, crinoid debris,brachiopods, mollusks, and ostracodes

Ashern Formation

Up to 55 meters of red, thin bedded Upper Silurian/Lower-Middle Devonian dolostones found in North Dakota, Montana, and Manitoba. It overlies the Stonewall Formation/Sherven Formation and is overlain by the Elm Point Limestone

Fossils: sparse-cephalopods, gastropods, brachiopods, conodonts

Atan Group

1500m Cambrian,Lower limestone,sandstone,limestone BC,YT Ingenika Group Kechika fossils:archeocyathids NO GEOLEX link cgkn link

Atikameg Dolomite

5 meters of sparsely fossiliferous Silurian dolomite found in Manitoba It overlies the Moose Lake dolomite and is overlain by the East Arm dolomite

Fossils: A few marine invertebrates

Atoka

2134m Pennsylvanian,Middle sandstone,shale,coal AR,OK Wapanucka Hartshorne fossils:None GEOLEX link NO cgkn link

Aubrey Group

Up to 850 meters of Permian marine and non-marine detrial formations found in Arizona, New Mexico and Utah. It overlies the Redwall Limestone and is overlain by the Moenkopi Formation. It includes the Supai, Coconino, and Kaibab Formations.

Fossils: Mostly sparse. Trackways, marine vertebrates and invertebrates in some beds

Avalanche

400 meters of Middle Cambrian dolostone and siltstone found in the Northwest and Yukon Territories. It overlies the Backbone Ranges Formation and is overlain by the Broken Skull. It is Laterally equivalent to the Rockslide Formation

Fossils: Trilobites

Avenal

152m Eocene,Lower-Eocene,Middle sandstone,conglomerate CA(wc) Panoche[Panoche] Kreyenhagen fossils:marine invertebrates GEOLEX link NO cgkn link

Avis Sandstone

12m Pennsylvanian,Upper sandstone TX(nc) Wayland/Gunsight/Speck Mtn Breckenridge/Chaffin/Ivan fossils:none? GEOLEX link NO cgkn link Thrifty

Aztec

732m Triassic-Jurassic,Lower sandstone,quartzite AZ?/CA(se)/NV(se) Chinle/Bird Spring recent sediments Navajo fossils:reptile tracks(uncommon) GEOLEX link NO cgkn link

Backbone Ranges

1430 meters of Proterozoic to Early Cambrian sandstone with minor dolomite, shale and conglomerate found in British Columbia, the Northwest Territories, and the Yukon Territory. It overlies the Windermere/Sheepbed Formations and is overlain by the Sekwi/Avalanche Formations It is laterally equivalent to the Old Fort Island Formation.

Fossils: Abundant ichnofossils in some beds

Badger Flat Limestone

180 meters of fossiliferous Middle Ordovician limestone, siltstone, and chert found in the Inyo Mountains of California. It overlies the Al Rose Formation and is overlain by the Barrel Spring Formation. It is a member of the Mazourka Group.

Fossils: Sometimes abundant, diverse marine invertebrates - brachiopods, trilobites

Badshot Limestone

About 100 meters of Lower Cambrian limestone found in British Columbia. It overlies the Hamill Formation and is overlain by the Lardeau Formation.

Fossils: None?

Bailey Spring Limestone

300m? Carboniferous limestone NV(ec) Scotty Wash ? Ely/Bird Spring fossils:? GEOLEX link NO cgkn link

Baird

152m Mississippian-Pennsylvanian,Lower shale CA(nw) Bragdon McCloud fossils:marine invertebrates [GEOLEX link [http://ngmdb.usgs.gov/Geolex/NewUnits/unit_4636.html] NO cgkn link

Baird Group(Alaska)

? Cambrian,Devonian,Middle limestone AK(n) ? Lisburne/Endicott Group fossils:marine invertebrates(uncommon) GEOLEX link NO cgkn link Baird

Bakken Formation

26 meters of Upper Devonian and Lower Mississippian shale with minor medial sandstone, siltstone, and dolomite found in Alberta, Montana(n), North Dakota(nw), South Dakota, Saskatchewan(s), and Manitoba. It overlies the Three Forks Formation/Qu'Appelle Formation/Wabamun Formation/Big Valley Formation/Torquay Formation and it is overlain by the Lodgepole Limestone/Madison Limestone. It is a member of the Three Forks Group. There may be no surface outcrops

Fossils: conodonts, a few inarticulate brachiopods

Bancroft Limestone

170 meters of silty Middle Cambrian limestone found in Idaho(SE) and Utah. It overlies the Lead Bell Shale and underlies the Blacksmith Limestone

Fossils: Girvanella, some trilobites near top of formation

Banff Formation

Up to 450 meters of Upper Devonian and Lower Mississippian shale and silty carbonates found in Montana, Alberta, British Columbia, and The District of Makenzie. Possibly in North Dakota(n),South Dakota(w) and Wyoming(ne) as well? It overlies the Palliser Formation/Wabamun Formation/Exshaw Formation and is overlain by the Pekisko Formation/Livingstone Formation/Shunda Formation

Fossils: Well preserved crinoids at one locality. brachiopods, etc

Bar B

More than 110 meters of Upper Pennsylvanian limestone,shale,siltstone,conglomerate and sandstone found in Arizona(se)? and New Mexico(sc). It overlies the Nakaye Formation and is overlain by the Abo Formation/Bursum Formation It is a member of the Magdalena group

Fossils: abundant fossils - especially bryozoa

Barker Formation

An obsolete term for 245 meters of Middle and Upper Cambrian shale,sandstone,and limestone found in Montana. In modern usage, it is divided into the Yogo limestone,Dry Creek shale,Pilgrim limestone,Park Shale,Meagher limestones,Wolsey shale and Flathead sandstone. It overlies precambrian metamorphics and is overlain by the Monarch Formation

Fossils:

Barnett

15m Mississippian shale OK(sc),TX(c) Ellenburger Marble Falls fossils:marine invertebrates GEOLEX link NO cgkn link Bend

Barrel Spring

up to 60 meters of sometimes fossiliferous Middle Ordovician limestone, shale and quartzite found in the Inyo Mountains of California. It overlies the Badger Flat Limestone and is overlain by the Johnson Spring Formation. It is a member of the Eureka Group.

Fossils: Sometimes abundant in the shale member -- conularids, brachiopods, trilobites, and echinoderms

Basal Formation

Precambrian argillite found in British Columbia. It is a member of the Richfield Formation

Fossils: None?

Bat Cave

Up to 300 meters of Lower Ordovician limestone and dolomite found in New Mexico(sw). It overlies the Sierrite Limestone and is overlain by the Cable Canyon formation. A member of the El Paso Limestone

Fossils: A few marine invertebrates

Bay State Dolomite

Up to 300 meters of massive bedded Middle Devonian dolomite found in Nevada(ec) It overlies the Woodpecker Limestone and is overlain by the Devils Gate Formation. It is the uppermost member of the Nevada Limestone

Fossils: Brachiopods

Bayhorse Dolomite

550m Cambrian,Upper-Ordovician,Lower dolomite,chert,breccia,conglomerate ID Garden Creek Ramshorn St Charles /Red Lion fossils:A few fragmented brachiopods,echinoderms GEOLEX link http://ngmdb.usgs.gov/Geolex/NewUnits/unit_6722.html NO cgkn link

Beacon Peak Dolomite

Up to 300 meters of Lower Devonian dolomite found in Nevada(ec). It overlies the Lone Mountain Dolomite and is overlain by the Oxyoke Canyon Sandstone/McColley Canyon Formation. It is a member of the Nevada Formation

Fossils: A few conodonts

Bear Gulch Limestone

Up to 65 meters of Early Pennsylvanian limestone and calcaerous shale found in Montana and North Dakota where it overlies and is overlain by unnamed members of the Tyler Formation

Fossils: Diverse, well preserved brackish and fresh water fossils. Fish, invertebrates, soft body material preserved.

Bear River

Jurassic tuff,breccia,limestone,quartzite AK(se),BC Beckwith Hazelton fossils:None? GEOLEX link cgkn link Hazelton Not to be confused with Pleistocene Bear River beds in NT

Bear Rock

Up to 1500 meers of Upper Silurian to Middle Devonian limestone,dolomite, and carbonate breccias found in the Northwest Territories. It overlies the Mount Kindle Formation/Delorme Formation and is overlain by the Hume Formation/Willow Lake Formation. It is laterally equivalent to the Arnica, Landry, Manetoe, Chinchaga,Gossage,Franklin Mountain, Langton Bay, and Fitzgerald Formations

Fossils: A very few marine invertebrates - brachiopods, ostracods, corals

Beartooth Quartzite

40m Cretaceous,Upper quartzite,shale,conglomerate AZ,NM assorted Colorado Mojado fossils:none GEOLEX link No cgkn link

Beartooth Butte Formation

Usually only three meters or so but as much as 50 meters of Lower Devonian fresh or brackish water channel deposits -- limestone, shale, congolomerate and sandstone -- found in Idaho,Montana,and Wyoming. It overlies the Bighorn Dolomite/Maywood Formation and is overlain by the Jefferson Limestone

Fossils: fish, fish scales, plants

Beaverfoot

600 meters of thin bedded Upper Ordovician(?) dolomite and limestone found in Alberta and British Columbia. It overlies the Mt Wilson Formation and is overlain by the Tegart Formation/Devonian beds

Fossils: Unknown

Beaverhill Lake Group

Up to 229 meters of Middle and Upper Devonian limey shales and nodular limestones found in Alberta,British Columbia, the Northwest Territories, and North Dakota. It overlies the Elk Point Group/Slave Point Formation

and is overlain by the Cooking Lake Formation/Woodbend Formation/Hay River Formation. It includes the Dawson Bay, Souris River, Fort Vermilion, Waterways and Swan Hills Formations.

Fossils: diverse brachiopods, as well as stromatolites,corals, algae,crinoids, ostracods

Beavertail Limestone

20 meters of Middle and/or Upper Devonian limestone and shale found in the Northwest Territories(wc). It overlies the Ramparts Limestone and is overlain by the Canol Formation

Fossils: corals,brachiopods

Beck Spring

About 300 meters of Upper Proterozoic dolomite and shale found the southern Great Basin of California. It overlies the Crystal Spring Formation and is overlain by the Kingston Peak Formation or Noonday Dolomite. It is the middle member of the Pahrump Group.

Fossils: Stromatolites, oncolites, microbes

Beckwith

1676m Jurassic-Cretaceous shale,sandstone,conglomerate UT(ne),WY(sw) Twin Creek Bear River fossils:? GEOLEX link NO cgkn link

Bedford Canyon

9150m Triassic-Jurassic sandstone,shale,schist,quartize,limestone CA(sw) bedrock? Trabuco/Santiago Peak Volcanics fossils:marine invertebrates(uncommon) NO GEOLEX link NO cgkn link

Beecher Dolomite

An Ordovician dolomite found in Utah. As defined, it appears to consist of portions of the Fish Haven and Bluebell Dolomites that under and overlie it. Some authors consider it to be a member of the Bluebell Dolomite Not to be confused with the (obsolete?) Beecher member of the Devonian age Dunleith Formation in Wisconsin and adjacent states.)

Fossils: Unknown. Marine invertebrates are said to be common in some beds of the Fish Haven Dolomite and sparse, but present in the Bluebell Dolomite So probably at least a few fossils, maybe a lot.

Beeman Formation

150 meters or more of thin bedded Upper Pennsylvanian limestone with shale and sandstone. It overlies the Gobbler Formation and is overlain by the Holder Formation. It is a member of the Magdalena Group

Fossils: fusulinids

Belcourt Limestone

48 meters of Lower Permian limestones found in Alberta(wc) and British Columbia(ec). It overlies the Rundle Group/Besa River Shale and is overlain by the Mowitch Formation/Fantasque Formation. It is laterally equivalent to the Belloy Formation

Fossils: sometimes abundant fusulinids, corals

Belden Shale

More than 500 meters of Pennsylvanian shale, limestone, sandstone and coal found in Colorado(c). It overlies the Leadville Limestone and is overlain by the Minturn Formation/Hells Canyon Formation/Maroon Formation

Fossils: Sometimes abundant corals, crinoids, bryozoans, brachiopods

Bell Hill Dolomite

130 meters of gray Middle Silurian dolomite found in NorthWest Utah. It overlies the Floride Dolomite and is overlain by the Harrisite Dolomite. It is a member of the Laketown Dolomite.

Fossils: corals, crinoid columnals, cephalopods, brachiopods.

Belle Plains

122m Permian,Lower limestone,shale TX(c) Admiral Clyde Mountain fossils:? GEOLEX link NO cgkn link Wichita/Belle Plains

Belloy Formation

Up to 275 meters of Permian dolostones and sandstones found in Alberta and British Columbia(ne). Overlies Carboniferous beds and is overlain by Lower Triassic beds. It is laterally equivalent to the Mount Greene Beds/Belcourt Formation/Kindle Formation

Fossils: ammonites, brachiopods, conodonts, spores, forams

Belt Supergroup

Up to 12000 meters of Proterozoic marine sediments found in Idaho, Montana, and Washington. It is overlain by the Flathead Sandstone. The belt supergroup is subdivided into a number of formations.

Fossils: Mostly unfossiliferous. Stromatolites. A few ichnofossils and possibly a few body fossils in the uppermost beds.

Beirdneau Sandstone

About 300 meters of thin bedded, calcaerous, Upper Devonian sandstone found in Utah(n) and Idaho(se). It overlies the Hyrum Dolomite and is overlain by the Madison Formation/Lodgepole Limestone/Leatham Formation Considered by some authors to be the uppermost member of the Upper Jefferson Formation

Fossils: None

Bend

457m Pennsylvanian sand,limestone,shale TX(c) Wilberns Strawn fossils:marine invertebrates GEOLEX link NO cgkn link Bend

Berino Limestone

170 meters of Middle Pennsylvanian limestone with minor chert and conglamerate found in New Mexico and Texas. It overlies the La Tuna Formation and is overlain by the Bishops Cap Formation. It is a member of the Magdalena Formation

Fossils: brachiopods, gastropods, pelecypods, and foraminifers

Besa River Shale

1655 meters of dark Devonian shale with local sandstone or limestone found in the Rocky Mountains and adjacent areas of Alberta, British Columbia and the District of Makenzie. It overlies the Dunedin/Slave Point/Road River/Stone Limestone/Nahanni Formations. It is overlain by the Prophet Formation/Banff Limestone/Yohin Formation/Earn Formation.

It is contemporaneous with parts of the Banff,Yohin,Clausen,Golata,Mattson,Fort Simpson Formations

Fossils: rarely marine invertebrates--sponge spicules, radiolarians or locally plants.

Bighorn Dolomite

60 meters or more of Middle to Upper Ordovician dolomite or limestone above a basal 8 meter sandstone found in Idaho,Montana,Utah, and Wyoming. It overlies the Deadwood Formation/Grove Creek/Red Lion Formation/Emerson Formation/Winnipeg Formation/Flathead Sandstone/Lynch Formation and is overlain by the Littlehorn Limestone/Madison Limestone/Beartooth Butte/Interlake Formation/Stonewall Formation/Darby Formation/Jefferson Formation. It includes Leigh Dolomite and Lander Sandstone members. The Bighorn is laterally equivalent to the Fish Haven Dolomite found to the SouthWest.

Fossils: gastropods, cephalopods, corals, worms, crinoids, brachiopods, a few fish

Big Blue

335m Permian shale,salt,limestone KS,NE WoodSiding Cimarron fossils:present GEOLEX link NO cgkn link Big Blue

Big Goose Member

Up to 100 meters of Lower Mississippian limestone,dolomite,and chert found in Montana(s) and Wyoming(nc). It overlays the Woodhurst Formation and is overlain by the Little Tongue Formation. It is a member of the Madison Limestone

Fossils: Corals, crinoids, conodonts, algae, stromatolites and brachiopods

Big Snowy

Up to 400 meters of Upper Mississippian limestone and sandstone found in Idaho,Montana,and North Dakota. It overlies the Madison Limestone/Charles Formation and is overlain by the Amsden Formation/Bluebird Mountain. Kibbey sandstone, Lombard Limestone, and Conover Ranch, Otter and Heath members are recognized.

Fossils: corals, brachiopods,ostracods,conodonts in some beds.

Big Valley Formation

Up to 40 meters of Upper Devonian limestone with shale interbeds found in Northern Montana, Alberta, and Saskatchewan. It overlies the Stettler Formation/Torquay Formation and is overlain by the Exshaw Formation/Bakken Shale It is a member of the Three Forks Group/Palliser Formation/Costigan Formation

Fossils: Marine invertebrates-brachiopods

Big Valley

107m Pennsylvanian shale,clay,sandstone TX(c) Bull Creek Brown Creek fossils: GEOLEX link NO cgkn link Strawn Not to be confused with the Big Valley formation in Virginia

Bingham Mine

Up to 2000 meters of Upper Pennsylvanian sandstone with numerous limestone interbeds found in Utah(c). It overlies the Butterfield Formation and is overlain by the Curry Formation/Furner Valley It is the uppermost part of the Oquirrh Group

Fossils: fusilinds,corals,brachiopods,bryozoa in the limestones

Birdbear Formation

About 40 meters of Upper Devonian limestone,dolomite,anhydrite and shale. It is found in Idaho(se),Montana(ne),Wyoming,North Dakota,South Dakota, and Saskatchewan. It overlies the Duperow Formation and is overlain by the Three Forks Formation/Madison Formation It is laterally equivalent to the Nisku Formation/Darby Formation It is a member of the Jefferson Group

Fossils: Marine invertebrates in the carbonates-brachiopods

Bishops Cap Formation

About 200 meters of Middle Pennsylvanian limestone with minor sandstone and conglomerate found in New Mexico and Texas. It overlies the Berino Formation and is overlain by the Hueco Formation/Panther Seep. It is a member of the Magdalena Group

Fossils: Fossils (Marine invertebrates?) present

Bird Spring Limestone

Up to 800 meters of Pennsylvanian and Lower Permian Limestone, dolomite, shale and other sedimentary rocks found in Arizona, California, Nevada and Utah. It overlies the Monte Christo Limestone and is overlain by the Supai Formation/Esplanade Sandstone.

Fossils: corals, bryozoans, brachiopods, pelecypods and gastropods.

Bison Creek

203m Cambrian Upper rock_types AB(w) Lyell Mistaya Lynx/Mons/Sabine fossils:trilobites(diverse) NO GEOLEX link cgkn http://weblex.nrcan.gc.ca/html/001000/GSCC00053001405.html

Blach Ranch Limestone

2m Pennslyvanian limestone,clay TX(nc) Eddleman Coal Breckenridge Chaffin fossils:present GEOLEX link NO cgkn link Cisco

Black Prince Limestone

About 40 meters of pink Lower Pennsylvanian(?) limestone sandwiched between reddish shales found in Southern Arizona and possibly in adjacent New Mexico. Overies the Escabrosa Limestone and is overlain by the Naco Limestone/Horquilla Formation. Assigned by some authors to the Hachita Formation

Fossils: Corals, brachiopods, gastropods, bivalves

Blackrock Canyon

A late precambrian limestone found in Idaho and Utah where it overlies the Pocatello Formation and is overlain by the Papoose Creek Formation.

Fossils: None?

Blacksmith limestone

About 175 meters of Middle Cambrian dolomitic limestone found in Idaho(se) and Utah(nc). It overlies the Ute Formation/Bancroft Limestone and is overlain by the Bloomington Formation

Fossils: Abundant Middle Cambrian marine invertebrates in some exposures

Blaine

183m Permian,Lower shale,gypsum,dolomite CO,KS,OK,TX Chickasha/San Angelo / FlowerPot Whitehorse/Dog Creek fossils: GEOLEX link NO cgkn link Double Mountain

Bliss Sandstone

Up to 100 meters of Upper Cambrian and Lower Ordovician sandstone found in Arizona, New Mexico(s) and Texas(w). It overlies older metamorphic or igneous rocks and is overlain by the El Paso Limestone

Fossils: A few ichnofossils and marine invertebrates

Bloomington Formation

Middle Cambrian Shale and limestone found in Idaho and Northern Utah. It overlies the Elkhead Limestone/Blacksmith limestone. It includes two named units -- the Hodges Shale and the Calls Fort Shale as well as several unnamed units.

Fossils: trilobites and brachiopods

Bloomington Lake Dolomite

90 meters of Upper Ordovician dolomite found in Utah and Idaho. It overlies the Deep Lakes Formation and underlies the Tony Grove Lake member of the Laketown Dolomite. It is a member of the Fish Haven Dolomite

Fossils: A few corals

Blowout Mountain

32m Permian sandstone TX(c) | San Angelo fossils: GEOLEX link NO cgkn link Greer/Double Mountain

Bluebell Dolomite

300 meters or more of Upper Ordovician, Silurian, and Devonian dolomite found in Utah. It overlies the Opohonga Limestone and is overlain by the Victoria Quartzite/Gardner Limestone. It is subdivided into the Beecher,Dora, and Noah members. The lower portion is equivalent to the Fish Haven Dolomite

Fossils: sparse fossils adequate for dating.

Bluebird Dolomite

62 meters of Middle Cambrian dolomite found in Utah(c). It overlies the Herkimer Limestone and is overlain by the Cole Canyon dolomite

Fossils: Marine invertebrates

Bluebird Mountain

More than 8 meters of Upper Mississippian and Lower Pennsylvanian Limestone,sandstone,siltstone and quartzite found in Idaho(ec). It overlies the Railroad Canyon formation and is overlain by the Snaky Canyon formation.

Fossils: forams and conodonts

Blueflower

450m Ediacaran rock_types NT Gametrail Risky Selwyn Basin fossils:Inkrylovia,Sekwia,Pternidium;ichnofossils-Gordia,Torrowangea NO GEOLEX link cgkn link Windermere?

Bluepoint Limestone

Roughly 300 meters of fossiliferous grey Pennsylvanian limestone found in Nevada West of the Grand Canyon. It overlies the Rogers Spring Limestone and is overlain by the Callville Limestone

fossils: Marine invertebrates-corals,bryozoa,brachiopods

Bluff Creek Shale

23m Pennsylvanian,Upper sandstone,clay TX(c) Caddo Creek Gunsight fossils:abundant-foraminifers, brachiopods, corals, gastropods, and cephalopods GEOLEX link NO cgkn link Cisco

Bolsa Quartzite

Up to 200 meters of Upper Cambrian quartzite found in Southern Arizona as well as possibly adjacent California and New Mexico. It generally lies on Precambrian basement rocks. It is overlain by the Abrigo Limestone/Martin Limestone

Fossils: A few trilobites from beds near the top of the formation.

Bonanza King Dolomite

As much as 600 meters of Middle and Upper Cambrian dolomite, limestone, and shale found in the Southwestern Great Basin and adjacent Mojave Desert of Arizona, California, Nevada, and Utah.. It overlies the Cadiz Shale/Carrara Formation/Monola Formation and is overlain by the Cornfield Spring Formation/Nopah Formation/Lead Gulch/Dunderberg Shale.

Fossils: A few poorly preserved fossils adequate for dating, Girvanella

Bonner Quartzite

Up to 500 meters of Proterozoic Quartzite found in Idaho, Montana and Washington. It overlies the Mount Shields Formation] and underlies the McNamara Formation. Ascribed to the Missoula Group of the Belt Supergroup

Fossils: None?

Bonnet Plume

1500m? Cretaceous-Paleocene sandstone,shale,lignite YU Road River/? quaternary fossils:pollen NO GEOLEX link cgkn link [http://weblex.nrcan.gc.ca/html/001000/GSCC00053001629.html]

Bonneterre Limestone

152m Cambrian,Upper limestones IL,MN,MO LaMotte/Whetstone Creek Potosi Arbuckle/Eau Claire fossils:marine invertebrates-trilobites GEOLEX link NO cgkn link

Borsato

60 meters of dark Upper Devonian dolomite found in Alberta and British Columbia. It overlies the Hollebeke Formation and is overlain by the Mt Hawk/Southesk Formations

Fossils: Corals, Stromatoporoids, Amphipora

Bosworth

An obsolete term for 610 meters of varicolored Upper Devonian shales and sandstones found in the Northwest Territories. It overlies the Fort Creek Shales and are overlain by Cretaceous beds. The Bosworth beds are now assigned to the Imperial Formation. Some authors have also referred to them as the Carcajou Formation at one time. Not to be confused with the abandoned Cambrian Bosworth Formation/Group found in Alberta/British Columbia.

Fossils: brachiopods, plant fragments

Bosworth Formation/Group/Series

An obsolete term for Cambrian beds in Alberta/British Columbia. Not to be confused with Devonian beds in the Northwest and Yukon terriories that were called Bosworth at one time, but are now assigned to the Imperial Formation.

Fossils: Unknown

Bowman Limestone

90 meters of Middle Cambrian limestones and limey shales found in Toole County Utah where it overlies the Hartmann Limestone and is overlain by the Lynch Dolomite

Fossils: A few trilobites

Brad

69m Pennsylvanian,Upper shale,limestone,sandstone,conglomerate TX(c) Adams Branch limestone/Graford Hog Creek/Caddo Creek Ranger/Ventioner fossils:marine invertebrates,plants GEOLEX link NO cgkn link Canyon

Bragdon

1289m Devonian,Upper-Mississippian slate,quartzite,shale CA(nw) Kennett Baird fossils:None GEOLEX link NO cgkn link

Brandon

21m Silurian,Lower dolomite MB,SK Strathclair Formation Cedar Lake Formation East Arm dolomite,Atikameg Dolomite,Moose Lake dolomite,Fife Lake Formation,Guernsey Formation fossils: NO GEOLEX link cgkn link http://weblex.nrcan.gc.ca/html/001000/GSCC00053001777.html

Brazer Limestone

Up to 2000 meters of fossiliferous Upper Mississippian limestone and dolomite with minor chert nodules found in Idaho,Wyoming and Utah. It overlies the Lodgepole Limestone/Madison Limestone/Milligen Formation and is overlain by the Wells Formation/Wood River Formation/Humbug Formation

Fossils: Corals, brachiopods

Breckenridge Limestone

2m Pennsylvanian limestone,sandstone,shale TX(nc) Speck Mtn/Blach Ranch Chaffin/Harpersville fossils:fusulinids GEOLEX link NO cgkn link Thrifty

Brian Head

294m Eocene-Oligocene,Middle Silt,Limestone,Sandstone,Conglomerate,Ash UT(sw) Wasatch Volcanics equivalent fossils:turtle bones,gastropods [http://ngmdb.usgs.gov/Geolex/Units/BrianHead_7324.html] NO cgkn link

Bright Angel Shale

As much as 200 meters of Middle Cambrian shale with minor sandstone and limestone found in the Grand Canyon of Arizona and adjacent areas of Utah,Nevada,California, and Arizona. It overlies the Tapeats Sandstone and is overlain by the Muav Limestone. It is a member of the Tonto Group and is laterally equivalent to the Carrara Formation/Abrigo Limestone/Cadiz Shale/Pioche Shale

Fossils: brachiopods, trilobites, ichnofossils

Brigham Quartzite

2000 meters or more of Proterozoic,Ediacaran, Lower and Middle Cambrian quartzitic sandstone found in NorthEastern Utah and Idaho. It overlies proterozoic beds/Pocatello Formation/Blackrock Canyon Formation and is overlain by the Langston formation/Elkhead Limestone/Twin Knobs. Various attempts have been made to subdivide the Brigham into members or to replace it entirely. One proposed breakdown in Northern Utah is Papoose Creek Formation, Caddy Canyon Quartzite, Inkom formation, Mutual Formation, Camelback Mountain Quartzite, and Gibson Jack Formation. Another is Kelley Canyon Formation, Caddy Canyon Quartzite, Inkom, Mutual, and Browns Hole formations. Another in Idaho is Kasiska Quartzite, Windy Pass Argillite, and Sedgwick Peak Quartzite.

Fossils: ichnofossils, trilobites and other Middle Cambrian fossils in the uppermost beds.

Briones Sandstone

701m Miocene,Upper sandstone/conglomerate CA(wc) Rodeo San Pablo fossils:abundant GEOLEX link NO cgkn link San Pablo

Broadview

Early Paleozoic (Cambrian?-Devonian?) grit and phyllite found in British Columbia(se). It overlies the Jowett Formation/Sharon Creek Formation and is probably overlain by the Milford Group. It is a member of the Lardeau Group -- a sequence of unfossiliferous clastic sediments found in the Kootenay Terrane whose age is constrained by Lower Cambrian and Mississippian fossils in underlying and overlying beds.

Fossils: None

Broken Skull

860 meters of Upper Cambrian and Lower Ordovician limestone, dolostone and sandstone found in the Yukon and Northwest Territories. It overlies the Rockslide/Avalanche/Sekwi Formations and is overlain by the Sunblood Formation. It is laterally equivalent to the Franklin Mountain/Rabbitkettle Formations.

Fossils: Unknown

Broom Creek Limestone

25 meters of Permian limestone/dolomite with minor shale, anhydrite and sandstone found in North Dakota, Nebraska, South Dakota(sw), Wyoming(se). It overlies the Wendover Group and is overlain by the Cassa Group. It is a member of the Hartville Formation

Fossils: Scarce at best[?]

Brown Creek

73m Pennsylvanian sandstone,clay TX(c) Big Valley Spring Creek fossils: GEOLEX link NO cgkn link Strawn

Browns Hole

Up to 200 meters of precambrian volcanics and quartzite found in Northern Utah. It overlies the Mutual Formation and is overlain by the Geertsen Canyon Formation. It is a member of the Brigham Group

Fossils: None?

Brownwood

76m Pennsylvannian,Upper clay,shale,sandstone TX(c) Rochelle conglomerate Adams Branch limestone fossils:foraminifers,corals,crinoids,brachiopods,echinoids,gastropods,cephalopods,pelecypods GEOLEX link NO cgkn link

Brush Canyon Limestone

Up to 30 meters of Lower Mississippian limestone found in Idaho(se) and Utah(ne). It overlies the Chinese Wall Limestone and is overlain by the Devil Creek Limestone It is a member of the Henderson Canyon Formation

Fossils: Sometimes abundant crinoid debris,corals,gastropods,brachiopods,a few blastoids,starfish, and sparse conodonts

Buck Spring

30m Cambrian,Middle sandstone,siltstone WY(sc) Flathead #Flathead | [Du Noir Gros Ventre/Depass fossils: Trilobites GEOLEX link 7374 NO cgkn link Gros Ventre

Buckskin

875m Triassic sandstone,siltstone,phyllite,conglomerate AZ(wc),CA(se) Kaibab |Vampire Moenkopi Formation fossils: GEOLEX link NO cgkn link

Buffalo Creek

38m Pennsylvanian clay TX(c) Rough Creek Wilbarger Creek fossils:? GEOLEX link NO cgkn link Strawn

Bull Canyon

95m Triassic,Upper mudstone,sandstone,conglomerate NM Trujillo Redonda fossils:vertebrates,invertebrates,microfossils,petrified wood GEOLEX link NO cgkn link Chinle

Bull Creek

23m Pennsylvanian sandstone TX(c) Horse Creek Big Valley fossils: GEOLEX link NO cgkn link Strawn

Bullwagon

11m Permian,Lower dolomite,shale TX(cn) Vale Choza fossils: GEOLEX link NO cgkn link Clear Fork

Bullion Dolomite

Up to 150 meters of Mississippian dolomite found in the region where California, Nevada and Arizona meet. It overlies the Anchor Dolomite and is overlain by the Arrowhead Limestone/Yellowpine Limestone. It is a member of the Monte Christo Formation.

Fossils: sparse

Bull Ridge Member

Up to 40 meters of Mississippian dolomite,sandstone,siltstone, and limestone found in Montana(sc) and Wyoming(c). It overlies the Little Tongue Formation and is overlain by the Darwin Sandstone It is a member of the Mission Canyon Formation/Madison Limestone

Fossils: pelmatozoan debris, ostracods, brachiopods, and coral fossils in upper part of formation.

Bunger

70m Pennsylvanian,Upper sandstone,shale,limestone TX(c) Jacksboro Gunsight fossils:? GEOLEX link NO cgkn link Graham

Burnais

400 meters or less of Middle Devonian gypsum and sedimentary rocks found in British Columbia. It overlies the Cedared Formation and overlain by the Harrogate Formation. is laterally equivalent to the Elk Point Group

Fossils: None?

Burnam Limestone

? Ordovician,Upper Limestone TX(c) Honeycut? Stribling fossils:marine invertebrates GEOLEX link NO cgkn link Ellenburger

Bursum Formation

Up to 75 meters of red or green Lower Permian shale and reworked limestone found in New Mexico(c). It overlies the Panther Seep Formation/Madera Formation/Holder Formation/Percha Shale/Cutter Dolomite and is overlain by the Abo Group/Hueco Formation. It is a member of the Magdalena Group

Fossils: fusulinids

Busby Quartzite

As much as 140 meters of Lower Cambrian shale and quartzite found in North Central Utah. It overlies the Cabin Shale and is overlain by the Abercrombie formation/Shadscale Formation

Fossils: Basically no body fossils. Possibly some ichnofossils.

Butterfield Limestone

765? meters of Middle Pennsylvanian limestones found in Utah(c). It overlies the White Pine Shale and is overlain by the Bingham Mine Formation. It is a member of the Oquirrh Group and is considered by some authors to be part of the Butterfield Peaks Formation.

Fossils: fusulinids,abundant marine invertebrates(?)

Butterfield Peaks Formation

2765 meters of Middle Pennsylvanian Sandstone,quartzite and limestone found in Utah(c). It overlies the West Canyon limestone and includes the Maple, White Pine and Butterfield formations of the Oquirrh Group. It is overlain by the Bingham Mine Formation

Fossils: Abundant marine invertebrates-brachiopods, corals, bryozoans, and fusulinids- in some beds

Caballero

? Mississippian,Lower limestone,marl NM Percha Lake Valley marine invertebrates-conodonts,brachiopods,ammonites GEOLEX link http://ngmdb.usgs.gov/Geolex/NewRefsmry/sumry_7431.html No cgkn link

Cabin Shale

A somewhat obsolete term for up to 170 meters of fossiliferous gray-green-brown Lower Cambrian shale found in NorthWestern Utah. It overlies the Prospect Mountain Quartzite and is overlain by the Busby Quartzite. It is more or less equivalent to the Pioche Shale/Ophir Shale elsewhere in Utah.

Fossils: Occasional trilobites.

Cable Canyon Sandstone

Up to 15 meters of Middle Ordovician sandstone found in New Mexico(s) and Texas(w). It overlies the Bat Cave Formation. And is overlain by the Jornada Formation/Upham Formation. It is a member of the Montoya Group

Fossils: Unknown. May contain marine invertebrates

Cabrillo

171m Cretaceous,Upper sandstone,siltstone,conglomerate CA(sw) Pt Loma Eocene and Pleistocene beds equivalent fossils: GEOLEX link NO cgkn link Rosario

Caddo Creek

46m Pennsylvanian,Upper limestone,shale TX(c) Brad Finis/Bluff Creek/Graham Home Creek,Hog Creek fossils: GEOLEX link NO cgkn link Canyon

CaddyCanyon

1200 meters or more of late Proterozoic tidal flat and subtidal quartzite with minor siltstone found in Central Utah and adjacent idaho. It overlies the Papoose Creek Siltstone/Kelley Canyon Formation. It is overlain by the Inkom formation It is a member of the Brigham Group.

Fossils: None?

Cadiz Shale

Up to 180 meters of brownish Lower and Middle Cambrian shales with minor limestone found in some mountain ranges in the Northeastern Mojave Desert of California. It overlies the Chambless Limestone and is overlain by the Bonanza King Dolomite. It is laterally equivalent in part to portions of the Carrara, Prospect Mountain Quartzite, and Tapeats Sandstone formations to the North and East.

Fossils: Sparse. Occasional trilobites. Others?

Cairn

230 meters of cherty Upper Devonian dolomite and minor limestone found in Alberta and British Columbia. It includes the Flume Formation. It overlies the Souris River/Beaverhill Lake Formations and is overlain by the Perdrix Formation/Southesk Formation. It is laterally equivalent to the Leduc/Cooking Lake/Duperow/Borsato/Hollebeke Formations

Fossils: Amphipora, stromataporoids, corals, a few brachiopods, ostracods, bryozoa, etc

Calico Bluff

610m Mississippian Upper-Pennsylvanian Lower limestone,shale,slate AK(ec) Ford Lake Shale Nation River Formation sometimes abundant marine invertebrates GEOLEX http://ngmdb.usgs.gov/Geolex/NewRefsmry/sumry_4888.html cgkn http://weblex.nrcan.gc.ca/html/002000/GSCC00053002182.html

Calls Fort Shale

60 meters of gray Middle Cambrian limestone and shale found in Northern Utah. It overlies and is overlain by unnamed formations. It is a member of the Bloomington Formation.

Fossils:Unknown - probably few or none

Callville Limestone

Up to 600 meters of fossiliferous dark Early Pennsylvanian limestone and sometimes sandstone found in the area NorthWest of the Grand Canyon in Arizona, Nevada, and Utah. It overlies the Redwall Limestone/Bluepoint Limestone/Rogers Spring Formation and is overlain by the Supai Sandstone/Talisman Quartzite/Pakoon Limestone. It may be in part laterally equivalent to the Supai Sandstone

Fossils: brachiopods, conodonts, fusulinids, corals, algal oncolites

Calmar Formation

10 meters of Upper Devonian dolomite, shales and anhydrite found in central and western Alberta. It overlays the Nisku formation and is overlain by the Graminia Formation. Not to be confused with the Ordovician Calmar bentonite found in the middle west.

Fossils: Unknown - presumably few or none.

Caloso

29m Mississippian limestone,shale,sandstone NM Sandia Madera fossils:Marine invertebrates GEOLEX link NO cgkn link Kelley

Camelback Mountain Quartzite

As much as 1200 meters of marine Ediacaran and Lower Cambrian quartzite found in SouthEast Idaho. It overlies the Mutual Formation and is overlain by the Gibson Jack Formation

Fossils: None

Cameron Creek Formation

70 meters of Lower Pennsylvanian sandstone,shale,and siltstone with minor limestone found in Montana and North Dakota. It overlies the Heath Formation and is overlain by the Alaska Bench Formation. Sometimes considered to be a member of the Tyler Formation. It is a member of the Big Snowy Group/Amsden Group

Fossils: corals, brachiopods, pelecypods, gastropods

Camp Colorado Limestone

8m Permian,Lower limestone,shale TX(c) Salt Creek Bend Watts Creek fossils:marine invertebrates-corals,brachiopods GEOLEX link NO cgkn link Moran/Cisco

Camp Creek Shale

15m Pennsylvanian,Upper-Permian,Lower clay,limestone,sandstone TX Saddle Creek Coon Mountain/Stockwether fossils:marine invertebrates-corals GEOLEX link NO cgkn link Pueblo Not to be confused with the Camp Creek Series in the NW Territories

Campito Formation

Fossiliferous Lower Cambrian shales and quartzites found in the area of the Inyo,White,and Silverpeak ranges in California and Nevada. It consists of upper Montenegro and lower Andrews Mountain members. It overlies the Deep Spring Formation and is overlain by the Poleta Formation. It is part of a thick sequence of Middle Cambrian, Lower Cambrian and late Proterozoic outer shelf sediments with different nomeclature than the corresponding nearer shore sediments found further East. The Campito has a small fauna of very early trilobites.

Fossils: Sparse trilobites-the earliest known from North America.

Camsell

Up to 1940 meters of Lower Devonian limestone breccia, siltstone and anhydrite found in the Northwest Territories. It overlies the Delorme Formationand is overlain by the Sombre/Arnica Formations

Fossils: Unknown

Canol Shale

Up to 120 meters of Upper Devonian black shale found in the NorthWest Territories and Yukon Territory. It overlies the Ramparts Formation/Kee Scarp Formation/Hare Indian Formation/Hume Formation and is overlain by the Imperial Formation.

Fossils: A few microfossils

Canutillo Formation

Up to 50 meters of Upper Devonian limestone,shale,and sandstone found in New Mexico(se) and Texas(w). It overlies the Fusselman Limestone and is overlain by the Helms Formation.

Fossils: Presumably sufficient marine invertebrates to establish dating

Canyon

283m Pennsylvanian,Upper limestone,shale,conglomerate,sandstone TX(c) Strawn Cisco fossils:marine invertebrates GEOLEX link NO cgkn link Canyon

Capitan Limestone

600 meters of Upper Permian limestone and dolomite found in New Mexico(sc) and Texas(w). It overlies the Delaware Mountain Limestone. The formation is overlain by recent deposits if it is overlain at all.

Fossils: corals,brachiopods,crinoid fragments. Poorly preserved in dolomitic beds

Cap Mountain Limestone

67m Cambrian,Middle-Cambrian,Upper Limestone,Sandstone OK,TX(c) Hickory/Reagan Wilberns/Lion Mountain fossils:trilobites GEOLEX link cgkn link There may be a Cambrian Cap Mountain formation in the NT as well

Carbon Ridge

? Permian,Lower limestone NV(ec),UT(wc) Diamond Peak Formation/Ely Newark Canyon | | fossils:conodonts | [GEOLEX link NO cgkn link

Carcajou Formation

Upper Devonian shales and sandstone found in the Northwest and Yukon Territories. It is the same as the previous Bosworth Formation and has been renamed as the Imperial Formation See Imperial Formation

Fossils:

Card Formation

About 100 meters of thin bedded Lower Devonian dolomite found in Utah(n). It overlies the Laketown Formation and is overlain by the Grassy Flat Formation

Fossils: None?

Cariboo Group

5182 meters of heterogeneous Proterozoic and Cambrian sediments found in British Columbia. It includes the Isaac/Cunningham/Yankee Belle /Yanks Peak/Midas/Mural/Dome Creek Formations. It is laterally equivalent to the Miette Group/Gog Group/Tatei-Chetang Formation.

Fossils: Upper Cambrian marine invertebrates

Carmel

198m Jurassic,Middle sandstone,limestone,shale,gypsum AZ(ne),CO,NM,UT,WY Navajo Entrada fossils: abundant marine invertebrates in some beds GEOLEX link NO cgkn link San Rafael

Caney

366m? Mississippian,Upper shale,limestone AR,OK Sycamore/Wapanucka Goddard fossils:conodonts,pelecypods,gastropods,ostracods,goniatites,cephalopods GEOLEX link NO cgkn link

Carrara Shale

Up to 600 meters of Lower and Middle Cambrian limestones and shales found in Southwest Nevada and adjacent California. It overlies the Zabriskie Quartzite and is overlain by the Bonanza King Dolomite. It is laterally equivalent in part to portions of the Latham Shale/Chambless Limestone/Cadiz Shale/Pioche Shale/Bright Angel Shale formations It includes the Eagle Mountain Shale, Thimble Limestone, Echo Shale, Gold Ace Limestone, Pyramid Shale, Red Pass Limestone, Pahrump Hills Shale, Jangle Limestone, and Desert Range Limestone Members

Fossils: Trilobites, brachiopods, Others?

Cash Creek Quartzite

400 meters of (Lower and?) Middle Cambrian quartzite found in Idaho(c). The base is not exposed and the overlying clastics are unnamed.

Fossils: Middle Cambrian trilobites in some shales

Casper

305m Pennsylvanian,middle-Permian,lower limestone,sandstone WY basement/Deadwood/Madison Forelle Amsden,Tensleep fossils:brachiopods,gastropods,ammonites GEOLEX link [http://ngmdb.usgs.gov/Geolex/NewUnits/unit_6988.html] NO cgkn link

Cassa

100 meters of Permian shale, sandstones and evaporites found in Nebraska, North Dakota, South Dakota(sw), and Wyoming(SE). It overlies the Broom Creek Formation/Meek Formation/Wendover Formation/Hayden Formation and is overlain by the Opeche Shale. It includes the Owl Canyon Formation and Lyons Sandstone It is a member of the Hartville Formation

Fossils: Few? None?

Castle Reef Limestone

Up to 150m of Mississippian dolomite/limestone found in Montana(w). It overlies the Allan Mountain Limestone. It is overlain by the Ellis Group. It is a member of the Madison Group

Fossils: corals,brachiopods,bryozoa

Cathedral Formation

Up to 610 meters of Middle Cambrian limestone, dolomite and dolomitic mudstone found in Alberta and British Columbia. It overlies the Mount Whyte/Naiset formations/Gog Group and is overlain by the Stephen Formation. It is laterally equivalent to parts of the Mount Whyte/Earlie Formation/Gordon Shale/Elko Formation/Ross Lake Shale/Snake Indian Formation

Fossils: Stromatolites, marine invertebrates in some beds.

Cave Creek

15m Permian,Lower gypsum,shale,dolomite KS,OK underlaying overlying Blaine fossils: GEOLEX link NO cgkn link

Cayuma

200m Pleistocene? sand,gravel,clay CA(w) Morales fossils: None NO GEOLEX link NO cgkn link

Ceasar Canyon Limestone

Middle Ordovician limestones found in central Nevada above the Antelope Valley Limestone in the Toquima Range

Fossils: Trilobites

Cedar Hills

23m Permian,Lower sandstone KS,NE,OK FlowerPot fossils: GEOLEX link NO cgkn link Salt Fork/Nippewalla

Cedar Lake Formation

Up to 100 meters of Silurian dolomites found in Montana,North Dakota(nw),Saskatchewan and Manitoba It overlies the East Arm Formation and is overlain by the Ashern Formation/Taylorton Formation. It is a member of the Interlake Group

Fossils: poorly preserved stromatoporoids, corals, crinoids, bryozoans, brachiopods, mollusks in some beds.

Cedar Mesa

152m Permian,Lower sandstone AZ(ne),CO(sw),NM(nw),UT(se) Halgaito Organ Rock Cutler,Supai,Hermit fossils: fusulinids GEOLEX http://ngmdb.usgs.gov/Geolex/Units/CedarMesa_7022.html NO cgkn link Cutler

Cedared

Middle Devonian limestone with sand and silt inclusions found in British Columbia. It overlies the Beaverfoot/Tegart Formations and is overlain by the Harrogate Formation/Burnais Formation. It is laterally equivalent to the Elk Point Group.

Fossils: a few ostracods, gastropods, brachiopods.

Cedar Breaks

581m Paleocene-Eocene limestone,sandstone,conglomerate UT(sc) Kaiparowits/North Horn Brian Head /Green River Claron,Flagstaff,Wasatch fossils:None? GEOLEX link NO cgkn link

Cedarton Shale

27m Pennsylvanian,Upper shale,conglomerate,sandstone TX(c) Adams Branch limestone Clear Creek fossils:marine invertebrates-corals,brachiopods,gastropods,cephalopods,pelecypods GEOLEX link NO cgkn link Canyon

Chaffee Formation

About 50 meters of Upper Devonian and Lower Mississippian sandstone, shale, limestone and dolomite found in Colorado(c). It overlies the Manitou Limestone/Dotsero Formation/Peerless Formation/Harding Formation and is overlain by the Leadville Limestone. It includes the Parting Sandstone, Dyer Dolomite, and Gilman Sandstone

Fossils: Brachiopods, fish plates

Chaffin Limestone

18m Pennsylvanian,Upper clay,limestone,sandstone,coal TX(c) Parks Mountain Harpersville fossils:foraminifers,echinoderms,bryozoans,brachiopods,pelecypods,gastropods GEOLEX link NO cgkn link Cisco/Thrifty

Chambless Limestone

10 meters of oncolitic Lower Cambrian Limestone interbedded with fossiliferous red siltstones found in the Northeastern Mojave Desert of California. It overlies the Latham Shale and is overlain by the Cadiz Shale. It is laterally equivalent in part to portions of the Carrara, Prospect Mountain Quartzite, and Tapeats Sandstone formations to the North and East.

Fossils: Olenellid trilobites,with abundant inarticulate brachiopods and hyolithids in the mudstones. Algal oncolites

Chainman Shale

Up to 1200 meters of Uppermost Devonian and Mississippian fissile black shale with minor limestone found in California, Nevada and Utah. In some areas is mapped with the Diamond Peak Formation It overlies the Perdido Formation/Peers Spring/Monte Cristo Limestone/Joana Limestone and is overlain by Ely Limestone

Fossils: Cephalopods, plants, corals, brachiopods fish teeth at some locations.

Chancellor Shale

Up to 2000 meters of Middle and Upper Cambrian limestone, shale, slate, and dolomite found in Alberta and British Columbia. It overlies the Stephen Shale/Eldon Formation and is overlain by the Ottertail Formation. It is laterally equivalent to the Eldon/Pika/Arctomys/Sullivan Formation.

Fossils: Trilobites sufficient for dating in a few beds.

Chandler

1433m Cretaceous sandstone,conglomerate,coal AK(n) Prince Creek Colville Nanushuk fossils:marine invertebrates(Inoceramus) GEOLEX link NO cgkn link Abandoned. Not to bew confused with the Chandler Formation in Quebec

Chappel Limestone

2m? Mississippian,Lower limestone TX(c) Ellenburger Barnett/Marble Falls fossils:crinoidal fragments GEOLEX link NO cgkn link

Charles Formation

Around 200 meters of subsurface Mississippian earthy limestones, shales, dolomites, and anhydrites found in Montana(e), North Dakota(w), South Dakota(w) and Saskatchewan. It overlies the Madison Limestone/Mission Canyon Formatin/Spearfish Formation and is overlain by the Kibbey Formation. It is a member of the Big Snowy Group/Madison Limestone.

Fossils: corals, brachiopods, others?

Chase

102m Permian,Lower limestone,flint,shale KS,NE,OK Neosho Marion fossils:brachiopods,bivalves GEOLEX link NO cgkn link

Chedabucto Lake

76meters Upper Ordovician dolomites and chert Northwest Territories preCambrian beds/La Martre Falls Formation Chinchaga Formation Mirage Point Formation Colonial corals,brachiopods,trilobites,graptolites NO GEOLEX link cgkn http://weblex.nrcan.gc.ca/html/002000/GSCC00053002814.html

Cherokee Shale

230m Pennsylvanian,Middle shale,coal,sandstone,limestone IA,KS,MO,NE,OK,TX Galena Mouse Creek,Oswego,(Swallow) fossils:None? GEOLEX link NO cgkn link Cherokee

Chetang Formation

397 meters of Middle Cambrian siltstone found in Alberta and British Columbia. It overlies the Hota Formation and is overlain by carbonate rocks.

Fossils: None?

Chickasha

53m Permian,Lower sandstone,shale OK(se) Duncan Blaine fossils: GEOLEX link NO cgkn link El Reno

Chico

1981m+ Cretaceous,Upper shale,sandstone,conglomerate CA(ec) volcanics Red Bluff volcanics fossils:marine invertebrates,a few terrestrial vertebrates NO GEOLEX link NO cgkn link Chico No Geolex entry for the formation, but entries for some members

Chico Ridge Limestone

? Pennsylvanian,Upper rocks TX(nc) Lake Bridgeport Brad fossils: GEOLEX link NO cgkn link Graford

Chinchaga Formation

76 meters of Upper Devonian dolomite and evaporites found in Alberta, British Columbia, and Northwest Territories. It overlies precambrian rocks/Lower Devonian red beds/Cold Lake Formation. It is overlain by the Headless/Keg River/Little Buffalo/Lonely Bay/Pine Point Formations. It is laterally equivalent to the Contact Rapids/Ashern/Landry/Manetoe/Nahanni Formations.

Fossils: None

Chinese Wall Limestone

Up to 30 meters of Lower Mississippian limestone found in Idaho(se) and Utah(ne). It overlies the [Beirdneau Formation] and is overlain by the Brush Canyon Limestone It is a member of the Henderson Canyon Formation

Fossils: Sometimes abundant crinoid debris,corals,gastropods,brachiopods, and sparse conodonts

Chinle

360m Triassic,Upper sandstone,shale,gypsum,limestone AZ(n),CO(w),NV,NM,SK,TX,UT La Plata/Shinarump/Wingate/Santa Rosa/Cutler/Yeso/San Andreas/Moenkopi Shinarump/Naranjo/Moenave fossils:petrified wood,vertebrates GEOLEX link http://ngmdb.usgs.gov/Geolex/NewRefsmry/sumry_4997.html No cgkn link

Chino Valley Formation

Heterogeneous (sandstone, conglomerate, etc), unfossiliferous, probably Devonian, sediments found in Western Arizona. The Chino Valley beds overlie the Tapeats Quartzite and underlie the Martin Formation

Fossils: None?

Chiricahua Limestone

About 250 meters of Permian limestone found in Arizona(se) and New Mexico. An alternate name for the Concha Limestone It overlies the Snyder Hill Formation/Scherrer Formation

Fossils: Marine invertebrates

Chisholm Shale

Up to 60 meters of fossiliferous early Middle Cambrian shale found in central Nevada and Western Utah. It overlies the Lyndon Limestone and is overlain by the Highland Peak Limestone.

Fossils: Trilobites

Chiulos Formation

Upper Mississippian limestone, shale, and sandstone found in Utah(c) It overlies the Paymaster Formation and is overlain by the Poker Knoll limestone It is a member of the Great Blue Limestone.

Fossils: plants, brachiopods

Chokecherry Dolomite

Up to 300 meters of Upper Cambrian/Lower Ordovician dolomite with some conglomerate and chert found in northwest Utah. It overlies the Hicks Formation and underlies the Fish Haven Dolomite.

Fossils: a few early Ordovician gastropods.

Choza

265m Permian,Lower shale,sandstone,dolomite TX(c) Bullwagon San Angelo fossils:present GEOLEX link NO cgkn link Clear Fork

Chuar Group

Up to 1900 meters of late proterozoic limestone, shale, redbeds, evaporites, etc exposed in the Grand Canyon of Arizona and in some tributary canyons. It overlies the Nankoweap Group and is overlain unconformally by the Tapeats Sandstone

Fossils: Stromatolites, discoid carbonaceous fossils, microfossils

Chugwater

381m Triassic sandstone,shale,gypsum CO(ne),MT,WY Tensleep/Forelle/Sundance/Dinwoody Dinwoody/Nugget/Gypsum Spring Wyoming fossils-sparse GEOLEX link http://ngmdb.usgs.gov/Geolex/UnitRefs/ChugwaterRefs_7498.html No cgkn link

Church Rock

122m Triassic,Upper siltstone,sandstone UT(se),AZ(ne) Owl Rock/Moss Back/Moenkopi Wingate Rock Point fossils:arthropod tracks GEOLEX link NO cgkn link Chinle

Chushina

? Ordovician ? AB,BC ? ? Survey Peak fossils:? NO GEOLEX link NO cgkn link

Cierbo

397m Miocene,Upper sandstone,conglomerate WC(wc) Briones Santa Margarita fossils:sparse marine inverbebrates GEOLEX link NO cgkn link San Pablo

Cimarron

381m Permian,Lower shale,sandstone,dolomite KS Big Blue Cretaceous fossils:uncommon GEOLEX link NO cgkn link Cimarron

Cisco

256m Pennsylvanian,Upper-Permian,Lower clay,shale,limestone,coal OK(s),NM?,TX(nc) Brownwood/Ranger Coleman/Albany fossils:present GEOLEX link NO cgkn link

Claremont Shale

? Miocene shale CA(wc) ? Oursan(?) fossils:? GEOLEX link NO cgkn link Monterey

Clarno

640m Eocene-Oligocene tuff,shale,ash,lava OR(c) Chico John Day fossils:plants(adundant),vertebrates GEOLEX link NO cgkn link

Claron

305m Paleocen-Oligocene Limestone,Sandstone,Conglomerate NV,UT(sw) Iron Springs/Kaiparowits volcanics equivalent fossils:gastropods(uncommon),vertebrates(very uncommon) GEOLEX link cgkn link

Clausen Shale

172 meters of Lower Mississippian thin black shales and siltstones found in a small area of British Columbia and the Yukon Territory. It overlies the Yohin Formation and is overlain by the Flett Formation. It is laterally equivalent to the Besa River Shale/Etanda Formation/Banff Limestone

Fossils: Marine invertebrates?

Clayton Mine Quartzite

600 meters of Middle Ordovician or older quartzite and pebble conglomerate found in Central Idaho. It is overlain by the Ella Dolomite

Fossils: None

Clear Creek Limestone

43m Pennsylvanian limestone/clay TC(nc) Cedarton Placid Shale fossils:corals,echinoids,brachiopods GEOLEX link cgkn link Canyon Not to be confused with the Clear Creek LImestone/Chert of IL,KY,MO

Clear Fork Group

? Permian,Lower limestone,clay,sandstone TX(c) Wichita Double Mountain fossils:vertebrates,marine invertebrates(?) GEOLEX link NO cgkn link Clear Fork

Clemis

An obsolete term for beds now assigned to the upper Mount Cap Formation.
60m Cambrian black petroliferous shale,(minor limestone and sandstone) Northwest Territories(W) Alder Sanguine Mount Cap fossils: Trilobites?, others? NO GEOLEX Entry cgkn http://weblex.nrcan.gc.ca/html/003000/GSCC00053003039.html

Clinetop Limestone

Up to 3 meters of massive Upper Cambian algal limestone found in Colorado(c). It overlies the Glenwood Canyon Formation and underlies the Manitou formation. It is a member of the Dotsero Formation

Fossils: stromatolites-Collenia,Cryptozoon, invertebrate fragments

Clinker Sandstone

600 meters of Lower Permian sandstone found in Utah(c). It overlies the Curry Peak formation and is overlain by the Freeman Peak formation

Fossils: fusulinids in chert.

Cloud Chief

35m Permian,Middle gypsum,clay OK(se),TX(n) Day Creek Quartermaster fossils: GEOLEX link NO cgkn link

Clyde Mountain

145m Permian,Lower limestone,shale,marl TX(c) Belle Plains Lueders fossils:? GEOLEX link http://ngmdb.usgs.gov/Geolex/Units/Clyde_7547.html | NO cgkn link | [Wichita

Coal Canyon

450m Paleocene-Eocene sandstone,conglomerate,limestone CA(sw) Tuna Canyon
Llajas Martinez fossils:marine invertebrates GEOLEX link NO cgkn link

Coconino Sandstone

Up to 200 meters of Lower Permian pure quartz sandstone or quartzite found in California, Nevada, Arizona and Utah. It overlies the Supai Formation and is overlain by the Kaibab Limestone/Toroweap Formation/Hermit Shale. It is a member of the Aubrey Group . Fossils: trackways and burrows

Cold Lake Formation

Up to 117m of Upper Devonian salt and shale found in Alberta,British Columbia,the Northwest Territories,and Saskatchewan. It overlies the Ernestina Lake Formation and is overlain by the Contact Rapids/Chinchaga Formations. It is laterally equivalent to the Elk Point Group/Ernestina Lake/Mirage Point/Bear Rock/Arnica/Gossage/Cedared/Burnais Formations.

Fossils: None?

Cole Canyon Dolomite

275 meters of Middle Cambrian limestone and dolomite found in Utah(c). It overlies the Bluebird Dolomite and is overlain by the Opex Limestone

Fossils: Trilobites, brachiopods

Coleman

30m Permian limestone,shale,clays,sandstones TX(c) Waldrip Wichita Wichita fossils: GEOLEX link NO cgkn link

Colina Limestone

Up to 200 meters of dense, black, Lower Permian limestone found in Arizona(se) and New Mexico(sw). It overlies the Earp Formation and is overlain by the Epitaph Dolomite/Scherrer Formation. Laterally equivalent to the Fort Apache Limestone. Part of the Naco Group

Fossils: diverse, but not necessarily abundant - brachiopods, gastropods, echinoid spines, scaphopods, fusulinids, corals, and bryozoa

Colony Creek Shale

18m Pennsylvanian,Upper shale,sandstone TX(c) Ranger Home Creek fossils: GEOLEX link NO cgkn link Canyon

Colton

1036m Paleocene-Eocene,Lower sandstone,shale UT(ec) Flagstaff Green River Green River fossils: GEOLEX link NO cgkn link

Colville

1585m Cretaceous,Upper silt,slate,shale,limestone,coal AK(nw) Nanushuk Gubik fossils:some GEOLEX link cgkn link Colville obsolete in AK. May be used in BC

Comanche Creek

91m Pennsylvanian sandstone,clay TX(c) Wilbarger Creek Antelope Creek fossils:? GEOLEX link NO cgkn link Strawn

Comet Shale

Lower and/or Middle Cambrian shale and limestone found in Nevada(ec). It overlies the Pioche Shale It was originally considered to be a member of the Pioche Formation

Fossils: diverse Marine invertebrates including soft bodied animals

Concha

Up to 223 meters of Permian sandstone, limestone, and chert found in Arizona(se) and New Mexico(se). It overlies the Scherrer formation and is overlain by the Rainvalley Formation/Mesozoic volcanics/Cretaceous Glance Conglomerate. It is a member of the Naco Group/Snyder Hill Group

Fossils: Corals, horn corals, brachiopods, gastropods, bryozoa, sponges, echinoid spines, crinoid stems, scaphopods, bivalves, ammonoids, and fusulinids

Conover Ranch

33 meters of Upper Mississippian and Lower Pennsylvanian sandstone,siltstone,conglomerate,claystone found in Montana(sw). It overlies the Lombard Formation. It is a member of the Snowcrest Group. It is equivalent to the Bluebird Mountain Formation and Alaska Bench Formation

Fossils: Corals, brachiopods, forams

Contact Rapids

49 meters of Middle Devonian dolomite and dolomitic shale found in Alberta and Saskatchewan. It overlies the Cold Lake Formation and is overlain by the Winnipegosis/Keg River Formations. It is laterally equivalent to the Chinchaga/Willow Lake/Bear Rock/Nahanni/Headless/Manetoe/Landry/Cedared/Mount Forster formations.

Fossils: Unknown

Cooking Lake

90 meters of Upper Devonian limestone. dolomite and shale found in Alberta(ec) It overlies the Beaverhill Lake Formation and is overlain, by the Leduc Formation/Duvernay Formation.

Fossils: Stromatolites - a few crinoids and brachiopods

Coon Mountain Sandstone

23m Pennsylvanian,Upper sandstone,conglomerate TX Camp Creek Stockwether fossils:? GEOLEX link cgkn link Pueblo

Coopers Lake Limestone

Up to 150 meters of Middle to Upper Devonian limestones found in Montana. It overlies the Glenn Creek Shale and underlies the Lone Butte Limestone. It is the middle member of the Jefferson Limestone

Fossils: fairly abundant brachiopods, corals, stromatoporoids in some beds

Copenhagen Formation

Middle/Upper Ordovician siltstones(?) found in central Nevada above the Antelope Valley Limestone It is overlain by the Eureka Quartzite

Fossils: Trilobites, brachiopods, graptolites

Coppercap Mountain

500m Proterozoic,Upper limestone,dolostone,shale,evaporites NT(w) Redstone River Sayunei fossils:stromatolites NO GEOLEX link cgkn link http://weblex.nrcan.gc.ca/html/003000/GSCC00053003344.html

Corral Creek Formation

At least 300 meters of Late Proterozoic slate,siltstone and sandstone found in Alberta and British Columbia. It is overlain by the Hector Formation/Gog Group

Fossils: None

Cornfield Spring Formation

An obsolete synonym for some exposures of the Upper Cambrian Nopah Formation.

Fossils: brachiopods, trilobites

Costigan Formation

Up to 125 meters of Devonian limestone and dolomite found in Alberta in the Canadian Rockies. It overlies the Morro Formation and is overlain by the Exshaw Formation.

Fossils: Marine invertebrates-brachiopods

Cottonwood Canyon Member

Up to 25 meters of dirty Upper Devonian and Lower Mississippian limestone and dolomite found in Montana(s),Utah,and Wyoming(nw). It overlies the Bakken Formation/Paine Formation/Exshaw Formation/Leatham Formation/Sappington Formation and is overlain by the Henderson Canyon Formation It is a member of the Lodgepole Limestone/Madison Limestone Not to be confused with the Cottonwood Canyon Coal of New Mexico

Fossils: Conodonts, fish teeth, bones.

Cottonwood Creek

91m Pennsylvanian sandstone TX(c) Spring Creek Hanna Valley fossils: GEOLEX link NO cgkn link Strawn

Cove Fort

Up to 50 meters of creamy Upper? Devonian quartzite found in South Central Utah where it overlies the Simonson Dolomite/Guilmette Formation and is overlain by the Redwall Limestone/Crystal Pass Limestone

Fossils: Ichnofossils?

Cranbrook Formation

500 meters of Lower Cambrian quartzite found in British Columbia. It overlies the Purcell Group/Horsethief Creek Formation and is overlain by the Eager Formation

Fossils: None?

Crowfoot Formation

38 meters of Upper Devonian Anhydrite, dolomite and siltstone found in Southern Alberta. It overlies the Southesk Formation and is overlain by the Stettler Formation. It is laterally equivalent to parts of the Calmar, Graminia, Nisku, Torquay Formations.

Fossils: None?

Crystal Pass

About 90 meters of Upper Devonian/Lower Mississippian Limestone found in Arizona and Nevada. It overlies the Ironside Formation and is overlain by the Cove Fort Quartzite. It is the uppermost member of the Sultan Limestone.

Fossils: forams

Crystal Peak Dolomite

Up to 30 meters of Middle Ordovician sandstone, shale and dolomite found in West Central UT and possibly NV where it overlies the Swan Peak Sandstone/Watson Ranch Quartzite and is overlain by the Eureka Quartzite Not to be confused with the Crystal Peak formation within the Earn Group in the Yukon

Fossils: corals, cephalopods

Crystal Peak Yukon

4370 meters of Mississippian and older conglomerate with minor quartzite found in the Yukon Territory. It overlies unnamed older rocks and is overlain by the Kalzas Formation. It is a member of the Earn Group Not to be confused with the Ordovician Crystal Peak Dolomite found in Utah and Nevada.

Fossils: Unknown

Crystal Spring

800 meters or more of heterogeneous Upper Proterozoic marine conglomerate, shales, sandstone, and limestone exposed in the area around Kingston Peak in SouthEastern California. It overlies unnamed granites and gneises and is overlain by the Beck Spring. It is the basal member of the Pahrump Group.

Fossils: vase shaped microfossils

Cub Shale

A dark colored Middle Cambrian claystone found in Idaho(SE). It is a tounge of the Lead Bell Shale. It overlies the Twin Knobs Formation and is overlain be the High Creek Limestone

Fossils: None?

Cunningham

55 meters of Proterozoic marine limestones,dolostones,shales,sandstones found in British Columbia. It overlies the Isaac Formation and is overlain by the Yankee Belle Formation

Fossils: None?

Curry Formation

Older name for Curry Peak Formation

Curry Peak Formation

850 meters of Permian heterogeneous mostly detrial marine sediments found in Utah(c). It overlies the Oquirrh Formation #Oquirrh] and is overlain by the Clinker formation/Freeman Peak Formation

Fossils: Pennsylvanian marine invertebrates in basal conglomerates, sparse Permian marine invertebrates higher in formation. Ichnofossils

Cutler Formation

As much as 2700 meters of red Lower Permian grit, conglomerate, sandstone, shale and limestone found in Arizona,Colorado(sw),New Mexico(nw), and Utah(se). It overlies the Rico Formation/Hermosa Formation and is overlain by the Telluride Conglomerate/Moenkopi Formation. It is laterally equivalent to the Supai, Coconino, and Kaibab Formations as well as the Yeso Formation.

Fossils: Largely unfossiliferous. Marine invertebrates found in (lower beds?) some areas

Cutter Dolomite

Up to 70 meters of Upper Ordovician dolomite and limestone with some claystone found in New Mexico and Texas It overlies the Aleman Formation and is overlain by the Fusselman Formation/Percha Shale

Fossils: abundant brachiopod fragments in many exposures

Dagmar Limestone

22 meters of Middle Cambrian limestone and thin bedded dolomite found in Utah(c). It overlies the Teutonic Limestone and is overlain by the Herkimer Limestone

Fossils: None

Damnation Limestone

Up to 40 meters of thin bedded Middle Cambrian limestone found in Montana(nw). It overlies the Wolsey shale/Gordon Shale and underlies the Nannie Basin limestone/Dearborn Limestone

Fossils: Trilobites, sponge spicules

Darby Formation

Up to 267 meters of Upper Devonian and Lower Mississippian dolomite,limestone,shale,and siltstone found in Idaho(e) and Wyoming(w) It overlies the Leigh Dolomite/Bighorn Dolomite and is overlain by the Madison limestone/Brazer Limestone

Fossils: a few poorly preserved fossils (brachiopods, bryozoans, corals), conodonts, fish remains in channel deposits in a few localities.

Darwin Sandstone

60 meters or more of Upper Mississippian and Lower Pennsylvannian sandstone found in Montana and Wyoming. It overlies the Madison Limestone and is overlain by the Horseshoe Shale. It is a member of the Amsden Formation/Hartville Formation

Fossils: Mostly unfossiliferous -- a few gastropods and crinoids.

Davis

30m Cambrian,Upper shale,limestone,dolomite IL,IN,KS.MN.MO,OK Whetstone Creek fossils: GEOLEX link| NO cgkn link Franconia Sandstone

Davis Spring Formation

125 meters of Lower Mississippian shale and chert found in Nevada(c). It overlies the Fenstermaker Wash Formation and underlies the Kinkead Spring Limestone

Fossils: dated from Conodonts

Dawn Limestone

Up to 120 meters of fossiliferous Lower Mississippian limestone and dolomite found in the area where California, Nevada, and Arizona meet. It is a member of the Monte Cristo Formation. It overlies the Crystal Pass Limestone and is overlain by the Anchor Limestone.

Fossils: abundant corals, brachiopods

Dawson Bay

Roughly 50 meters of Middle Devonian shale, limestone, dolomite and anhydrite found mostly subsurface in Manitoba, Montana, North Dakota, Saskatchewan, and South Dakota. It overlies the Elk Point Group and is overlain by the Souris River Formation

Fossils: Crinoids, Brachiopods

Day Creek

4m Permian. Middle dolomite,shale CO,KS,NE Whitehorse(Red Bluff) Hackberry/Quartermaster/Taloga Lykins Formation fossils: GEOLEX link| NO cgkn link

DeChelly

122m Permian,Lower sandstone AZ(ne),CO(sw),NM(nw),UT(se) Cutler/Moenkopi/Supai/Organ Rock/Abo Shinarump/Chinle Cutler fossils:None? GEOLEX link No cgkn link Cutler

Dead End

Fossils:
46m Cambrian,Lower nodular brown shale Northwest Territoties(w) Katherine Group Echo Canyon none NO GEOLEX ENTRY cgkn link

Deadman Limestone

46m Triasssic,Upper limestone,shale,chedrt ID(se),WY(wc) Ankareh/Higham grit Wood Shale Ankareh fossils:? GEOLEX link http://ngmdb.usgs.gov/Geolex/Units/Deadman_7861.html NO cgkn link

Deadman Spring Limestone

51 meters of Middle Ordovician sandy dolomite found in Western Utah Nevada. It overlies the Juab Limestone and is overlain by the Eureka Quartzite. It interfingers laterally with the Kanosh Shale. It is a member of the Pogonip Group

Fossils: sparse at best?

Deadmans Gulch

27 meters of Upper Cambrian dolomite and sandstone found in Colorado(c). It overlies the overlies Peerless Formation and is overlain by the Manitou Limestone

Fossils: None?

Deadwood Formation

Up to 300 meters of red brown Middle Cambrian to Lower Ordovician sandstone, quartzite, and conglomerate/shale,and very monor limestone. Found in a continuous exposure around the Black Hills in Montana, Wyoming, North Dakota and South Dakota as well as in mountainous areas further west. It overlies intrusive rocks and is overlain by the Whitewood Formation/Bighorn Dolomite/Winnipeg Sandstone. Laterally equivalent to the Flathead Sandstone/Dry Creek Shale/Aladdin Sandstone/Emerson Formation

Fossils: Middle and Upper Cambrian as well as a few Lower Ordovician invertebrates (brachiopods, trilobites, ammonoids)) at a few localities. Ichnofossils-abundant Scolithos in a thick sandstone section near the top of the unit at many exposures.

Dean Lake Chert

14 meters of fossiliferous Lower Mississippian limestone and chert found in Montana(w) It overlies the Saypo Limestone and is overlain by the Rooney Chert. It is a member of the Madison Limestone

Fossils: brachiopod fragments, crinoid columnals

Dearborn Limestone

Up to 140 meters of Middle Cambrian limestone and shale found in Montana(nw). It overlies the Nannie Basin limestone/Damnation limestone and underlies the Steamboat limestone/Pagoda Limestone

Fossils: trilobites, brachiopods

Death Canyon Limestone

67m Cambrian,Middle limestone,sandstone WY(sw) Wolsey Park Shale Buck Spring/Gros Ventre fossils:sparse trilobites,ichnofossils GEOLEX link http://ngmdb.usgs.gov/Geolex/NewRefsmry/sumry_7867.html NO cgkn link Gros Ventre

Debolt

366m of Upper Mississippian limestone/dolomite grading northward into shale found in Alberta(n) and British Columbia(ne). It overlies the Shunda Formation and is overlain by the Golata Formation/various Permian and Mesozoic rocks. It is laterally equivalent to parts of the Prophet/Flett/Turner Valley Formations

Fossils: Marine invertebrates

Deep Lakes Formation

About 30 meters of thick bedded Upper Ordovician dolomite found in Idaho and Utah. It overlies the Paris Peak Formation and is overlain by the Bloomington Lake Formation. It is a member of the Fish Haven Dolomite

Fossils: a few corals

Deep Spring Formation

Up to 572 meters of Lower Cambrian/Ediacaran shales, limestones, dolomites and quartzites found in the area of the Inyo,White,and Silverpeak ranges in California and Nevada. It overlies the Reed Dolomite and is overlain by the Campito Formation. It is part of a thick sequence of Middle Cambrian, Lower Cambrian and late Proterozoic outer shelf sediments with different nomeclature than the corresponding nearer shore sediments found further East.

Fossils: Ichnofossils, stromatolites, a few Ediacaran body fossils(?), small tubular or conical fossils - Wyattia

Deer Creek

An obsolete term for up to 380 meters of heterogeneous marine sediments found in Colorado(sw). It overlies the precambrian metamorphics/Kerber Formation and is overlain by the Madera Formation. Not to be confused with the Deer Creek limestone found in Iowa, Kansas, Missouri,Nebraska, and Oklahoma

Fossils: marine invertebrates in the limestone beds

Delaware Mountain Formation

Up to 750 meters of Permian Sandstone and Limestone with minor shale found in New Mexico(e) and Texas(w). It overlies the Hueco Formation. It is overlain by the Capitan Limestone It is a member of the Guadaloupe Group

Fossils: Marine fossils present

Delorme Formation

1000 meters of Silurian and Devonian dolomites, limestones and shales found in the Northwest Territories. It overlies the Whittaker Formation and is overlain by the Camsell/Sombre/Arnica formations. It is laterally equivalent to the Bear Rock/Road River formations. It is sometimes considered to be a Group including underlying and overlying formations.

Fossils: Marine invertebrates - brachiopods, trilobites, fish, etc

Denay Formation

More that 300 meters of Middle Devonian Limestone found in Nevada(ec). It overlies the McColley Canyon Formation/Fenstermaker Wash and is overlain by the Devils Gate limestone. Not to be confused with the Denay Limestone member of the Francis formation in Oklahoma.

Fossils: Abundant brachiopods in some beds

Depass

Up to 191 meters of Middle Cambrian sandstone, shale and limestone found in Wyoming. It overlies PreCambrian granites and is overlain by the Gallatin Formation

Fossils: Trilobites, ichnofossils

Deseret Limestone

210 meters of Early Mississippian limestones and shales between two phosphatic beds. It is found in Nevada and Utah. It overlies the Madison Limestone and is overlain by the Humbug Formation. It is laterally equivilent to the Brazer Limestone and possibly the Chainman Shale. Portions in Utah were originally designated as the Pine Canyon Limestone.

Fossils: brachiopods, bryozoa in some beds

Desert Range Limestone

20 meters of Middle Cambrian limestone found in Death Valley and adjacent Nevada. It overlies the Jangle Limestone and is overlain Bonanza King Formation. It is a member of the Carrara Formation and is laterally equivalent to parts of the Cadiz Shale and [Pioche].

Fossils: trilobites-Glossopleura

Devil Creek Limestone

30 meters of grey Lower Mississippian limestone and dolomite found in Idaho(se) and Utah(ne). It overlies the Brush Canyon Limestone and is overlain by the Monroe Canyon Formation It is a member of the Henderson Canyon Formation

Fossils: Sometimes abundant in the limestones - crinoid debris,corals,a few gastropods,brachiopods, and sparse conodonts

Devils Den Limestone

14m Pennsylvanian,Upper limestone,sandstone TX(ne) Jasper Creek Brad fossils:brachiopods,crinoids GEOLEX link cgkn link Canyon

Devils Gate Limestone

630 meters of Middle and Upper Devonian limestone found in Nevada(nc). It overlies the Nevada Formation and is over lain by the Diamond Peak Quartzite/Pilot Shale

Fossils: trilobites, brachiopods

Devils Glen Dolomite

Over 200 meters of Upper Cambrian dolomite found in Montana(nw). Overlies the Switchback Limestone and is overlain by the White Ridge Limestone.

Fossils: Uncommon. Trilobites in some beds at some localities.

Devils Pocket Formation

45 meters of Middle Pennsylvanian dolomite, limestone and sandstone found in Montana. It overlies the Alaska Bench Formation and is overlain by the Quadrant Formation. A member of the Amsden Group/Big Snowy Group

Fossils: Some brachiopods and fusulinids

Devilwater Shale

61m Miocene siltstone CA(cw) Gould shale McDonald shale fossils: ? GEOLEX link NO cgkn link Monterey

Diaber Group

310m Triassic,Middle shales,siltstones AB(nw),BC(ne) Montney Doig/Halfway Toad-Grayling fossils:marine invertebrates NO GEOLEX link cgkn link

Diamond Creek Sandstone

300 meters of Lower Permian sandstone found in Utah(c). It overlies the Kirkman Formation/Furner Valley and is overlain by the Park City Formation

Fossils: None?

Diamond Peak Quartzite

1000 meters or more of massive gray and brown Mississippian and Lower Pennsylvanian quartzite found in central Nevada with overlaps into adjacent California and Utah. It overlies the Chainman Shale/Peers Spring Formation/White Pine Shale and is overlain by the Ely Limestone/Bird Spring Limestone. It is laterally equivalent to the Scotty Wash Sandstone

Fossils: Unclear. Probably uncommon at best.

Diana Limestone

Middle/Upper Ordovician limestones found in central Nevada above the Antelope Valley Limestone and below the Masket Shale

Fossils: Trilobites, graptolites, conodonts

Dinwoody

215m Permian-Triassic,Lower shale,limestone ID(se),MT(sw),UT(n),WY(w) Park City Chugwater Thaynes,Woodside fossils:marine invertebrates in some beds GEOLEX link No cgkn link

Dodo

300 meters of Cambrian shale,limestone with some sandstone,gypsum and dolomite found in the Northwest Territories. It overlies the Sanguine Formation. It is laterally equivalent to the Saline River and Franklin Mountain Formations as well as other Cambrian formations.

Fossils: Marine invertebrates

Dog Creek

69m Permian,Lower dolomite,gypsum,shale CO,KS,OK,TX Blaine Whitehorse(Red Bluff) fossils: GEOLEX link NO cgkn link Woodward/El Reno

Dollarhide

653m Pennsylvanian,Middle-Permian,Lower limestone,shale,sandstone ID(c) Milligen Formation cretaceous Grand Prize/Wood River Formation fossils:a few fusulinids,conodonts GEOLEX link NO cgkn link

Dolores Shale

600 meters or more of non-marine Upper Triassic sandstone, grit and conglomerate found in Colorado. It overlies the Moenkopi Formation/Cutler Formation and is overlain by the La Plata Sandstone/Entrada Sandstone

Fossils: crocodile, ganoid fish, dinosaur teeth, plants, stems

Dome Limestone

100 meters or more of massive gray siliceous Middle Cambrian Limestone found in Nevada and Utah. It overlies the Howell Limestone/Chisholm Shale and is overlain by the Swasey Formation/Whirlwind Formation.

Fossils: Mostly unfossilferous. A few trilobites reported.

Dome Creek

1738 meters of Cambrian dark shales and siltstones found in British Columbia. It overlies the Mural Formation and is overlain by the Yanks Peak Formation

Fossils: Upper Cambrian trilobites in uppermost beds

Dora Dolomite

About 70 meters of Silurian dolomite found in central Utah where it is a member of the Bluebell Dolomite. It overlies the Beecher Formation and is overlain by the Noah formation. Little or no information found.

Fossils: possibly.

Dotsero Formation

30 meters of Upper Cambrian dolomite,shale, and limestone found in Colorado(c). Includes the Clinetop and Glenwood Canyon members. It overlies the Sawatch Sandstone and is overlain by the Chaffee Formation. It a member of the Horseshoe Mountain Group.

Fossils: Algae in the upper beds, graptolites, trilobites, brachiopods

Double Mountain

? Permian gypsum, rock salt, sands, clays, sandstones, shales, and limestones TX(n,c) Clear Fork Dockum Group Whitehorse fossils:? GEOLEX link cgkn link group

Doughnut Shale

About 400 meters of Upper Mississippian shales, sandstone, and limestone found in Colorado (nw) and Utah(nc). It overlies the Humbug Formation and is overlain by the Morgan Formation/Round Valley.

Fossils: Marine invertebrates in the limestones

Dry Creek Shale

Roughly 10 to 30 meters of poorly exposed Middle(?) or Upper Cambrian shales found in many mountain ranges in Montana and Wyoming immediately above the highest Cambrian limestones. The Dry Creek shales overlie the Pilgrim limestone and are overlain by the Three Forks Shale/Jefferson Limestone/Sage Conglomerate

Fossils: None. The boundary with the underlying Pilgrim Limestone is conventionally set at the highest Cambrian limestone or the highest fossil bearing beds in the Cambrian sequence.

Duchesne River

324m Paleocene-Oligocene siltstone?/sandstone?/Tuff CO(nw)/UT(ne) Green River/Uinta fossils:uncommon GEOLEX link NO cgkn link

Duncan

250m Permian,Middle sandstone,shale OK,TX Enid,Hennessey Chickasha San Angelo fossils: GEOLEX link NO cgkn link El Reno

Dunderberg Shale

100 meters (766 max) of fossiliferous brownish Upper Cambrian Shale found in California, Nevada, and Utah. It was originally combined with the Hamburg Limestone in the Hamburg Formation. It is considered to be the uppermost member of the Nopah Formation. It overlies the Hamburg Dolomite/Halfpint Formation and is overlain by the Pogonip Group.

Fossils: trilobites

Dugway Ridge

? Cambrian,Upper dolomite UT(wc) Fera Garden City Hicks Formation fossils:girvanella,trilobites GEOLEX link NO cgkn link

Du Noir Limestone

Up to 30 meters of Upper Cambrian Limestone found in Wyoming. It overlies the Gros Ventre Formation/Dry Creek Shale and is overlain by the Darwin Sandstone/Open Door Limestone. Laterally equivalent to the Maurice Formation It is the lower member of the Gallatin Formation in NorthWest Wyoming.

Fossils: trilobites

Duo Lake

415m Ordovician to Lower Silurian slate,chert,minor limestone Northwest Territories, Yukon Territory Rabbitkettle Hailstone fossils-diverse Graptolites NO GEOLEX Entry cgkn http://weblex.nrcan.gc.ca/html/004000/GSCC00053004326.html

Duperow Formation

About 200 meters of Upper Devonian limestone,dolomite, shale and anhydrite found in Montana, Wyoming, North Dakota, South Dakota, Saskatchewan(s) and Manitoba(sw). It overlies the Souris River Formation/Interlake Group and is overlain by the Birdbear Formation. It is the oldest member of the Jefferson Group

Fossils: Reportedly common in some beds although it is not clear how common exposures are. brachiopods, fish

Dunedin

400 meters of Middle Devonian limestones found in North Eastern British Columbia. It overlies the Stone Formation and is overlain by the Besa River Shale/Pine Point. It is laterally equivalent to parts of the Hume Formation/Nahanni Formation

Fossils: Unknown

Durst Group

Pennsylvanian sandstone,shale,and limestone found in Colorado(nw) and Utah(ec). It includes the Hells Canyon, Morgan and Weber Formations. It overlies the Round Valley Formation and is overlain by the Moenkopi Formation.

Fossils: Abundant marine invertebrates in some bads

Duvernay Shale

Up to 250 meters of Upper Devonian oil shales found in Alberta. It overlies the Cooking Lake Formation and is overlain by the Ireton Formation/Grosmont Formation. May be entirely subsurface.

Fossils: Sparse marine invertebrates-tentaculitids, ostracods, conodonts, corals, brachiopods

Dyer Dolomite

25 meters of Upper Devonian and Lower Mississippean dolomitic limestone found in Colorado(c). It overlies the Parting Formation and is overlain by the Gilman Sandstone. It is a member of the Chaffee Group

Fossils: A few brachiopods and corals

Eager Formation

Lower Cambrian calcaerous shale, siltstone and limestone found in British Columbia. It overlies the Cranbrook Formation and is overlain by Middle Cambrian rocks.

Fossils: Marine invertebrates in some beds - trilobites

Eagle Mountain Shale

Up to 60 meters of green and brown sometimes fossiliferous Lower Cambrian Shale found in California and Nevada. It is the oldest member of the Carrara Formation. It overlies the [Zabriskie Quartzite #Zabriskie/] and is overlain by the Thimble Limestone.

Fossils: a few Ollenelid trilobites

Earlie Formation

up to 172 meters of Middle Cambrian shale,siltstone,and sandstone found in Alberta and Saskatchewan. It overlies the Basal sandstone and is overlain by the Deadwood Formation. It is laterally equivalent to the Mount Whyte, Cathedral, Stephen, Eldon and Pika formations.

Fossils: acid insoluble fragments of small marine invertebrates

Earp Formation

Up to 900 meters of Upper Pennsylvanian and Lower Permian found in Arizona(se) and New Mexico(sw). It overlies the Horquilla Limestone and is overlain by the Colina Limestone It is a membver of the Naco Group

Fossils: Uncommon-ostracods and gastropods. wood. fish scales. reptile foot prints.

Earn Group

4725 meters of Mississippian limestone, chert, slate, and quartzite found in the Yukon Territory. It overlays unnamed slates and Quartzites. It is overlain by the Anvil Range Group. It is divided into two or three formations Crystal Peak and Kalzas Formation/Portrait Lake and Prevost/Misfortune and Thor Hills/Gunsteel, Akie, and Warneford.

Fossils: Brachiopods and Corals in some beds.

East Arm Formation

25 meters of Silurian dolomite found in Manitoba. It overlies the Atikameg Dolomite and is overlain by the Cedar Lake Formation Not to be confused with the abandoned Upper Cambrian East Arm formation in Newfoundland.

Fossils: Marine invertebrates, algae

East Fork

457m+ Ordovician,Middle-Ordovician,Upper limestone,quartzite ID(sc) Hyndman ? Saturday Mountain fossils:trilobites(fragmentary) GEOLEX link NO cgkn link Not to be confused with the Cretaceous East Fork Fm of the NT

Eastland

53m Pennsylvanian,Upper limestone TX(c) Ranger Jacksboro Caddo Creek fossils: GEOLEX link NO cgkn link Canyon

Echo Canyon

Fossils:
91.4m Cambrian hard grey limestone Northwest Territories. Not to be confused with the Cretaceous Echo Canyon Conglomerate found in Utah Dead End Alder Mount Cap fossils NO GEOLEX link cgkn http://weblex.nrcan.gc.ca/html/004000/GSCC00053004477.html

Echo Shale

Up to 41 meters of Lower Cambrian Limestone found in Death Valley and adjacent Nevada. The Echo overlies the Thimble Limestone. It is overlain by the Gold Ace Limestone and is combined with the indistinguishable Pyramid Shale where the Gold Ace Limestone is missing. It is a member of the Carrara Formation.

Fossils: Basically none although one trilobite fossil has been reported

Eddleman Coal

? Pennsylvanian coal TX(nc) Blach Ranch fossils:pollen NO GEOLEX link NO cgkn link Cisco

El Reno

198m Permian,Middle shale,gypsum,sandstone,dolomite OK,TX Clear Fork/Hennessey Whitehorse fossils: GEOLEX link NO cgkn link El Reno

Elbert Formation

Up to 70 meters of occasionally fossiliferous marine Devonian shale and limestone found in the four corners region where Arizona, New Mexico, Colorado and Utah meet. It overlies Cambrian Formations Ignacio Quartzite/Muav Limestone/Uncompahgre Formation/Aneth Formation and is overlain by Mississippian Limestones Ouray Formation

Fossils: fish scales, invertebrates

Eldon Dolomite

Up to 500 meters of Middle Cambrian limestones, calcaerous mudstones, and dolomites found in Alberta and British Columbia. It overlies the Stephen Formation and is overlain by the Pika Formation. It is laterally equivalent to parts of the units of the Chancellor Formation/Earlie Formation/Titkana Formation/Windsor Mountain

Fossils: Marine invertebrates

Elephant Canyon

457m Pennsylvanian, Upper-Permian,Lower Limestone,Siltstone,Sandstone,Dolomite,Shale,Mudstone UT(se) Honaker Trail Cedar Mesa/Coconino Rico fossils:brachiopods, bryozoans,crinoids,horn corals,forams,algae,fusulinids,productids GEOLEX link 7607 NO cgkn link Cutler

Elko Formation

Up to 156 meters of Middle Cambrian dolomite and limestone found in the Southern Rocky Mountains of Alberta and British Columbia. It overlies the Gordon Shale and is overlain by the Windsor Mountain Formation Not to be confused with the Eocene-Oligocene Elko Formation in Nevada

Fossils: Unknown

Elko Formation (Nevada)

85 meters of Eocene/Oligocene oil shales found in Nevada. Not to be confused with the Middle Cambrian Elko Formation found in the Canadian Rockies.

Fossils: fresh water mollusks, plants, pollen

Ella Dolomite

Over 200 meters of sandy Middle Ordovician dolomite/marble found in Idaho. It overlies the Clayton Mine Quartzite/Cash Creek Quartzite and is overlain by the Kinnikinic Quartzite

Fossils: algal structures, brachiopods, conodonts

Eldorado Limestone

A Cambrian limestone that overlies the Prospect Mountain Quartzite in the Eureka mining district of Nevada. At a guess, it might correspond to one of the limestone members in the Carrara Formation.

Fossils: None?

Ellenburger

305m Ordovician,Lower limestone,dolomite,chert TX(c),NM Wilberns Marble Falls Gasconade,Roubidoux,Jefferson City fossils:marine invertebrates GEOLEX link NO cgkn link Ellenburger

Ellis Group

150 meter of Jurassic shales,sandstones,and limestones found in Southern Alberta, Montana, North Dakota, and Wyoming. see

Fossils: Abundant Jurassic marine fossils reported in middle limestone.

El Paso Limestone

Up to 400 meters of Upper Cambrian and Lower Ordovician limestones and dolomite found in New Mexico and Texas(w). It overlies the Bliss Sandstone and is overlain by the Cable Canyon Formation/Gym/Lobo. It is divided into a lower Sierrite Limestone and an upper Bat Cave Limestone

Fossils: Mostly sparse, but abundant marine invertebrates in some beds.

Elkhead

Up to 700 meters of Middle Cambrian limestone with one minor shale member found in Idaho. It overlies the Gibson Jack Formation and underlies the Bloomington Formation

Fossils: A few trilobites in a few beds

Elk Point Group

Up to 488 meters of Middle Devonian shales, evaporites, and dolomites found in British Columbia,Manitoba,Montana,North Dakota,The NorthWest Territories,Sasktchewan, and South Dakota(nw). It overlies Precambrian through Silurian rocks, and is overlain by the Dawson Bay Formation/Souris River Formation/Beaverhill Lake Formation. It includes the Ashern Formation,Elm Point Formation,Interlake Formation,Prairie Formation, and Winnipegosis Formation.

Fossils: Diverse marine invertebrates-corals, Amphipora, brachiopods, gastropods, pelecypods, crinoids, cephalopods, nautiloids, ostracods, and plant spores

Elm Point Limestone

Up to 19 meters of Middle Devonian limestone and dolomite found in North Dakota and Manitoba It overlies Sherven Formation and is overlain by the Winnipegosis Formation. The lower beds are broken out as the Ashern Formation by some authors.

Fossils: Well preserved brachiopods in some beds

Elmer Creek Formation

110 meters of Ordovician siliceous argillite, dolomite, and shale found in the Yukon Territory. It overlies the Gull Lake Formation and is a member of the Road River Group.

Fossils: Graptolites and conodonts

Ely Limestone

610m Mississippian,Upper-Permian,Lower limestone,chert,shale NV(ec),UT(wc) White Pine Shale,Chainman,Diamond Peak Formation,Scotty Wash Arcturus,Hogan,Ferguson Mountain,Riepe Spring fossils:crinoids,brachiopods,corals,fusulinids GEOLEX link NO cgkn link Ely

Ely Springs Dolomite

About 150 meters of Upper Ordovician dolomite found in California, Idaho, Nevada and Utah. It overlies the Eureka Quartzite and is overlain by the Hidden Valley Dolomite/Vaughn Gulch Limestone

Fossils: uncommon. Some ichnofossils?

Endicott Group

As much as 4400 meters of Upper Devonian to Lower Permian shales, sandstones and conglomerates found in Alaska(n) and the Yukon and Northwest Territories. It includes the Hunt Fork Shale, Itkilyariak Formation, Kanayut Conglomerate, Kayak Shale, Kekiktuk Conglomerate, Kurupa Sandstone, and Noatak Sandstone. It overlies the Skajit Limestone and is overlain by the Lisburne Group.

Fossils: corals, brachiopods, plants

Engelmann Formation

As much as 838 meters of Middle and Upper Devonian dolomite and limestone found in Utah(nw). It overlies the Sevy dolomite and is overlain by the Goshoot formation.

Fossils: brachiopods, gastropods, conodonts, corals

Englewood limestone

Up to 20 meters of colorful Upper Devonian and Lower Mississippian limestone and shale found in Montana(se), North Dakota(c), Nebraska(nw),South Dakota(nw),and Wyoming(ne). It was described as the Eocarboniferous Limestone in some early papers. It overlies the Deadwood Formation/Whitewood Limestone/Lyleton Formation/Three Forks/Fremont Canyon Frmation and is overlain by the Pahasapa Limestone/Lodgepole Formation

Fossils: corals, mollusks, brachiopods, crinoids, shark teeth

Enid

457m Permian gypsum,shale,sandstone KS,OK Wellington Blaine fossils: GEOLEX link NO cgkn link Enid

Emerson Formation

300 meters or more of Middle Cambrian to Early Ordovician shale, limestone, and conglomerate found in Montana It overlies the Flathead Sandstone and is overlain by the Bighorn Dolomite It is subdivided into Middle Cambrian Wolsey Shale, Meagher, and Park members and an Upper Cambrian Zortman member.

Fossils: Middle and Upper Cambrian marine invertebrates present

Emigrant Shale

700 meters of Uppermost Lower Cambrian to Lowermost Ordovician mudstones and limestones found in the Inyo-White-Silverpeak ranges of California and adjacent Nevada. The Emigrant overlies the Mule Spring Limestone. It is overlain by the Palmetto Formation.

Fossils: Rare except for some trilobites and others in the basal beds

Entrada

436m Jurassic,Middle-Jurassic,Upper sandstone AZ(ne),CO,NM(nw),UT(se),WY Carmel/Dockum Group/Homestake/Redonda/Sangre de Christo formation Curtis/Morrison Formation/Wanakah/Iron Springs fossils:None? GEOLEX link NO cgkn link San Rafael

Epitaph Dolomite

250 meters of Lower Permian dolomite with interbedded beds of sandstone, mudstone, and limestone found in Arizonea(se) and New Mexico(sw) It overlies the Colina Limestone and is overlain by the Scherrer Formation/Glance Conglomerate/Cintura Formation It is a member of the Naco Group

Fossils: gastropods, brachiopods, corals in some outcrops.

Ernestina Lake

23 meters of Middle Devonian shale, limestone/dolomite, and anhydrite found in Alberta, British Columbia, and the NorthWest Territories. It overlies the Lotsberg Formation and is overlain by the Cold Lake/Contact Rapids It is laterally equivalent to the Fitzgerald Formation/Stone/Arnica/Mirage Point formations.

Fossils: Ostracods

Esbataottine

200m Ordovician,Middle limestone NT Sunblood Formation Whittaker Formation Sunblood Formation fossils:abundant marine invertebrates- trilobites, brachiopods ostracodes, bryozoans and conodonts. NO GEOLEX link cgkn link

Escabrosa Limestone

Up to 250 meters or more of pure, crystaline Mississippian Limestone widely distributed in Southern Arizona and adjacent New Mexico. Overlies the Martin Limestone/Percha Shale and is overlain by the Naco Limestone/Black Prince Limestone/Horquilla Limestone/Paradise Formation. In some areas is considered a group with Keating Formation and Hachita Limestone members

Fossils: Crinoids, corals, brachiopods, gastropods, pelecypods, trilobites, bryozoa, cephalopods, fish teeth

Esplanade Sandstone

Up to 185 meters of hard red Lower Permian sandstone found in Northern Arizona where it overlies the Wescogame Sandstone/Pakoon Limestone and is overlain by the Hermit Shale. It is laterally equivalent to the Queantoweap Sandstone It is a member of the Supai Group

Fossils: possibly amphibian footprints and/or plant fossils

Etanda Formation

More than 700 meters of Devonian and Mississippian black shales with minor beds of other lithologies found in Canada's Northwest Territories. It is apparently equivalent in whole or in part to the Flett Formation/Prophet Formation/Clausen Formation/Yohin Formation/Besa River Formation of adjacent areas.

Fossils: A few brachiopods

Etchegoin

1200m? Miocene,Upper-Pliocene sand,gravel,clay,conglomerate,tuff CA(c) Jacalitos/Monterey/Reef Ridge Aromas/Tulare/San Joaquin fossils: marine invertebrates,vertebrates GEOLEX link NO cgkn link

Etherington

Up to 210 meters of Upper Mississippian dolomite, limestone and green shale, found in Montana and Alberta. It overlies the Mount Head Formation and is overlain by the Tobermory Formation/Todhunter Formation It is a member of the Rundle Group

Fossils: abundant silicified brachiopods, echinoderm plates, bryozoa, algae

Etivluk Group

Lower Pennsylvanian to Middle Jurassic thin bedded chert, shale and limestone found in Alaska(n). It overlies the Lisburne Group. It includes the Imnaitchiak Chert, Otuk Formation, and Siksikpuk Formation.

Fossils: Marine(?) invertebrates(?)

Ettrain

732m Pennsylvanian limestone YU Hart River Jungle Creek fossils:brachiopods,forams,corals NO GEOLEX link cgkn link ?

Eureka Quartzite

About 150 meters of vitreous Middle Ordovician Quartzite found in California, Nevada, Utah, and Idaho. It overlies the Pogonip Limestone/Crystal Peak Dolomite and is overlain by the Lone Mountain Formation/Hanson CreekFish Haven Dolomite/Ely Springs Dolomite.

Fossils: None?

Evie Formation

30m of Middle Devonian limestone and black shale found in British Columbia. It overlies the Pine Point Formation and is overlain by the Otter Park Formation It is a member of the Horn River Formation

Fossils: Unknown

Exshaw Formation

Up to 50 meters of Upper Devonian and Lower Mississippian black shale and siltstone found in Montana(nw) and Alberta, British Columbia, Nunavat. It is overlain by the Banff Formation

Fossils: fish fragments, conodonts

Eye of Needle Limestone

80m Cambrian,Middle limestone UT(w) Swasey Limestone Pierson Cove Wheeler Shale fossils-marine invertebrates NO GEOLEX link No cgkn link

Fairbank Sandstone

30 meters of Middle Pennsylvanian sandstone and shale found in Nebraska(nw), South Dakota and Wyoming(se). It is overlain by the Reclamation Group/Roundtop Group/and Hayden Group. It is a member of the Hartville Formation

Fossils: Few? None?

Fairholme Group

Up to 730 meters of Middle and Upper Devonian Limestones, dolomites and Calcaerous shales and sandstones found in Alberta and British Columbia. It includes the Flume/Hollebeke/Borsato, Cairn, Southesk, Maligne, Perdrix, and Mt HawkFormations. It overlies the Beaverhill Lake Group/Souris River Formation/Yahatinda Formation/Harrogate Formation. It is overlain by the Crowfoot/Sassenach/Alexo/Palliser. It is laterally equivalent to the Woodbend/Winterburn/Birdbear/Duperow/Souris River/Starbird Formations.

Fossils: Marine invertebrates

Fandangle Limestone

509m Cambrian,Middle limestone,dolomite UT(wc) Trailer Limestone Lamb Dolomite fossils:ichnofossils,poorly preserved trilobites GEOLEX link http://ngmdb.usgs.gov/Geolex/Units/Fandangle_8075.html NO cgkn link

Fantasque

55 meters of Permian chert, shale and calcaerous sandstone found in British Columbia, Yukon Territory, Northwest Territories. It overlies the Flett Formation/Mattson Formation and is overlain by Mesozoic beds. It is laterally equivalent to the Belloy Formation/Ranger Canyon chert/Mowitch sandstone

Fossils: A few brachiopods in the sandstones

Fenstermaker Wash Formation

Up to 260 meters of Middle Devonian packstone and siltstone found in Nevada(c). It overlies the Denay Formation and is overlain by the Deep Spring Formation

Fossils: fragments of echnioderms, brachiopods, stromatoporoids, corals, etc

Fera Limestone

122m Cambrian,Upper limestone,dolomite UT(nw) Straight Canyon Dugway Ridge Orr Formation fossils:girvanella,brachiopods GEOLEX link NO cgkn link

Fergus Group

305 meters of Upper Mississippian beds found in Montana. It overlies the Heath Formation and is overlain by the Amsden Formation. It consists of the Alaska Bench Formation, Bear Gulch Formation, Cameron Creek Formation and the Tyler Sandstone.

Fossils: sparse-thin shelled brachiopods, stromatolites, pelecypods, ostracods, shrimp, conodonts, gastrapods and fish

Ferguson Mountain

422m+ Permian,Lower limestone,sandstone,quartzite NV(ec),UT(ec) Ely,Hogan,Strathearn Pequop Riepe Spring,Riepetown fossils:corals,fusulinoids,bryozoans,algae GEOLEX link NO cgkn link group

Fernando

129m Pliocene-Pleistocene Conglomerate/Sandstone/Clay CA(sw) Modelo/Puente Pliestocene Pico/Repetto fossils:marine forams/invertebrates9?) GEOLEX link NO cgkn link

Fierro Limestone

229m Mississippian,Pennsylvanian,Permian limestone,chert,shale NM(w) Percha Shale Beartooth quartzite (obsolete)Lake Valley #LakeValley | fossils:abundant marine invertebrates | [GEOLEX link http://ngmdb.usgs.gov/Geolex/NewUnits/unit_8108.html NO cgkn link

Fife Lake Formation

20 meters of Silurian limestone and calcaerous mudstone found in Montana?, North Dakota and Saskatchewan. There may be no surface exposures. overlies the Strathclair Formation and underlies the Guernsey Formation It is a member of the Interlake Group

Fossils: fairly abundant - gastropods,ostracods,crinoid fragments,etc

Finis Shale

30m Pennsylvanian,Upper shale/sandstone TX(nc) Caddo Creek Jacksboro fossils:? GEOLEX link NO cgkn link Cisco

Fish Springs

43m Cambrian,Middle limestone,shale UT(wc) Trippe Limestone Lamb Dolomite/Wah Wah Summit Formation Marjum,Fandangle fossils:trilobites? GEOLEX link NO cgkn link Trippe Limestone

Fitchville

About 90 meters of Late Devonian/Early Mississippian dolomite found in central Utah. It overlies the Pinyon Peak Limestone and is overlain by the Gardison Limestone

Fossils: A few corals

Fillmore Limestone

Lower Ordovician Limestone, conglomerate and limey silstones found in Western Utah and Eastern Nevada. It overlies the House Limestone and is overlain by the Wah Wah Limestone. It is a member of the Pogonip Group

Fossils: abundant fossils

Fish Haven Dolomite

150 meters or more of fossiliferous, cherty, dark gray Upper Ordovician dolomite found in Idaho, Nevada and Utah. It overlies the Swan Peak Quartzite/Chokecherry Dolomite/Opohonga limestone/Kinnikinic Quartzite/Eureka Quartzite and is overlain by the Laketown Dolomite/Floride Dolomite/Bluebell dolomite. It is laterally equivalent to the Bighorn Dolomite. Some authors divide the Fish Haven into three members -- the Paris Peak Formation, Deep Lakes Formation, and Bloomington Lake Formation

Fossils: abundant corals, bryozoa, crinoids, gastropods and brachiopods.

Fisher Branch Dolomite

5 meters of sometimes yellowish, grey Lower Silurian dolomite found in Manitoba. It overlies the Stonewall Formation and is overlain by the Inwood dolomite.

Fossils: abundant brachiopods and corals

Fitzgerald

about 100 meters of Upper Silurian and Devonian dolomitic limestone, gypsum, and anhydrite found in Alberta and the Northwest Territories. It overlies unnamed red beds and is overlain by the Pine Point Formation. It is laterally equivalent to the Elk Point/Bear Rock/Lone Mountain (Canada) formations.

Fossils: None?

Flagstaff

305m Paleocene,Upper-Eocene,Lower limestone UT(ec) North Horn Colton Cedar Breaks fossils:gastropods, pelecypods, ostracods GEOLEX link NO cgkn link Wasatch

Flathead Sandstone

Up to 200 meters of Middle Cambrian sandstones with minor shales found in Idaho, Montana, and Wyoming. It overlies Proterozoic metamorphics/Bonner Quartzite and is overlain by the Emerson Formation/Gros Ventre Formation. It is laterally equivalent to the Brigham Quartzite/Depass Formation

Fossils: Middle Cambrian marine invertebrates in the shales in some areas - Lingulella, Hyolithes, trilobites

Flett Formation

475 meters of Lower and Middle Mississippian limestones found in Canada's Northwest Territories. It overlies the Clausen/Besa River Formations and is overlain by the Mattson/Fantasque Formations/Fort St John Group. It is laterally equivalent to all or parts of the Prophet/Debolt/Golata/Shunda Formations.

Fossils: marine invertebrates -- pelmatazoa, sponge spicules, bryozoans, brachiopods, corals, forams, plants

Floride Dolomite

About 40 meters of Late Ordovician and Lower Silurian dolomite found in Nevada and Utah. It overlies the Fish Haven Dolomite and is overlain by the Bell Hill Dolomite. It is a member of the Ely Springs Dolomite

Fossils: Poorly preserved (?) corals in the upper part of the formation

Flour Sack

40 meters of Middle Cambrian shale, siltstone, and limestone found in Arizona(nw). It overlies the Meriwitica Dolomite and is overlain by the Muav Limestone. It is a member of the Bright Angel Shale.

Fossils: trilobites, brachiopods

FlowerPot

46m Permian,Lower shale,gypsum,dolomite KS(sw),OK,TX(w) Cedar Hills,San Angelo,Duncan Cave Creek,Blaine fossils: GEOLEX link | NO cgkn link | [Pease River,Nippewalla,El Reno

Flume Limestone

125 meters of Upper Devonian biostromal limestone and dolomite found in British Columbia and Alberta. Not to be confused with the Lower Devonian Flume Formation in New Brunswick or the Ordovician Flume member found in Ontario. It overlies early Paleozoic beds/Yahatinda Formation. It is overlain by the Maligne/Perdrix Formations. It is sometimes included in the Cairn Formation and or as the oldest member of the Fairholme Group

Fossils: Stromatoporoids and amphipora

Fox Ford

152m Pennsylvanian clay,shale TX(c) underlaying Horse Creek fossils: GEOLEX link NO cgkn link Strawn

Fortress Mountain

3048m Cretaceous,Lower shale,sandstone,conglomerate AK(n) Tiglukpuk/Okpikruak Formation Torok fossils:marine invertebrates GEOLEX link NO cgkn link (Not to be confused with the Pennsylvanian Fortree Mtn beds in the Kananakis Formation in Alberta)

Ford Lake Shale

610m Devonian,Upper-Mississippian,Lower shale,chert AK(ec),YU Nation River/Imperial Formation Calico Bluff/Step/Hart River Calico Bluff marine invertebrates GEOLEX http://ngmdb.usgs.gov/Geolex/NewUnits/unit_5338.html cgkn http://weblex.nrcan.gc.ca/html/005000/GSCC00053005117.html

Forelle Limestone

10 meters of Upper Permian limestone grading into evaporites found in Colorado(n), Nebraska, and wyoming(se). It overlies the Glendo Formation/Satanka Shale and is overlain by the Lykins Formation/Chugwater Formation It is a member of the Goose Egg Formation

Fossils: Marine invertebrates-Myalina

Forlorn Hope Formation

Roughly 100 meters of Lower Cambrian shale and limestones found in Nevada(ec) and Utah(wc). In modern usage it is included in the Pioche Shale. It would presumably overlie the Prospect Mountain Quartite and be overlain by the Comet Shale

Fossils: Marine invertebrates - trilobites, etc

Fort Apache Limestone

Up to 30 meters of thin bedded, fossiliferous Lower Permian limestone found in Arizona where it occurs about 30 meters below the top of the Supai Formation A member of the Schnebly Hill Formation of the Sedona Group/the Supai Formation

Fossils: Locally abundant marine invertebrates-mollusks,brachiopods,and cephalopods

Fort Creek Shale

An obsolete term for 457 meters of Upper Devonian black shales with minor limestones and sandstones found in the NorthWest Territories. The Fort Creek beds overlie the Ramparts Formation and are overlain by the Bosworth(Imperial Formation) Modern usage divides the Fort Creek into the Hare Indian, Canol and Imperial formations.

Fossils: brachiopods,styolina

Fort Mountain Member

About 500 meters of Lower Cambrian quartzite and silicaeous shale found in Alberta and British Columbia. It overlies the Hector Formation and is overlain by the Lake Louise Shale/St Piran Formation. It is the basal member of the Gog Group. Not to be confused with the Fort Mountain Gneiss found in Georgia.

Fossils: ichnofossils

Fort Simpson

Up to 1000 meters of Upper Devonian grey shale found in Alberta, British Columbia, and the NorthWest Territories. It overlies the Horn River Formation and is overlain by the Redknife/Kakisa/Trout River/Tetcho formations

Fossils: Unknown

Fort Vermilion

37 meters of interbedded Middle Devonian anhydrite,limestone, and dolomite found in Alberta. It overlies the Watt Mountain Shales and is overlain by the Slave Point Formation/Swan Hills Formation

Fossils: None?

Fountain Formation

300+ meters of red Pennsylvanian and Lower Permian sandstone, conglomerate and grit found in Colorado(e) and Wyoming(se). It overlies the overlies Millsap limestone/Fremont limestone/Harding sandstone/Manitou limestone/Glen Eyrie Formation and is overlain by the Morrison Formation.

Fossils: None

Fossil Mountain

Up to 100 meters of Lower Permian limestone and chert found in Arizona,Nevada,and Utah. It is the lower member of the Kaibab formation It overlies the Toroweap Formation and is overlain by the Harrisburg Formation.

Fossils: Abundant fossils -brachiopods, crinoids, bryozoans, sponges

Franciscan

15240m+ Jurassic-Miocene schist,serpentine,sandstone,basalt,chert,limestone CA(w),OR(w) Knoxville/Panoche fossils:radiolarians,forams,marine invertebrates(rare),marine vertebrates(rare) GEOLEX link NO cgkn link

Franklin Mountain

As much as 1680 meters of Upper Cambrian and Lower Ordovician shales and limestones found in the Northwest Territories and Yukon Territory. It overlies the Saline River Formation/Proterozoic beds] and is overlain by the Mount Kindle Formation/Langton Bay Formation. It is laterally equivalent to the Road River/Rabbitkettle/Broken Skull/Dodo formations. Not to be confused with the Franklin Mountain Basalt in Oregon or the Franklin Mountains Formation in New Mexico.

Fossils: Marine invertebrates-stromatolites,brachiopods,echinoderm fragments,gastropods,straight cephalopods,trilobites, and graptolites.

Freeman Silt

100m Miocene,Lower silt CA(sc) Jewett Olcese Jewett fossils:mollusks,forams,fish scales GEOLEX link NO cgkn link Temblor

Freeman Peak Formation

730 meters of calcaerous Lower Permian sandstone and quartzite found in Utah(c). It overlies the Curry Peak Formation and is overlain by the Kirkman Formation

Fossils: locally abundant fusulinids

Fremont limestone

Up to 100 meters of fossiliferous Upper Ordovician limestone/dolostone with some sandstone beds found in Colorado(c). It overlies the Harding Sandstone and is overlain by the Millsap limestone/Williams Canyon Formation/Fountain Formation.

Fossils: Protozoa, Corals, Echinoids, Brachiopods, Bivalves, Gastropods, Cephalopods, Trilobites

Fremont Canyon Sandstone

Up to 87 meters of Upper Devonian sandstone or quartzite found in Wyoming(se). It lies on precambrian rocks and is overlain by the Englewood Formation

Fossils: A few ichnofossils.

Friars

35m Eocene,Middle sandstone/claystone CA(sw) Scripps Poway Conglomerate fossils:uncommon vertebrates,pollen GEOLEX link NO cgkn link La Jolla

Frobisher-Alida

114m Mississippian limestones,sandstones,evaporites MB-ND-SK Tilston Ratcliffe fossils:abundant corals,brachipoda,mollusca GEOLEX link http://ngmdb.usgs.gov/Geolex/NewUnits/unit_8210.html cgkn link http://weblex.nrcan.gc.ca/html/005000/GSCC00053005353.html Madison subsurface only

Funeral

778 meters of Middle Devonian limestones and calcaerouss shale found in the Northwest Territories. It overlies the Arnica Formation/Grizzly Bear Formation and is overlain by the Headless/Landry/Natla Formations. Not to be confused with the Pliocene-Pleistocene Funeral Formation found in California.

Fossils: Well preserved brachiopods

Furner Valley Limestone

1650 meters of Upper Pennsylvanian and Lower Permian limestone and dolomite with minor detrial beds found in Utah(c). It overlies the Bingham Mine Formation and is overlain by the Diamond Creek formation It is a member of the Oquirrh Group

Fossils: fusulinids

Fusselman Dolomite

Over 300 meters in places of Lower and Middle Silurian limestone and dolomite found in New Mexico and Texas. It overlies the Montoya Limestone/Cutter Formation and is overlain by the Hueco Limestone/Percha Shale/Onate Formation

Fossils: Generally uncommon, but abundant in a few beds. -- anthozoans, bryozoans, brachiopods, mollusks

Gallatin Limestone

100 meters or more of Upper Cambrian limestone and shale found in Idaho, Montana and Wyoming. Overlies the Flathead Sandstone and is overlain by the Jefferson Limestone/Bighorn Dolomite. The name was abandoned in some areas in the early twentieth century. Subdivided/equivalent to the Du Noir Limestone,Grove Creek Limestone,Open Door Limestone,Pilgrim Dolostone,Sage Limestone, Snowy Range Formation.

Fossils: Abundant trilobites and brachiopods reported in limestones in the basal limestone. Fossils also present in the upper beds.

Gametrail Formation

322m Proterozoic Limestone,Dolomite NT,NU,YT Shezel/Keele Blue Flower fossils:stromatolites NO GEOLEX link cgkn link http://weblex.nrcan.gc.ca/html/005000/GSCC00053005418.html ?

Garden Creek

426m? Cambrian,Middle phylitte ID(sc) Bayhorse fossils: None GEOLEX link 8240 NO cgkn link

Garden City Limestone

525m Ordovician,Lower-Ordovician,Middle Limestone,Limestone Breccia ID(se),UT(n) St Charles Swan Peak Pogonip fossils:diverse, abundant marine invertebrates-trilobites,ostracodes,brachiopods,mollusks,Porifera,graptolites GEOLEX link NO cgkn link

Gardison Limestone

190 meters or more of fine grained Lower Mississippian limestone found in Utah. It overlies the Fitchville Formation and is overlain by the Deseret Limestone

Fossils: Well preserved brachiopods, gastropods, and corals.

Gardner Limestone

An obsolete term for 250 meters or more of cherty Early Mississippian limestones and dolomites found in central Utah. It overlies the Victoria Formation and is overlain by the Pine Canyon Limestone The rocks have been reassigned to the Victoria, Pinyon Peak, Fitchville, Gardison, and Deseret formations.

Fossils: abundant silicified corals, brachiopods, crinoids

Garfield Formation

An obsolete term for as much as 800 meters of Pennsylvanian conglomerate, quartzite, sandstone, shale, and limestone found in West Central Colorado. It overlies the Ouray Formation and is overlain by the Kangaroo Formation The Garfield beds are now assigned to the Belden and Minturn Formations.

Fossils: Marine invertebrates - brachiopods

Garita Creek

71m Triassic,Upper mudstone NM(n) Santa Rosa Trujillo fossils:? GEOLEX link NO cgkn link Chinle

Gatecliff Formation

An unspecified thickness of Lower Silurian cherty dolomite found in Nevada. It overlies the Ely Springs Dolomite and is overlain by the Masket Formation

Fossils: corals, other marine invertebrates?

Geertsen Canyon Quartzite

Up to 1000 meters of Lower Cambrian Quartzite found in Idaho(se) and Utah(n). It overlies the Browns Hole Formation and is overlain by the Langston Dolomite. It is the Uppermost member of the Brigham Group.

Fossils: Few if any

Gerster Limestone

200 meters of sandy Permian limestone found in Utah(c). It overlies the Oquirrh Group and is overlain by Triassic rocks. It is a member of the Park City Group

Fossils: Abundant brachiopods, as well as bryozoa and crinoid fragments

Geuda

122m Permian clay,shale,limestone,gypsum,salt KS Marion Wellington Wellington fossils:brachiopods,bivalves,ichnofossils GEOLEX link NO cgkn link Sumner

Gibson Jack

More than 300 meters of Early and Middle Cambrian quartzite, siltstone and sandstone found in Idaho It is overlain by the Elkhead Limestone/Langston Formation It is a member of the Brigham Group It is laterally equivalent to the Lead Bell Shale

Fossils: A few arthropod fossils have been reported

Gilman Sandstone

6 to 10 meters of Uppermost Devonian/Lower Mississippian sandy dolomite with breccias found in Colorado(c). It overlies the Dyer formation and is overlain by the Leadville Limestone. Not to be confused with the Lower Cambrian Gilman Quartzite found in Quebec and Vermont. The Gilman sandstone is a member of the Chaffee Group/Leadville Formation.

Fossils: None.

Gilson Dolomite

About 400 meters of Upper Devonian dolomite found in Utah(nw). It overlies the Goshoot Quartzite and is overlain by the Hanauer Quartzite

Fossils: abundant, but poorly preserved brachiopods, corals, gastropods, pelecypods, crinoids

Glen

thick Age rocks AK(ec) Tahkandit Limestone fossils: NO GEOLEX link NO cgkn link

Glen Canyon Sandstone

600m Triassic,Upper-Jurassic,Lower sandstone,shale,limestone AZ(n),CO(w).NM(mw),NV,UT Chinle Carmel La Plata freshwater mollusks,crustacea,fish,reptiles,plants GEOLEX link NO cgkn link Glen Canyon

Glen Eyrie Formation

13 meters of Carboniferous shale and sandstone found in Colorado(c). It overlies the Millsap Formation/Manitou Limestone and is overlain by the Fountain formation.

Fossils: A few plants-Lepidodendron

Glendo Shale

Up to 25 meters of red Upper(?) Permian shale with some limestone and Gypsum found in Colorado,South Dakota,and Wyoming(se). It overlies the Minnekahta limestone and is overlain by the Forelle limestone. It is a member of the Goose Egg Formation of the Phosphoria Group.

Fossils: None?

Glenn Creek Shale

Up to 22 meters of red Middle Devonian shale and limestone found in Montana(w). It overlies the White Ridge limestone and is overlain by the Coopers Lake limestone. It is a member of the Jefferson Limestone.

Fossils: None?

Glenogle Formation

750 meters of Lower Ordovician black shales with siltstone and sandstone laminations found in British Columbia(ce). It overlies the McKay Formation and is overlain by the Mt Wilson Formation

Fossils: abundant graptolites

Gubik

? Pleistocene sand AK(n) Colville fossils: NO GEOLEX link NO cgkn link

Goddard Shale

610m Mississippian,Upper shale OK(c) Caney | fossils:crinoids,pelecypods,cephalopods,crustaceans GEOLEX link NO cgkn link

Goodsprings Dolomite

750m Cambrian-Devonian,Middle dolomite CA(e),NV(sw) Bright Angel Sultan Muav,Bonanza King,Eureka fossils:sparse GEOLEX link NO cgkn link

Gordon Mountain

83m Cambrian,Middle-Cambrian,Upper limestone,shale MT(nw) Pentagon Shale Switchback Limestone obsolete-Steamboat fossils GEOLEX link http://ngmdb.usgs.gov/Geolex/NewUnits/unit_8422.html NO cgkn link

Gorman

130m Ordovician,Lower limestone,dolomite TX(c) Tanyard #Tanyard | [Honeycut fossils: GEOLEX link NO cgkn link Ellenburger

Graford Limestone

137m Pennsylvanian,Upper shale,limestone,sand TX(c) Palo Pinto Ranger/Cedarton fossils:abundant but poorly preserved GEOLEX link NO cgkn link Canyon

Graham Shale

183m Pennsylvanian,Upper rocks TX(c),OK Home Creek Avis fossils:abundant marine invertebrates GEOLEX link NO cgkn link Cisco

Grampian Limestone

Cambiran-Pennsylvanian,Lower limestone UT(sw) Morehouse fossils:none GEOLEX link NO cgkn link

Grand Prize

2500m Pennsylvanian,Middle-Permian,Lower siltstone,limestone ID(c) Wood River Formation/Salmon River Dollarhide fossils:marine invertebrates GEOLEX link NO cgkn link

Gravelbourg

60m Jurassic,Middle limestone,shale AB,SK,MB,MN? Madison,Watrous Shaunavon Melita,Nesson,Piper,Reston fossils:marine invertebrates(fragments),fish scales NO GEOLEX link cgkn link

Greenock

An obsolete term for Permian beds found in Alberta now assigned to the Ishbel Group Fossils:
427m Permian sandstone,shale,dolomite Alberta(sw),British Columbia(se) Tunnel Mountain Spray River Ishbel Group fish,marine invertebrates NO GEOLEX ENTRY NO CGKN link

Greer

91m Permian,Lower-Permian,Middle clay,shale,sandstone,gypsum,limestone OK(sw),TX(n?) Woodward Quartermaster Blaine,Dog Creek,Whitehorse,Cloud Chief fossils: GEOLEX link NO cgkn link

Grotto

67m Devonian,Upper dolomites AB(sw),BC(se) Peechee Southesk fossils:often abundant corals NO GEOLEX link cgkn link

Grumbler

183m Devonian,Upper limestone,shale,siltstone AB,BC,NT Hay River Formation Trout River Besa River Shale/Fort Simpson Formation fossils:corals,brachiopods NO GEOLEX link cgkn link group obsolete term for Twin Falls Formation, Tathlina, Redknife and Kakisa formations

Glenwood Canyon Formation

About 30 meters of Upper Cambrian dolomite,shale,and siltstone found in Colorado(wc). It overlies the Sawatch quartzite and is overlain by the Clinetop Limestone. It is a member of the Dotsero Formation of the Horseshoe Mountain Group.

Fossils: None?

Glorieta Sandstone

Up to 90 meters of Lower Permian sandstone found in Arizona, New Mexico, Oklahoma, and Texas. It overlies the Yeso Formation and is overlain by the San Andreas Formation. It is a member of the Manzano Group

Fossils: A few fusulinids have been found.

Gobbler

Up to 500 meters of Pennsylvanian limestone,shale and sandstone found in New Mexico(sc). It overlies the Helms Formation/Rancheria Formation and is overlain by the Beeman Formation. It is a member of the Magdalena Group

Fossils: crinoids, brachiopods, bryozoans

Godiva Limestone

700 meters of gray to black Lower Mississippian limestone with minor shale and sandstone found in Utah(nw). Description is confused. May be equivalent to the Pine Canyon Limestone/Gardner Formation possibly plus other beds. It is overlain by the Humbug Formation

Fossils: crinoids, corals

Gog Group

Up to 2180 meters of Lower Cambrian quartzites with some limestones and shales found in the Rocky Mountains of Alberta (wc) and British Columbia (ec). It includes the Fort Mountain Member/McNaughton Formation/St Piran Member/Mahto Formation/Lake Louise Shale/Holmes River Shale/Mural Limestone. It overlies the Miette Group and is overlain by the Mount Whyte Formation/Hota-Adolphus Formation/Chancellor Shale. It is laterally equivalent to the Hamill Group/Badshot Formation/Cariboo Group

Fossils: ichnofossils, a few marine invertebrates in some beds

Golata

About 1360m of heterogeneous near shore Upper Mississippian sediments - limestone, shale, sandstone, coal, anhydrite found in Alberta and British Columbia. It overlies the Debolt Formation/Prophet Formation and is overlain by Belloy Formation. It is latterally equivalent to parts of the Mattson Formation/Mount Head Formation/Etherington Formation/Kibbey Formation

Fossils: locally marine invertebrates - locally abundant, diverse plants

Gold Ace Limestone

A thin bedded Lower Cambrian Limestone and shale found in Death Valley and adjacent Nevada. It overlies the Echo Shale and is overlain by the Pyramid Shale. It is a member of the Carrara Formation.

Fossils: fragments of trilobites

Goodridge Formation

An obsolete term for Pennsylvanian and Permian beds in Utah, now assigned to the Rico and Hermosa formations.

Fossils:

Goodsir Formation

An obsolete name for the McKay Formation

Goodwin Limestone

Up to 700 meters of Uppermost Cambrian and Early Ordovician limestones found in Southern and Nevada. It overlies the Nopah Formation and is overlain by the Ninemile Formation. It is a member of the Pogonip Group.

Fossils: Trilobite and brachiopod fragments

Goose Egg Formation

About 150 meters of Upper Permian and/or Lower Triassic redbed sandstone with minor limestone found in Colorado(e). It overlies the Lyons formation/Ingleside Formation and is overlain by the Morrison formation/Ralston formation. Various authors include the Blaine Gypsum, Bergen Shale, Falcon Limestone Member,Forelle Limestone, Glennon Limestone, Harriman Shale, Park Creek Limestone Member, Red Canyon, and/or Strain Shale in the Goose Egg.

Fossils: A few algae

Gordon Shale

89 meters of Middle Cambrian shale found in Alberta, Montana(nw). It overlies the Flathead Sandstone and is overlain by the Meagher Limestone/Damnation Limestone. Is laterally equivalent to parts of the Gros Ventre/Brigham quartzite/Langston limestone/Ute limestone/Howell limestone/Comet shale/Lyndon limestone/Chisholm shale

Fossils: Fairly diverse marine invertebrates

Goshoot

Up 330 meters of Upper Devonian dolomite and quartzite found in Utah(nw). It overlies the Engelmann Formation and is overlain by the Gilson dolomite

Fossils: corals, brachiopods, stromatoporoids, gastropods

Goshute Canyon Formation

Up to 2000 meters of quartzite and shale underlying the Lower Cambrian Prospect Mountain Quartzite in Nevada and Utah. The Goshute Canyon overlies proterozoic metamorphic rocks/unnamed Cambrian or older sediments.

Fossils: none?

Gossage Limestone

480 meters of Silurian, Lower and Middle Devonian limestones and dolomites found in British Columbia and the Yukon Territory. It overlies the Ronning Group/Mt Kindle Formation and is overlain by the Hume Formation It is laterally equivalent to the Bear Rock, Sombre, Delorme(?), Arnica, Landry Formations.

Fossils: Unknown

Gothic

537m Pennsylvanian,Middle Shale,Sandstone,Siltstone,Limestone,Conglomerate CO(wc) Belden Maroon fossils:marine invertebrates GEOLEX link http://ngmdb.usgs.gov/Geolex/NewUnits/unit_8427.html NO cgkn link

Graminia Formation

Up to 18.3 meters of Upper Devonian anhydrite, silt and/or dolomite found in Alberta. It overlies the Calmar Formation/Nisku Formation and is overlain by the Wabamun Group. It may be laterally equivalent to parts of the Calmar/Alexo/Sassenach Formations

Fossils: Marine invertebates locally in carbonates

Grassy Flat

Up to 200 meters of Early Devonian limestone,dolomite,shale,sandstone and breccia found in Utah(n). Overlies the Card Formation and underlies the Samaria Limestone. It is a member of the Water Canyon Formation

Fossils: Probably marine, but apparently no fossils.

Grayling

? Triassic BC Diaber ? fossils:? NO GEOLEX link NO cgkn link

Grays Canyon Limestone

About 90 meters of Lower and Middle Devonian sandy limestone found in Nevada(c). It overlies the Beacon Peak Dolomite and is overlain by the Sentinel Mountain Dolomite. It is a member of the Nevada Limestone

Fossils: Locally abundant marine invertebrates

Great Blue Limestone

Up to 1100 meters of gray Upper Mississipian limestones found in Idaho and Utah. Overlies the Humbug Formation and is overlain by the Manning Canyon Shale It includes the Topliff,Paymaster, Chiulos and Poker Knoll formations.

Fossils: bivalves, crinoids, brachiopods

Grizzly Bear

256 meters of Middle Devonian limestone and dolomite found in the Northwest Territories. It overlies the Arnica Formation and is overlain by the Funeral Formation Not to be confused with the Cretaceous Grizzly Bear member of the Judith River Formation in Alberta and Saskatchewan.

Fossils: Marine invertebrates?

Grondale Formation

35 meters of Silurian sandstone,siltstone,limestone and dolomite found in Montana and North Dakota It overlies the Cedar Lake Formation and is overlain by the Mendenhall Formation It is a member of the Interlake Group

Fossils: Unknown. The formation is marine transitioning upward toward overlying freshwater or subarial beds.

Gros Ventre Formation

About 250 meters of Middle and Upper Cambrian shales and sandstones found in Idaho,Montana, and Wyoming It overlies the Flathead Sandstone and is overlain by the Gallatin Limestone

Fossils: A few trilobite fragments

Grosmont Formation

Up to 230 meters of Devonian limestones or dolomites found (mostly subsurface) in Alberta and the Northwest Territories. It overlays the Duvernay Formation/Ireton Formatiom and is overlain by the Ireton Formation/Nisku Formation

Fossils: None?

Grove Creek Limestone

About 15 meters of Upper Cambrian limestone found in Montana and Wyoming. It overlies the Snowy Range Formation/Sage Limestone/Gros Ventre Formation and is overlain by the Bighorn Dolomite. It is sometimes considered to be a member of the Gallatin Group

Fossils: Crinoid columnals. Enough trilobite fragments for dating.

Guadaloupe Group

Up to 1600 meters thick. A Permian Series/Group found in Texas(w) and New Mexico(e). Consists of the Delaware Mountain Sandstone and the overlying Capitan Limestone It overlies the Hueco Limestone and is the uppermost exposed formation where the Capitan is exposed.

Fossils: Marine invertebrates are present

Guernsey Formation-Wyoming

65 meters of Upper Devonian/Lower Mississippian limestone,sandstone,and quartzite found in South central Wyoming where it is used for beds underlying the Carboniferous Hartville Formation. Equivalent to the sequence Fremont Canyon Sandstone,Englewood Formation, and the lower part of the Madison Limestone. Not the equivalent of the Guernsey Formation found in Montana and North Dakota

Fossils: Marine invertebrates in the middle sandstone.

Guernsey Dolomite

Up to 11 meters of Silurian dolomite and anhydrite found in Montana, North Dakota(nw) where it overlies the Fife Lake Formation and is overlain by the Cedar Lake Formation. It is a member of the Interlake Group. Not the equivalent of the Guernsey Formation in Wyoming.

Fossils: A few ichnofossils.

Guilmette Limestone

Up to 400 meters of Middle and Upper Devonian limestone,sandstone,and dolomite found in Utah and Nevada. It overlies Simonson dolomite/Indian Ranch Formation and underlies the Madison limestone/Cove Fort Quartzite/Tripon Pass Limestone/Pilot Shale.

Fossils: some fossils near the base - corals, stromatoporids

Gull Lake

400 meters of Cambrian slate, siltstone and minor limestones and sandstones found in British Coumbia, the Northwest Territories and Yukon Territory. It overlies the Narchilla Formation and is overlain by the Rabbitkettle Formation/Elmer Creek Formation/Old Cabin Formation

Fossils: ichnofossils

Gunsight Limestone

12m Pennsylvanian,Upper shale,limestone TX(c) South Bend Wayland fossils:marine invertebrates-corals,brachiopods GEOLEX link NO cgkn link Cisco

Gunsteel

Middle Devonian to Lower Mississippian silaceous and carbonaceous shales, siltstone, sandstone found in British Columbia. It is a member of the Earn Group. It is laterally equivalent to the Warneford and Akie formations

Fossils: None?

Gym Limestone

Up to 300 meters of Pennsylvanian/Permian limestone and dolomite found in New Mexico(sw) and Texas(w). Overlies the El Paso Group/Montoya Group and is overlain by the Lobo Formation

Fossils: a few brachiopods, gastropods, pelecypods, and crinoids

Gypsum Spring

122m Jurassic,Middle sandstone,gypsum,claystone,limestone ID(se)/MB/MT/SD(w)/SK(se)/UT(ne)/WY Chugwater Formation Sundance Piper/Watrous/Gravelbourg fossils:very sparse marine invertebrates? GEOLEX link cgkn link Twin Creek

Hachita

120 meters of cherty crinoidal Mississippian limestone found in Arizona and New Mexico. It overlies the Fusselman Dolomite/Keating Formation and is overlain by the Paradise Formation. It is a member of the Escabrosa Group

Fossils: corals, blastoids, brachiopods, forams, disarticulated crinoids

Hackberry Shale

6m Permian shale KS Day Creek Cloud Chief fossils: GEOLEX link NO cgkn link Taloga

Hailstone Formation

190 meters of Lower Devonian limestone and black shale found in the Northwest and Yukon Territories. It overlies the Duo Lake Formation. It is laterally equivalent to the Sapper Formation/Grizzly Bear/Misfortune Formation

Fossils: Marine invertebrates (fairly abundant in the limestones)

Halfway_Canada

1569m Triassic,middle sandstone AB(nw),BC(ne) Doig Charlie Lake Liard/Sulphur Mountain fossils:fish,mollusks(fragments),crinoids NO GEOLEX link cgkn link

Halgaito

244m Permian,Lower sandstone,shale AZ(ne),CO(sw),NM(nw),UT(se) Rico Cedar Mesa Supai/Hermit fossils:? GEOLEX link http://ngmdb.usgs.gov/Geolex/NewUnits/unit_8304.html NO cgkn link Cutler

Halfway

? Oligocene ? UT(ne) Diaber/Schooler Creek fossils:? GEOLEX link NO cgkn link Duchesne River

Hambre

152m Miocene sandy silt CA(Wc) Tico Briones fossils:marine vertebrates GEOLEX link NO cgkn link Monterey

Hamburg Formation

An obsolete name that apparently corresponds to the modern Cambrian age Nopah Formation The basal Dunderberg Shale was removed from the formation leaving the Hamburg Limestone which was later divided into the Halfpint Formation and the Hamburg Dolomite which was then renamed as the Smokey Dolomite. It presumably overlay the Bonanza King Formation and was overlain by the Pogonip Group.

Fossils: trilobites,brachiopods,algal remains, etc

Halfpint limestone

Up to 330 meters of Upper Cambrian Limestone found in California and Nevada. It overlies the Dunderberg Shale and is overlain by the Smokey Limestone. It is the middle member of the Nopah Formation.

Fossils: trilobites, others

Hamill Group

Several hundred meters of Proterozoic and Lower Cambrian quartzite, sandstone, limestone, schist found in British Columbia. It overlies the Horsethief Creek Formation and is overlain by the Badshot Limestone/Milford Group

Fossils: None

Hanauer Quartzite

146 meters of Devonian dolomite,quartzite,and limestone found in Nevada and Utah. It overlies the Gilson dolomite and is overlain by the Madison Limestone

Fossils: brachiopods, pelecypods, gastropods

Hanna Valley

61m Pennsylvanian clay,sandstone TX(c) Cottonwood Creek Rough Creek fossils: GEOLEX link NO cgkn link Strawn

Hannan

200m Mississippian limestones AB,MT(nw),SK Sawtooth Madison fossils:crinoids,corals,brachiopods GEOLEX link NO cgkn link Madison obsolete term for a portion of the Madison Group

Hanson Creek

130 meters of Middle Ordovician through Lower Silurian carbonates found in Idaho and Nevada. It overlies the Eureka Quartzite and is overlain by the Roberts Mountains Formation

Fossils: Abundant (fragmented?) marine invertebrates in some beds. Trilobites, cephalopods, brachiopods

Harding sandstone

Up to 50 meters of Middle Ordovician sandstone/Quartzite found in Colorado(c). Overlies Precambrian metamorphics/Peerless Formation/Manitou Limestone/Idaho Springs and is overlain by the Fremont Limestone

Fossils: Porifera, brachiopods, gastropods, pelecypods, cephalopods, trilobites, fish plates, conodonts

Hare Indian Formation

Up to 332 meters of Upper Devonian shales with thin limestones found in The Northwest and Yukon Territories. It overlies the Hume Formation and is overlain by the Ramparts Formation. It is laterraly equivalent to the Evie, Otter Park, and Ogilvie Formations.

Fossils: Marine invertebrates - brachiopods, tentaculitids

Harkless Formation

Lower Cambrian shales, siltstones, limestone and quartzites found in the area of the Inyo,White,and Silverpeak ranges in California and Nevada. It overlies the Poleta Formation and is overlain by the similar Saline Valley Formation. It is part of a thick sequence of Middle Cambrian, Lower Cambrian and late Proterozoic shelf sediments with different nomeclature than the corresponding nearer shore sediments found further East.

Fossils: Diverse trilobites and other fossils in a few beds.

Harper

60m? Permian,Lower shale,sandstone KS,NE,OK Wellington/Sumner Salt Plain Enid fossils: GEOLEX link NO cgkn link Nippewalla

Harpersville

84m Pennsylvanian,Upper-Permian,Lower shale,limestone,sandstone,coal TX(c) Breckenridge Camp Creek fossils:marine invertebrates GEOLEX link NO cgkn link Cisco

Harrisite Dolomite

55 meters of black, sandy Middle Silurian dolomite found in UT(nw). It overlies the Bell Hill Dolomite and underlies the Lost Sheep Dolomite

Fossils: Poorly preserved marine invertebrates -- corals, brachiopods, crinoids, etc

Harrogate Limestone

118 meters of Middle Devonian limestones, dolomites, shaley limestones found in SouthEast British Columbia. It overlies the Cedared Formation and is overlain by the Fairholme Group It is laterally equivalent to the Mount Forster, Elk Point, and Dunedin Formations.

Fossils: Marine invertebrates - Corals, stromatoporoids, brachiopods, cephalopods, echinoderm fragments, trilobites, conodonts, gastropods, bivalves, sponge spicules.

Hartville

300 meters or more of Pennsylvanian sandstone, quartzite, and limestone found in Nebraska and Wyoming(se). It overlies the Guernsey Limestone and is overlain by unspecified Permian beds. It is subdivided into various members and formations: Broom Creek,Cassa,Darwin Sandstone,Fairbank,Hayden Member,Meek,Reclamation,Roundtop,Wendover,Owl Canyon,Lyons Sandstone

Fossils: brachiopods, corals, fish teeth, fusilinids, corals, trilobites in various beds

Hayden

Up to 40 meters of silty, dolomitic Middle Pennsylvanian limestone found in Nebraska,North Dakota,South Dakota(sd),Wyoming(se) It overlies the Roundtop Group and is overlain by the Meek Group. It is a member of the Hartville Formation

Fossils: Marine Invertebrates

Hay River Formation

About 400 meters of Middle and Upper Devonian green shales, sandstones and limestones found in Alberta and the Northwest Territories. It overlies the Slave Point Formation and is overlain by the Twin Falls Formation

Fossils: brachiopods

Haywire

thick Cambrian,Upper,Silurian-Lower dolostone,volcanics NT VampireNT/Sekwi/Rockslide/Avalanche/Broken Skull| Funeral/Grizzly Bear/Sapper| Rabbitkettle/Broken Skull/Sunblood/Whittaker fossils-conodonts,a few corals NO GEOLEX link cgkn link

Hazel

610m? Precambrian sandstone,conglomerate TX(w) Allamoore Van Horn fossils: GEOLEX link NO cgkn link

Heath Shale

Up to 150 meters of black Upper Mississippian shale, claystone, sandstone, limestone, gypsum, coal found in Montana and North Dakota. Includes the Bear Gulch Sandstone. It overlies the Otter Formation and is overlain by the Cameron Creek Formation/Amsden Group. It is a member of the Big Snowy Group

Fossils: Abundant in the limestones. Abundant conodonts in shale. brachiopods

Harrisburg

80 meters of Lower Permian limestone, shale, chert and gypsum found in Nevada(ec),Utah(sw),and Arizona(nw). It overlies the Fossil Mountain Limestone and is overlain by the Moenkopi Formation. It is the upper member of the Kaibab Formation

Fossils: brachiopods, gastropods

Hart River

366m Middle Mississippian silty limestones YU ? Ettrain Alapah/Calico Bluff fossils: marine invertebrates GEOLEX link cgkn link

Hartmann Limestone

200 meters of gray Middle Cambrian limestone with minor sandstone found in northwest Utah. It overlies the Ophir Formation and is overlain by the Bowman Limestone

Fossils: A few fossils

Hartville Formation

About 300 meters of Pennsylvanian sandstone and limestone found in Nebraska and SouthEast Wyoming. Overlies the Guernsey formation and is overlain by the Opeche shale. Laterally equivalent to the Amsden and Minnelusa formations

Fossils: Marine invertebrates-brachiopods, trilobites, conodonts, corals, bryozoans, and fusulinids. Fish teeth.

Hasmark Dolomite

Up to 1000 meters of Middle/Upper Cambrian limestone/dolomite found in Montana(sw). It overlies the Silver Hill formation/Flathead Sandstone and is overlain by the Red Lion Formation.

Fossils: A few brachiopods in some beds.

Hazelton

thick Jurassic volcanics,shales,sandstones AK(se),BC Bear River Skeena fossils:? GEOLEX link cgkn link Hazelton

Headless Formation

302 meters of Middle Devonian Limestone and calcaerous shale found in the Northwest Territories It overlies the Manetoe/Funeral/Landry Formations and is overlain by the Nahanni Formation.

Fossils: Marine invertebrates

Hector Formation

550 meters of Late Proterozoic colored slates, sandstone, limestone and conglomerate found in Alberta. It overlies the Corral Creek Formation and is overlain by the Gog Group. Not to be confused with the Miocene age Hector Formation found in California

Fossils: None

Hector Sandstone

About 300 meters of Lower Miocene sandstones,tuff,and conglomerate. It overlies unnamed volcanic beds and is overlain by Pleistocene alluvial deposits

Fossils: Mammals

Hells Canyon

About 50 meters of Pennsylvanian conglomerate,limestone,shale, and sandstone found in Colorado(nw) and Utah(ne). It overlies the Belden formation/Round Valley Formation and is overlain by the Youghall formation/Morgan Formation. It is a member of the Durst Group/Morgan Formation

Fossils: abundant marine invertebrates in the limestones-brachiopods, algae, crinoid fragments, corals, forams

Helms Formation

150 meters of Upper Mississippian shale,shaly limestone,and shaly sandstone found in New Mexico(sc) and Texas(w) It overlies the Canutillo Formation/Rancheria Formation and is overlain by the Bishops Cap Formation. It is a member of the Magdalena Formation.

Fossils: Bryozoa, brachiopods in limestones in upper part of formation

Henderson Canyon Limestone

241 meters of Lower Mississippian limestone found in Idaho(se) and Utah(ne). It is subdivided into the Chinese Wall Limestone, Brush Canyon Limestone, and Devil Creek Limestone

Fossils: brachiopods, corals, foraminifers, conodonts, crinoids

Hennessey

122m Permian,Lower sandstone,shale OK Garber Duncan Harper fossils: GEOLEX link NO cgkn link Enid

Hepler

? Pennsylvanian,Upper sandstone,shale KS,MO Marmaton ? ? ? GEOLEX link NO cgkn link Hepler

Herkimer Limestone

As much as 130 meters of Middle Cambrian limestone and shaly limestone found in Utah(c). It overlies the Dagmar Limestone and is overlain by the Bluebird Dolomite It is a member of the Hartmann Group

Fossils: Very sparse. A few trilobite fragments in shales

Hermit Shale

Up to 300 meters of red Lower Permian shale and sandstone found in Arizona, California, Nevada, and Utah. It overlies the Supai Sandstone and is overlain by the Coconino Sandstone

Fossils: Plants, trackways

Hermosa

About 600 meters of Middle and Upper Pennsylvanian limestone,shale and sandstone found in Arizona(ne), Colorado(sw), New Mexico(nw), and Utah(se). It overlies Devonian beds/Molas Formation/Paradox Formation and is overlain by the Rico Formation/Cutler Formation

Fossils: marine invertebrates in the limestones and some shales. (brachiopods-forams-bivalves-gastropods).

Hickory

244 Cambrian,Upper sandstones TX(c) ? Cap Mountain Reagan fossils:marine invertebrates? GEOLEX link NO cgkn link Riley

Hicks Formation

Up to 400 meters of fossiliferous Upper Cambrian dolomite,sandstone,and limestone found in Utah. It overlies the Lamb Dolomite and is overlain by the Chokecherry Dolomite

Fossils: Present in limestones and shales

Hidden Valley Dolomite

450 meters or so of gray Silurian and Lower Devonian dolomite with minor chert and siltstone. Overlies the Ely Springs Dolomite and is overlain by the Lost Burro Formation. Found in east central California.

Fossils: Abundant corals and brachiopods. Silurian marine fossils in the lower beds and Devonian in the upper beds

High Creek Limestone

Middle Cambrian limestone with shale partings found in Idaho(se) and Utah(ne). It overlies the Brigham Formation/Spence Shale and is overlain by the Cub Shale

Fossils: Girvanella

Highland Peak Limestone

About 1500 meters of thinly bedded Middle and Upper Cambrian Limestone found in Nevada(ec) and Utah(wc). It overlies the Whirlwind Formation/Chisholm Shale and is overlain by the Mendha Limestone

Fossils: Stromatolites, trilobites, trilobites

Higham Grit

152m Triassic,Upper-Jurassic sandy conglomerate ID,UT,WY Ankareh/Timothy Deadman Limestone Shinarump? fossils:None? GEOLEX link NO cgkn link Nugget

Hodges Shale

110 meters of drab Middle Cambrian clay shale found in Idaho(sc) and Utah(nc). It overlies the Blacksmith Limestone and is overlain by the Bloomington Limestone. It is a member of the Bloomington formation.

Fossils: trilobite fragments. brachiopods

Hog Creek

21m Pennsylvanian,upper clay,sandstone,conglomerate TX Ranger Home Creek Colony Creek fossils:sparse marine invertebrates GEOLEX link NO cgkn link Canyon

Hogan

229m Pennsylvanian,Middle limestones,siltstone NV(ec),UT(wc) Ely Ferguson Mountain,Riepe Spring fossils:crinoid stems,brachiopods,corals,gastropods,bryozoans,fusulinids GEOLEX link NO cgkn link

Holder Formation

260 meters of Upper Pennsylvanian limestone,shale,sandstone,and conglomerate found in New Mexico(sc). It overlies the Beeman Formation and is overlain by the Bursum Formation. It is laterally equivalen to the Panther Seep Formation It is a member of the Magdalena Group

Fossils: Algal bioherms 30 meters thick in basal limestone

Hollebeke Limestone

240 meters of Middle and Upper Devonian limestone,dolomite,anhydrite found in Alberta(sw) and British Columbia(se) It overlies Windsor Mountain/Elko/Purcell Supergroup/ordovician strata. It is overlain by the Borsato Formation.

Fossils: Unknown

Holmes River Shale

Proterozoic and Lower Cambrian shale found in British Columbia. It is a member of the McNaughton Formation

Fossils: None? Ichnofossils?

Home Creek Limestone

15m Pennsylvanian,upper limestone,clay,shale,sandstone TX(n) Hog Creek Bluff Creek fossils:marine invertebrates GEOLEX link NO cgkn link Canyon

Homestake

152m Jurassic? limestone UT(sw) Entrada ? fossils:bivalves(uncommon) GEOLEX link] NO cgkn link Carmel/San Rafael Not to be confused with the Proterozoic Homestake formation in South Dakota

Honaker Trail

533m Pennsylvanian,Middle-Pennsylvanian-Upper limestone,sandstone,shale AZ(ne),CO(sw),NM(nw),UT(se) Horn Point/Paradox Rico/Cutler/Elephant Canyon Madera/Supai/Gothic/Maroon fossils:marine invertebrates GEOLEX link http://ngmdb.usgs.gov/Geolex/NewUnits/unit_8524.html NO cgkn link Hermosa

Hondo Sandstone

15+ Permian,Lower rocks NM(se) Yeso Formation San Andreas fossils:? GEOLEX link cgkn link Hondo

Hondo (Canada)

140m Devonian,Upper dolomite,anhydrite,shale AB Grosmont Nisku Formation Grosmont fossils:? NO GEOLEX link cgkn link

Honeycut

207 Ordovician,Lower limestone,dolomite TX(c) Gorman Burnam/Stribling fossils: GEOLEX link NO cgkn link Ellenburger

Horn Plateau Limestone

Up to 84 meters of Middle Devonian reef complex limestones found in the Northwest Territories. It overlies the Lonely Bay Formation and is overlain by the Horn River Formation with which it is laterally equivalent

Fossils: diverse marine invertebrates - brachiopods, bryozoa, corals, crinoids, gastropods, ostracodes, pelecypods, stromatoporoids, trilobites.

Horn Point

? Pennsylvanian,Middle limestone UT(se) ? Honaker Trail ? fossils:None? GEOLEX link 15286 NO cgkn link

Horn River Formation

320 meters of Middle and Upper Devonian limestones and multi-colored shales found in Alberta, British Columbia, and the Northwest Territories. It overlies the Lonely Bay/Nahanni/Pine Point/Hume Formations and is overlain by the Fort Simpson Formation. It is laterally equivalent to the Slave Point Fm/Hay River Fm/Horn Plateau formations. It is sometimes considered to be a Group consisting of the Hare Indian Formation,Ramparts Formation,Canol Formation,Evie Formation,Muskwa Formation,Spence River Formation

Fossils: Brachiopods, conodonts, tentaculitids

Horquilla Limestone

Up to 400 meters of Lower and Middle Pennsylvanian gray and brown crinoidal limestone found in Arizona(s) and New Mexico(sw) It overlies the Black Prince Limestone/Escabrosa Formation and is overlain by the Earp Formation. It is a member of the Naco Group

Fossils: crinoid fragments, brachiopods, corals, forams

Horse Creek

46m Pennsylvanian shale,clay TX(c) Fox Ford Bull Creek fossils: GEOLEX link NO cgkn link

Horseshoe Shale

100 meters of red Late Mississippian and Early Pennsylvanian shale,siltstone,sandstone and limestone found in North Central Wyoming. It overlies the Madison Limestone/Darwin Sandstone and is overlain by the Ranchester Limestone/Moffat Trails Formation. It is a member of the Amsden Group Fossils:

Horseshoe Mesa

Up to 50 meters of red to gray thick bedded Upper Mississippian marine limestone,dolmite,and chert found in Arizona(nc) and Utah(sc). It overlies the Mooney Falls Formation and is overlain by the Supai Formation/Molas Formation. It is a member of the Redwall Limestone

Fossils: well preserved marine invertebrates

Horseshoe Mountain Group

Up to 235 meters of Upper Cambrian and Lower Ordovician sandstone,shale,limestone,and dolomite found in Colorado(c). It includes the Dotsero Formation,Manitou Limestone,Peerless Formation, and Sawatch Sandstone.

Fossils: Marine invertebrates in some beds

Horsethief Creek Group

Up to 8500 meters of Late proterozoic slate, quartzize, conglomerate, and limestone found in British Columbia and Washington. It overlies the Toby Formation and is overlain by the Hamill Group/Cranbrook Formation/Jubilee Formation/Ottertail Formation. It is the upper member of the Windermere SuperGroup.

Fossils: Stromatolites in some of the carbonates

Horsetown

3810m Cretaceous,Lower siltstone,shale,sandstone,limestone, CA(nw) Paskenta Chico fossils:marine invertebrates GEOLEX link NO cgkn link There may be a Horsetown Formation in AB

Hota-Adolphus Limestone

Hota

244 meters of massive Lower Cambrian limestone found in Alberta and British Columbia. it overlies the Mahto Formation and is overlain by the Chetang Formation. Modern usage is to use the name Hota for this formation, but some earlier authors used the name Adolphus (and misdated the beds as Upper Cambrian?]

Fossils: Scattered trilobites

House Limestone

Up to 140 meters of thin bedded, cherty Lower Ordovician Limestone found in West Central Utah. It overlies the Notch Peak Formation and is overlain by the Fillmore Limestone. It is basal member of the Pogonip Group.

Fossils: trilobites, brachiopods

Howell Limestone

Up to 255 meters of Middle Cambrian massive limestone with thin bedded shales and limestones found in West Central Utah. It overlies the Pioche Shale/Tatow Formation/Langston Shale/Spence Shale and is overlain by the Chisholm Shale/Dome Limestone

Fossils: trilobites in upper part

Hueco Limestone

Up to 1500 meters of gray Lower Permian Limestone with minor shale and sandstone found in New Mexico(sc) and Texas(w). It overlies the Van Horn Formation/Fusselman limestone/Montoya Formation/Magdalena/Abo Formation and is overlain by the Delaware Mountain Formation/Wilkie Ranch/Cretaceous beds.

Fossils: Marine invertebrates

Humbug Formation

80 meters of fossiliferous Upper Mississippian limestone and sandstone. It is found in Colorado(nw),Idaho(sc),Utah(n),and Wyoming(sw). It overlies the Godiva limestone/Pine Canyon Limestone/Deseret Limestone/Uinta Mountain/Madison Limestone and is overlain by the Great Blue Limestone/Doughnut Formation/Round Valley Limestone

Fossils: crinoids, corals, brachiopods

Hume Limestone

160 meters of Upper Devonian limestones found in the Northwest Territories. It overlies the Landry, Gossage and Bear Rock formations and is overlain by the Hare Indian shale. Not to be confused with the Devonian Hume Shale of Western New York.

Fossils: well preserved brachiopods, corals, conodonts, trilobites

Hunt Fork Shale

952 meters of Upper Devonian shale,slate,sandstone and siltstone found in Alaska(n). It overlies Middle Devonian metasediments and is overlain by the Kanayut Conglomerate It is a member of the Endicott Group

Fossils: brachiopods, pelecypods, gastropods, and fish teeth

Hunton Limestone

135m Silurian limestone AR,IL,KS,KY,MO,OK,TX Sylvan Woodford Shale fossils:marine invertebrates GEOLEX link NO cgkn link Hunton

Hyland Group

? Proterozoic-Cambrian Lower grits,shales AK,BC,NT,YU ? Gull Lake #GullLake Yusezyu-Narchilla ichnofossils NO GEOLEX link [http://weblex.nrcan.gc.ca/html/006000/GSCC00053006878.html]

Hyndman

1220m Precambrian? quartzite,schist ID(sc) East Fork fossils: None? GEOLEX link NO cgkn link

Hyrum Formation

Up to 500 meters of Middle and Upper Devonian limestone found in Idaho(se) and Utah(n). It overlies the Grassy Flat Formation/Samaria limestone/Water Canyon Formation/Laketown Formation and is overlain by the Beirdneau Formation. It is a member of the Jefferson Dolomite

Fossils: corals, brachiopods, stromatoporoids

Idaho Springs

Precambrian metasediments found in Colorado(c). It underlies the Fountain Formation The name is very likely applied to several different metamorphic assembleges underlying Paleozoic rocks in different areas of Colorado

Fossils: None

Ignacio

60 meters of Upper Cambrian quartzite and shale found in Arizona,Colorado,New Mexico, and Utah. It underlies the Ouray Formation/Elbert Formation/Tintic Formation. It is laterally equivalent to the Tintic Formation

Fossils: A few poorly preserved fossils.

Illipah

? Mississippian,Upper(Eocene?) shale,sandstone,conglomerate NV(ec) Chainman Shale,Rogers Spring Limestone,Monte Cristo Ely,Callville,Bird Spring Scotty Wash,Diamond Peak,Chainman fossils:? GEOLEX link NO cgkn link

Imnaitchiak Chert

76 meters of Lower Pennsylvanian to mid-Mesozoic(?) chert, mudstone, and shale found in Alaska(n). It overlies the Akmalik Chert and underlies the Okpikruak Formation. It is a member of the Etivluk Group.

Fossils: Radiolarians

Imperial Formation

1850 meters Upper Devonian to Lower Mississippian shales and sandstones found in the Northwest(nw) and Yukon(n) Territories. It overlies the Canol Formation/Prongs Creek. It is overlain be various Upper Paleozoic and Mesozoic beds. It is laterally equivalent to the Crystal Peak/Kanayut/Nation River Formations. Not to be confused with the Miocene/Pliocene Imperial Formation in California(sc). It was originally known as the Bosworth Formation.

Fossils: A few marine invertebrates in lower limestones -brachiopods, corals, crinoids, a few ammonoids, ostracodes, pelecypods and conodonts. -- Ichnofossils, plants

Index

Early Paleozoic (Cambrian?-Devonian?) beds found in British Columbia(se). It is overlain by the Triune Formation. It is a member of the Lardeau Group -- a sequence of unfossiliferous clastic sediments found in the Kootenay Terrane whose age is constrained by Lower Cambrian and Mississippian fossils in underlying and overlying beds.

Fossils: Unknown

Indian Creek

? Pennsylvanian shale,sand,clay TX(c) Comanche Creek/Antelope Creek Ricker Wildcat Creek fossils:? GEOLEX link NO cgkn link Strawn

Indian Ranch Limestone

150 meters of gray/yellowish gray, nodular Late Devonian limestone found in Nevada(ec). It is treated as the upper Tongue of the Guilmette Formation. It overlies the Pilot Shale and is overlain by the Joana Limestone. It is similar to and time equivalent to the West Range Formation

Fossils: Conodonts. Brachiopods are reported from the similar West Range Limestone

Ingenika Group

1100m+ Proterozoic,Upper limestone,dolomite,shale,sandstone BC(nc) underlyingis Atan Windermere/Misinchinka/Horsethief Creek/Kaza/Isaac/Cunningham/Yankee Belle/Miette/Byng fossils:none? NO GEOLEX link cgkn link Ingenika

Ingleside

lower Permian sandstone,limestone, and a few evaporates at some exposures found in Colorado(ne) and Wyoming(se). It overlies the Fountain Formation and is overlain by the Lykins Formation/Satanka Formation

Fossils: Unknown

Ingta Formation

256m Proterozoic-Cambrian Lower shale,sandstone,limestone NT,NU,YT Risky Backbone Ranges ichnofossils NO GEOLEX link cgkn http://weblex.nrcan.gc.ca/html/006000/GSCC00053006968.html Windermere Group

Inkom

300 meters of late precambrian siltstone, shales, sandstones, and slates found in Idaho(se) and Utah. It overlies the Caddy Canyon Quartzite and is overlain by the Mutual Quartzite. It is a member of the Brigham Group

Fossils: None?

Interlake Group

Upper Ordovician and Lower Silurian marine and fresh water limestones and dolomites found in Wyoming,Montana,North Dakota,South Dakota, Saskatchewan and Manitoba. It overlies the Stony Mountain Formation/Bighorn Dolomite/Stonewall and is overlain by the Duperow Formation/Jefferson Formation/Ashern Formation In the West, the Interlake Group includes the Cedar Lake Formation,Fife Lake Formation,Grondale Formation,Guernsey Formation,Mendenhall Formation,Missouri Breaks Formation,Sherven Formation,and Strathclair Formation. The Interlake is one of the few formations recognized in both the Eastern and Western segments of the continent.

Fossils: Poorly preserved

Inwood Formation

13 meters of Lower Silurian dolomite and limestone found in Manitoba(wc) It overlies the Fisher Branch dolomite and is overlain by the Moose Lake dolomite. Not to be confsed with the Ordovician Inwood Marble encountered in New York City and adjacent Connecticut. It is a member of the Interlake Group

Fossils: stromatolites, marine invertebrates

Ireton Formation

Up to 250 meters of Upper Devonian shale and limestone found in Alberta and Saskatchewan. It overlies the Duvernay Formation and is overlain by the Nisku Limestone/Winterburn Shale

Fossils: ostracods, crinoids, gastropods, bryozoa, corals and brachiopods, conodonts, tentaculitids and forams

Iron Mountain

30m Silurian,Lower conglomerate MO(sc) LaMotte fossils:? GEOLEX link NO cgkn link

Iron Springs

914m Cretaceous,Upper Conglomerate,Sandstone,Limestone,Shale,coal UT(sw) Entrada Claron fossils:plant pollen GEOLEX link NO cgkn link

Ironside Formation

250 meters of Late Miocene or Pliocene streamside and lakebed sediments found in Oregon(e).

Fossils: Mammals, plants, fish

Isaac

2500 meters of Upper Proterozoic shale and sandstone found in British Columbia(ec) It is overlain by the Cunningham Formation and is a member of the Cariboo Group

Fossils: None?

Ishbel Group

427m Permian rock_types AB,BC Tunnel Mountain Spray River ./MIDCONT.HTM#SprayRiver | [Belcourt,Johnston Canyon,Telford,Ross Creek,Ranger Canyon,Mowitch Formations/Phosphoria Formation marine invertebrates-brachiopods,fusulinaceans,corals,bryozoa,crinoids,Helicoprion NO GEOLEX link [http://weblex.nrcan.gc.ca/html/007000/GSCC00053007039.html]

Itkilyariak Formation

150 meters of Upper Mississippian Sandstone,Redbeds,Conglomerate,Breccia,Limestone, and shale found in Alaska(n). It overlies the Kayak/Kekiktuk Formations and is overlain by the Alapah Limestone. It is a member of the Endicott Group

Fossils: Sufficient for dating the formation.

Ivan Limestone

2m Pennsylvanian,Upper rocks TX(cs) Avis Blach Ranch fossils:locally abundant marine invertebrates GEOLEX link cgkn link Cisco

Jacalitos

975 Miocene-Pliocene sandstone,conglomerate,shale CA(wc) ? Etchegoin Santa Margarita fossils: marine invertebrates,petrified wood,leaves GEOLEX link: NO cgkn link Etchegoin

Jacksboro

18m Pennsylvanian,Upper limestone,shale,sandstone TX(c) Eastland Bunger fossils:corals GEOLEX link NO cgkn link Cisco

Jangle Limestone

90 meters of Middle Cambrian limestones,mudstones,wackestones found in Death Valley and adjacent Nevada. It overlies the Chisholm Shale/Pahrump Hills Shale and is overlain by the Desert Range Limestone. It is a member of the Carrara Formation and is laterally equivalent to parts of the Cadiz Shale and [Pioche].

Fossils: fragments of trilobites, echinoderm fragments, algal masses

Jasper Creek

27m Pennsylvanian,Upper shale,sandstone TX(nc) Rock Hill Devils Den fossils:plants,a few marine invertebrates, fish teeth GEOLEX link NO cgkn link Graford/Canyon

Joaquin Miller

? Cretaceous,Upper ? CA(wc) Knoxville ? fossils:? GEOLEX link NO cgkn link

Jefferson Dolomite

As much as 800 meters of dark Middle and Upper Devonian Dolomites/Limestones with some shales and sandstones found in Idaho, Montana, Utah. Wyoming, North Dakota and South Dakota. It overlies the Lynch Formation/Devils Glen/Beartooth Butte/Red Lion/Bighorn Dolomite/Hasmark Formation/Maywood/Souris River Formation and is overlain by the Madison Group/Leatham Formation/Three Forks Shale/Beirdneau Formation. It includes the Birdbear Formation, Duperow Formation, Nisku Formation, Coopers Lake Member, Glenn Creek Shale, Hyrum Dolomite, Lone Butte Member, Samaria Limestone Member, Spotted Bear Member, and White Ridge Member.

Fossils: often poorly preserved brachiopods, corals, stromatoporoids, crinoids, others in some beds

Jewett Sand

200m Miocene,Lower sand,siltstone CA(sc) Walker/Vedder Freeman Silt fossils:bivalves GEOLEX link NO cgkn link? Not to be confused with undescribed Jewett Formation in BC

Joana Limestone

Up to 300 meters of gray Lower Mississippian limestone found in Nevada(ec) and Utah(w). It overlies the Pilot Shale and is overlain by the Chainman Shale. It is a member of the White Pine Group

Fossils: Varies from sparse to fairly abundant. Crinoid fragments, brachiopods, corals, gastropods, etc

Johnnie Shale

Up to 1300 meters of purplish Ediacaran marine mudstone and shale found in the SouthWestern Great Basin and adjacent Mojave Desert. It overlies the Noonday Dolomite and is overlain by the Stirling Quartzite

Fossils: Possibly present but obscure? e.g tiny structures theat might be metazoan coprolites.

Johnston Canyon

47m Permian cyclic siltstones,limestones,chert Alberta(sw),British Columbia(se) Kananakis,Tunnel Mountain Ranger Canyon Belloy fossils:ichnofossils,a few fusilinids,conodonts NO GEOLEX Entry cgkn http://weblex.nrcan.gc.ca/html/007000/GSCC00053007213.html

John Day

1524m Eocene-Miocene tuff,gravel,sand,lava OR(ne) Clarno volcanics fossils:plants,vertebrates GEOLEX link NO cgkn link

Jones Ridge Limestone

915m Cambrian-Ordovician limestone AK(ec),YU Tindir Group ? marine invertebrates GEOLEX http://ngmdb.usgs.gov/Geolex/NewUnits/unit_5687.html cgkn http://weblex.nrcan.gc.ca/html/007000/GSCC00053007232.html

Jornada Limestone

320 meters of Upper Ordovician limestone found in New Mexico. It overlies the Cable Canyon Sandstone and is overlain by the Fusselman Formation. A member of the Montoya Group

Fossils: Unknown-Marine invertebrates?

Jowett

Early Paleozoic (Cambrian-Devonian?) found in British Columbia (se). It overlies the Sharon Creek Formation and is overlain by the #Broadview Formation It is a member of the Lardeau Group -- a sequence of unfossiliferous clastic sediments found in the Kootenay Terrane whose age is constrained by Lower Cambrian and Mississippian fossils in underlying and overlying beds.

Fossils:None?

Juab Limestone

Up to 42 meters of Lower (or Middle?) Ordovician Limestone. It is found in Western Utah and Eastern Nevada. It overlies the Wah Wah Limestone and is overlain by the Kanosh Shale. It is a member of the Pogonip Group

Fossils: abundant fossils

Jubilee

As much as 1180 meters of Cambrian dolomites found in British Columbia (SE). It overlies the Purcell Croup as well as Lower Cambrian rocks and is overlain by the McKay Group

Fossils: None

Jungle Creek

429m Permian? limestone,shale,sandstone YT Ettrain [Tahkandit #Tahkandit fossils:brachiopods,forams,ammonites,trilobites,others NO GEOLEX link cgkn link http://weblex.nrcan.gc.ca/html/007000/GSCC00053007270.html

Kaibab

Up to 290 meters of Lower Permian limestone(marble),shale, and sandstone found in Arizona(n),Nevada(ec),California(se),Utah(S). Sometimes broken into Fossil Mountain and Harrisburg members. It overlies the Coconino sandstone and is overlain by the Moenkpie Formation. Originally assigned to the Aubrey Group

Fossils: abundant corals, brachiopods, mollusks

Kaiparowits

671m Cretaceous,Upper Sandstone,Conglomerate,Shale,Limestone UT(sc) Wahweap Wasatch/Cedar Breaks fossils:bivalves-Ostrea,petrified wood,vertebrates GEOLEX link NO cgkn link

Kakisa Limestone

57 meters of bioclastic Upper Devonian limestones found in British Columbia(ne) and the Northwest Territories(w). It overlies the Redknife Formation/Fort Simpson Formation and is overlain by the Trout River Formation. It is laterally equivalent to parts of the Winterburn Group/Southesk Formation/Fort Simpson Formation

Fossils: Corals, stromatoporoids, other marine invertebrates(?)

Kalzas Limestone

About 330 meters of Lower Mississippian limestone found in the Northwest Territories. It overlies the Crystal Peak Formation and is overlain by unnamed Earn Group beds. It is a member of the Earn Group

Fossils:

Kangaroo

Obsolete term for as much as 950 meters of Pennsylvanian and Permian shale, conglomerate and quartzite found in Colorado now assigned to the Belden and Minturn Formations. Presumably it overlies the Leadville Limestone and is overlain by the Upper part of the Minturn Formation

Fossils: Marine invertebrates?

Kanosh Shale

Up to 170 meters of Lower and Middle Ordovician Shales, siltstones and limey shales with calcearous beds at the top. It is found in Western Utah and Eastern Nevada. It overlies the Juab Limestone and is overlain by the Lehman Formation. It is a member of the Pogonip Group

Fossils: brachiopods, ichnofossils, etc.

Kasiska Quartzite

Late proterozoic(?) quartzite and siltstone found in Idaho(se). It underlies the Windy Pass Formation. It is a member of the Brigham Quartzite.

Fossils: None

Kananakis

Fossils:
37m? Pennsylvanian mudstones,dolomitic sandstones Alberta(sw),British Columbia(se)? unknown Johnston Canyon unknown fossils:nautiloids NO GEOLEX link NO cgkn link

Kanayut Conglomerate

1000 meters of Upper Devonian and Lower Mississippian shale and conglomerate found in Alaska(n) It overlies unnamed shales and is overlain by the Kayak Shale It is a member of the Endicott Group

Fossils: Plants?

Kayak Shale

292 meters of Lower Mississippian shale, sandstone, and limestone found in Alaska(n). It overlies the Kanayut conglomerate and is overlain by the Wachsmuth limestone. It is a member of the Endicott Group

Fossils: corals,echinoderm,bryozoa,brachiopods

Kayenta

190m Triassic,Upper-Jurassic,Lower sandstone,shale AZ(n),CO(sw),NV(e),UT(s) Wingate/Moenave Navajo Todilto freshwater mollusks,reptiles GEOLEX link NO cgkn link Glen Canyon

Keating

230 meters of Lower Mississippian limestone found in Arizona(se) and New Mexico(sw). It overlies the Portal Formation(?)/Percha Formation and is overlain by the Hachita Formation. It is a member of the Escabrosa Limestone

Fossils: fairly abundant in some beds, but often fragmental-corals, foraminifers, blastoids, and brachiopods

Kee Scarp

Up to 180 meters of Upper Devonian limestone with shale partings found in the Northwest and Yukon Territories. It may overlie the Ramparts Formation It is probably laterally equivalent to parts of the Fort Creek/Ramparts/Beavertail Formations

Fossils: Stromatoporoids, a few corals and brachiopods

Keele

Cambrian and older cyclic shale, sandstone, siltstone, limestone beds found in the Yukon and Northwest Territories. It is overlain by the Sheep Bed Formation/Gull Lake Formation

Fossils: None?

Keg River

As much as 300 meters of Upper Devonian dolomites and limestones found in Alberta(n). It overlies the Chinchaga Formation and is overlain by the Muskeg Formation. It is laterally equivalent to the Winnipegosis/Pine Point/Hume/Nahanni Formations

Fossils: sometimes abundant Crinoids,brachiopods,ostracodes,gastropods,corals,tentaculitids,bryozoa,stromatoporoids

Kekiktuk Conglomerate

122 meters of Upper Devonian and/or Mississippian Conglomerate,sandstone and coal(?) found in in Alaska(n) and the Yukon Territory. It overlies the [Neruokpuk Formation #Neruokpuk ] and is overlain by the Kayak Shale It is a member of the Endicott Group

Fossils: Ambiguous plant fragments

Kelley Canyon

Up to 575 meters of late Proterozoic shale, siltstone, sandstone and dolomite found in Utah(w) It overlies the Dutch Peak Tillite/Maple Canyon Formation. It is overlain by the Caddy Canyon Formation It is a member of the Sheeprock Group

Fossils: None

Kennett

122m+ Devonian-Lower-Devonian,Middle shale,sandstone,limestone CA(nw) volcanics Bragdon fossils:abundant marine invertebrates GEOLEX link| cgkn link group

Kerber Formation

65 meters of Lower to Middle Pennylvanian sandstone and shale found in Colorado(sc). It overlies the Leadville Limestone and is overlain by the Maroon Formation/Deer Creek Formation

Fossils: plants in the shales

Kechika

600 meters of Upper Cambrian/Lower Ordovician shale/phyllite/siltstone/limestone found in British Columbia(ne). It overlies the Rosella Formation and is overlain by the Skoki Formation

Fossils: Graptolites and a few other marine invertebrates - trilobites,brachiopods,crinoid debris,bryozoa,cephalopods

Kern River

600m+ Miocene-Pleistocene silt,sand,clay,gravel CA(sc) Olcese Sand None fossils:vertebrates,invertebrates,leaves GEOLEX link NO cgkn link Kern River

Kibbey Sandstone

Up to 65 meters of red and yellow clayey Upper Mississippian sandstones with some gypsum found in Montana(c), North Dakota and South Dakota(nw). It overlies the Castle Reef Limestone/Charles Formation/Poplar Interval and is overlain by the Otter Shales/Lombard Formation. It is a member of the Big Snowy Group/Snowcrest Ridge Group/Quadrant Group

Fossils: Sparse -- conodonts, plants

Kindle Formation

200 meters of Pennsylvanian shale, siltstone and silty limestone found in British Columbia and the NorthWest Territories. It overlies the Mattson Formation/Stoddart Group/Prophet Formation and is overlain by the Fantasque Formation/Triassic beds.

Fossils: Brachiopods, echinoderm fragments.

Kingak Shale

1220m Jurassic-Cretaceous,Lower sandstone,shale AK(n),YT Shublik Okpikruak fossils:marine bivalves http://ngmdb.usgs.gov/Geolex/NewUnits/unit_5785.html http://ngmdb.usgs.gov/Geolex/NewUnits/unit_5785.html

Kingston Peak Dolomite

About 1000 meters of heterogeneous Upper Proterozoic beds -- volcanics,shales,limestones,graywacke,glacial debris. It overlies the Beck Spring Dolomite and is overlain by the Noonday Dolomite. It is the uppermost member of the Pahrump Group.

Fossils: stromatolites, diverse microbes

Kinkead Spring Limestone

Up to 220 meters of Lower Mississippian limestone found in North Central Nevada. It overlies the Davis Spring Formation/McMonnigal Limestone and underlies the Antelope Range Formation

Fossils: echinoderm fragments-bryozoa-brachiopods

Kinnikinic Quartzite

About 1000 meters of white Middle Ordovician quartzite with minor shale found in Idaho(c) and Montana. Overlies Ramshorn slate/Ella Dolomite/Summerhouse Formation and is overlain by the Saturday Mountain Formation/Fish Haven Dolomite.

Fossils: Brachiopods, Bryozoa, Crinoids in shales in some areas

Kirkman Formation

Obsolete name for the Permian Freeman Peak and Diamond Creek formations.

Knoxville

3048m? Jurassic,Upper-Cretaceous,Lower shale,sandstone,conglomerate,limestone,coal CA(nw) Franciscan? Joaquin Miller/Chico fossils:marine invertebrates(buchia,belemnites),plants GEOLEX link NO cgkn link

Kogruk

Up to 457 meters of Lower Mississippian to Lower Pennsylvanian limestone and chert found in Alaska(n). It overlies the Utukok formation and is overlain by the Tupik Formation. It is a member of the Lisburne Group.

Fossils: marine invertebrates-mollusks,gastropods,corals,brachiopods

Kotcho formation

210 meters of Upper Devonian shales and limestones found in the Alberta,British Columbia, and the NorthWest Territories. (subsurface only?) It overlies the Tetcho Formation and is overlain by the Exshaw Formation?. It is laterally equivalent to the Besa River Formation

Fossils: brachiopods

Kreyenhagen

46m Eocene,Oligocene shales CA(sc) Avenal Temblor fossils:forms,diatoms,mollusks GEOLEX link cgkn link

Kuna

30 meters Upper Mississippian to Middle(?) Pennsylvanian black shale,chert,limestone and dolomite found in Alaska(n). It overlies the Kayak Formation and is overlain by the Siksikpuk formation. It is laterally equivalent to the Wachsmuth/Alapah Limestones. It is a member of the Lisburne Group

Fossils: goniatites, mollusks, brachiopods, corals

Kurupa Sandstone

Lower Mississippian sandstone,shale,siltstone found in Alaska(n). It overlies the Hunt Fork Shale and is overlain by the Kayak Shale. It is a member of the Endicott Group

Fossils: Plants

Kwadacha Reef

fossiliferous Middle Devonian Carbonates contemporaneous with Paul River dolomitic siltstones Refer to the Akie Reef Complex [#AkieReef]

Fossils: Marine invertebrates

Kwadacha

Up 1000 meters of Middle Silurian thin bedded siltstone found in British Columbia(ne). It overlies the Ospika Formation and is overlain by limestones. It is a member of the Road River Group

Fossils: Graptolites

La Jolla Group

213m Eocene sand,silt,conglomerate CA(sw) Rosarito Poway fossils:mollusks GEOLEX link NO cgkn link La Jolla

La Loche

Up to 30 meters of Middle Devonian sandstone and breccia found in Alberta(n) and Saskatchewan. It overlies precambrian basement beds and is overlain by the Chinchaga,Keg River,Contact Rapids Formations.

Fossils:

Ladd

518m Cretacous,Upper conglomerate,sandstone CA(sw) Trabuco Williams fossils:marine invertebrates GEOLEX link NO cgkn link

Lake Bridgeport

27m Pennsylvanian,Upper claystones TX(ne) Palo Pinto Jasper Creek,Chico Ridge fossils:mollusks GEOLEX link NO cgkn link Graford

Lake Kemp

1m Permian,Lower limestone TX(n,c) Maybell,Lueders Arroyo fossils:algae GEOLEX link NO cgkn link Albany,Wichita

Lake Louise Shale

30 meters of Lower Cambrian shale within the Gog Group found in Alberta(sw) and British Columbia. Its stratiagraphic position is difficult to ascertain. At Lake Louise, it is overlain by the St Piran Formation It is a member of the Gog Group

Fossils: brachiopods, ichnofossils

Laketown Dolomite

Over 300 meters of massive, fossiliferous Silurian dolomite with minor chert, sandstone, limestone found in Idaho,Utah,and Wyoming(sw). It overlies the Fish Haven dolomite and is overlain by the Jefferson Dolomite/Sevy Dolomite/Water Canyon

Fossils: sometimes very abundant marine invertebrates - brachiopods, corals, crinoids

Lake Valley

64m Mississippian,Early Limestone NM(w),TX(w)? Percha/Caballero Magdalena fossils; marine invertebrates (abundant) GEOLEX link No cgkn link Groupis

Lamb Dolomite

320 meters of Upper Cambrian dolomites with minor sandstone found in Utah(nw) and Nevada. Overlies the Trippe Limestone and is overlain by the Hicks formation/Straight Canyon

Fossils: Algal structures, a few invertebrate fragments

LaMotte Sandstone

122m Cambrian,Middle-Cambrian,Upper Sandstone MO,IL Iron Mountain |St Joseph/Fredrickstown/Bonneterre/Arbuckle fossils:None? GEOLEX link NO cgkn link

La Martre Falls Formation

An obsolete term for beds belonging to the Mount Cap,Saline River, and Franklin Mountain Formations Fossils:
122m Cambrian-Middle Ordovician shale,sandstone,sandy dolomite Northwest Territories(c) Old Fort Island Chedabucto Lake Mount Cap,Saline River,Franklin Mountain fossils-a few marine invertebrates in some places NO GEOLEX Entry cgkn http://weblex.nrcan.gc.ca/html/007000/GSCC00053007864.html

Lander Sandstone

About a meter of fossiliferous Middle Ordovician sandstone found in Wyoming and Montana at the base of the Bighorn Dolomite. It overlies the Gallatin Limestone

Fossils: Abundant cephalopods,gastropods,corals,brachiopods. Also worms and trilobites

Landry Limestone

Up to 488 meters of thick bedded Devonian limestones found in the Northwest Territories(w). It overlies the Arnica Formation/Manetoe Formation/Natla FormationFuneral Formation and is overlain by the Headless/Chinchaga Formation It is laterally equivalent to parts of the [Manetoe Formation #Manetoe]/Bear Rock Formation/Gossage Formation.

Fossils: marine invertebrates - brachiopods

Langston Dolostone

Up to 35 meters of massive Lower Cambrian dolomite and shale found in Idaho(se) and Utah(ne). Includes the Naomi Peak Limestone and the Spence Shale. It overlies the Geertsen Canyon Quartzite and is overlain by the Ute Limestone

Fossils: abundant marine invertebrates in the Spence Shale

Lardeau Group

Cambrian through Devonian beds found in British Columbia(se). It includes the Index, Triune, Ajax, Sharon Creek, Jowett, and Broadview Formations

Fossils: Unknown

Latham Shale

25 meters of fossiliferous green Lower Cambrian Shale found in the Northeastern Mojave Desert of California. It overlies the Zabriskie Quartzite and is overlain by the Chambless Limestone. It is laterally equivalent in part to portions of the Carrara, Prospect Mountain Quartzite, and Tapeats Sandstone formations to the North and East.

Fossils: Olenellid trilobites,inarticulate brachiopods,hyolithids,Anomalocaris appendages,poorly preserved soft bodied forms.

La Tuna Formation

about 120 meters of Lower Pennsylvanian limestone and chert. It overlies the Berino Formation/Helms Formation It is a member of the Magdalena Group

Fossils: bryozoans, brachiopods, and crinoids.

Las Cruces Limestone

18m Mississippian,Upper limestone NM(sc),TX(w) Percha Rancheria fossils: marine invertebrates(sparse) GEOLEX link NO cgkn link

Las Posas

23m Pleistocene sand/gravel/conglomerate CA(sw) Pico ? San Pedro fossils:present GEOLEX link NO cgkn link

Lawlor

30m Pliocene tuff CA(wc) Neroly Wolfskill fossils: GEOLEX link NO cgkn link

Lead Bell Shale

150 meters of Middle Cambrian claystone and sandstone found in Idaho and Utah. It overlies the Twin Knobs Formation/Naomi Peak Limestone and is overlain by the Bancroft Limestone. It Includes the Cub Shale and the Spence Shale.

Fossils: Trilobites in some beds

Lead Gulch Formation

Up to 100 meters of cyclically bedded Upper Cambrian limestone, dolomite, siltstone, and chert found in the Inyo Mountains of California. It overlies the Bonanza King Formation and is overlain by the Tamarack Canyon Dolomite

Fossils: A few marine invertebrates

Leadville Limestone

About 150 meters of Mississippian limestone, chert, and dolostone found in Arizona(ne),Colorado,New Mexico(nw), and Utah(se). It overlies the Chaffee Formation/Dyer Formation/Ouray Limestone and is overlain by the Kerber Formation/Belden Shale/Molas Formation

Fossils: Forams in some beds. A few marine invertebrates-corals brachiopods,conodonts as well

Leatham

roughly 25 meters of fossiliferous Upper Devonian and Lower Mississippian shale with minor limestone and sandstone found in Idaho(se), Utah(n) and Wyoming(sw). It overlies the Beirdneau Formation/Jefferson Formation and is overlain by the Lodgepole Limestone/Madison Formation. It is a member of the Pilot Shale.

Fossils: conodonts, brachiopods in the limestones

Leduc Formation

Isolated Devonian shallow water reef limestones, mudstones, dolomites, etc up to 300 meters thick found in Alberta subsurface. It overlies the Cooking Lake Formation/Woodbend Formation/Precambrian beds and is overlain by the Duvernay/Ireton/Woodbend formations.

Fossils: Presumably marine invertebrates

Lehman Limestone

60 meters or more of Middle Ordovician limestone and quartzite. It is found in Western Utah and Eastern Nevada. It overlies the Kanosh Shale and is overlain be the Swan Peak Quartzite. The Lehman is the uppermost formation in the Pogonip Group

Fossils: Reasonably abundant Middle Ordovician marine fossils-trilobites, brachiopods, snails, sponge spicules, algae, ostracods

Leigh Dolomite

Up to 27 meters of flaggy Upper Ordovician dolomite found in Western Wyoming. It overlies the Lander Sandstone and is overlain by the Darby Formation It is a member of the Bighorn Dolomite

Fossils: Ostracods, bivalves, gastropods,corals, crinoids. Preservation may be poor.

Liard

418m Triassic,Middle-Triassic,Upper siltstone,sandstone,dolomite BC Toad Garbutt/Buckinghorse ./MIDCONT.HTM#Buckinghorse/[Charlie Lake Halfway/Sulphur Mountain fossils:? NO GEOLEX link cgkn link

Lime Ridge

53m Pennsylvanian,Middle limestone,shale AZ,CA,NM,UT Molas Pinkerton Trail fossils-fusilinids,others? GEOLEX link NO cgkn link Hermosa

Lion Mountain

15m Cambrian,Upper sandstone,limerstone TX(c) Wilberns Cap Mountain fossils:marine invertebrates GEOLEX link http://ngmdb.usgs.gov/Geolex/NewUnits/unit_8719.html NO cgkn link Riley

Lisburne Group

900? meters of Lower Mississippian to Lower Permian limestone and shale found in Alaska(n) and the Yukon Territory. It includes the Akmalik Chert, Alapah Limestone, Kuna Formation, Wachsmuth Limestone, Wahoo Limestone, Nasorak Formation, Kogruk Formation, and Tupik Formation. It overlies the Kayak Shale and is overlain by the Siksikpuk/Sadlerochit Formations.

Fossils: forams, others?

Little Bighorn Dolomite

Up to 48 meters of dolomite and dolomitic limestone found in Wyoming(nc). It overlies the Cottonwood Canyon Formation/Jefferson Dolomite/Bighorn Dolomite/Gallatin Limestone and is overlain by the Woodhurst Formation. It is a member of the Madison Limestone

Fossils: conodonts, brachiopods, corals

Little Buffalo

41 meters of Devonian dolomite,limestone and minor shale found in the Northwest Territories. It overlies the Chinchaga Formation and is overlain by the Nyarling Formation. It is laterally equivalent to the Pine Point/Nahanni Formations.

Fossils: corals,brachiopods,echinoderm fragments

Little Dal

2200 meters of Proterozoic limestones,shales and gypsum found in the Northwest Territories It overlies the Katherine Group and is overlain by the Redstone River Formation

Fossils: Stromatolites

Little Flat

About 295 meters of cliff-forming Mississippian limestone, siltstone and sandstone found in Idaho(SE) and Utah(NE). It overlies the Lodgepole limestone and is overlain by the Monroe Canyon Limestone

Fossils: marine invertebrates-brachiopods

Little Tongue Limestone

Up to 87 meters of Lower Mississippian crinoidal limestone found in Wyoming(nc). It overlies the Big Goose Member and is overlain by the Bull Ridge Member/Darwin Sandstone It is a member of the Madison Limestone

Fossils: Crinoid debris, brachiopods, corals, forams, gastropods

Littlehorn Limestone

An obsolete term for Mississippian limestones found in Wyoming. The Littlehorn rocks are now assigned to the Madison Limestone

Fossils: Marine fossils

Livermore

? Pliocene-Pleistocene gravel CA(wc) Orinda/Cierbo recent fossils:? GEOLEX link NO cgkn link

Livingstone Formation

500 meters of Mississippian crinoidal limestones found in Montana and Alberta. It overlies the Banff Formation and is overlain by the Mount Head Formation. Is divided into Pekisko and Turner Valley members It is a member of the Rundle Group

Fossils: crinoid fragments, brachiopods

Livock River

5.5m Devonian,Middle limestone,dolomite AB(ne) Elk Point Waterways Beaverhill Lake/Slave Point fossils:marine invertebrates-brachiopods,crinoids NO GEOLEX link cgkn link

Llajas

524m Eocene conglomerate/sand/siltstone CA(sw) Coal Canyon Sespe fossils:forams GEOLEX link NO cgkn link

Lodgepole Limestone

As much as 240 meters of thin bedded Lower Mississippian limestone and shale found in Idaho(se),Montana,North Dakota(w),South Dakota(w),Utah(n),Wyoming(w),Saskatchewan(s), and Manitoba(sw). It overlies the [Jefferson Limestone/Three Forks Formation/Sappington Sandstone and is overlain by the Mission Canyon Limestone. It is a member of the Madison Group

Fossils: Sometimes abundant marine invertebrates -brachiopods,conodonts,corals,etc

Lodore Shale

Up to 400 meters of Upper Cambrian shale and thin sandstones found in Utah(ne), Wyoming, and Colorado(nw). It overlies the Unita Group and is overlain by the Redwall Limestone/Ogden Quartzite

Fossils: Enough trilobites and brachiopods to date the formation

Log Springs

Up to 25 meters of Upper Mississippian shale, sandstone and conglomerate found in New Mexico. It overlies the Arroyo Penasco Formation and is overlain by the Madera Group/Osha Canyon Formation

Fossils: None?

Lohn Shale

23m Pennsylvanian,Upper clay,shale,sandstone,limestone,coal TX(c) Speck Mtn Parks Mountain fossils:present GEOLEX link http://ngmdb.usgs.gov/Geolex/Units/Lohn_9073.html| cgkn link Thrifty

Lombard Limestone

130 meters of Upper Mississippian limestone,siltstone, and shale found in Montana(sw). Overlies the Kibbey Formation and is overlain by the Conover Ranch Formation A member of the Snowcrest Range Group

Fossils: Corals, brachiopods

Lomita

91m Pliocene-Pleistocene marl,sand CA(sw) Repetto Timms Point Las Posas fossils:marine invertebrates GEOLEX link NO cgkn link

Lone Butte

128 meters of oily Upper Devonian limestones and dolostones found in Wyoming. It overlies the Coopers Lake Limestone and underlies the Spotted Bear Limestone It is a member of the Jefferson Limestone.

Fossils: unknown-marine invertebrates?

Lone Mountain Dolomite

Up to 1500 meters of Upper Silurian-Lower Devonian dolomite found in Nevada and Utah. Laterally equivalent to the Roberts Mountains Formation and Laketown Dolomite

Fossils: marine invertebrates

Lone Mountain (Canada)

490 meters of Silurian dolomite and limestone found in the Northwest Territories. It is overlain be Devonian beds

Fossils: corals

Lonely Bay

Devonian dolomite and limestone found in the Northwest Territories. It overlies the Chinchaga/Willow Lake Formations and is overlain by the Horn River Formation. It is laterally equivalent to the Pine Point/Keg River/Hume/Nahanni Formations.

Fossils: Brachiopods,cephalopods

Loray

754m Permian,Lower siltstone,limestone,gypsum,anhydrite NV(ec),UT(wc) Pequop Kaibab/Plympton fossils:present GEOLEX link NO cgkn link Arcturus

Lost Burro Formation

600 meters or so of Middle and Upper Devonian limestone, dolomite, sandstone, quartzite, shale found in California(ec) It overlies the Hidden Valley Dolomite and is overlain by the Tin Mountain Limestone

Fossils: Stromatoporoids, brachiopods, crinoid debris, bryozoa, a few gastropods.

Lost Sheep Dolomite

About 80 or 90 meters of Middle Silurian dolomite and chert found in Utah(nw). It overlies the Harrisite dolomite and is overlain by the Thursday Dolomite. It is a member of the Laketown Dolomite

Fossils: A few Crinoid fragments, Horn corals, brachiopod, and gastropods

Lotsberg

229 meters of Middle Devonian salt and shale found in Alberta and Saskatchewan. It overlies Lower Devonian beds and is overlain by the Ernestina Lake Formation. It is laterally equivalent to the Meadow Lake Formation/La Loche Formation/Stone Formation/Arnica Formation/Mirage Point Formation.

Fossils: None?

Lueders

6m Permian,Lower limestone TX Paint Rock Abilene fossils:abundant mollusks GEOLEX NO cgkn link Wichita/Albany

Lusardi

122m Cretaceous,Upper conglomerate,sandstone CA(sw) igneous/metamorphic rocks La Jolla/Pt Loma fossils: GEOLEX link NO cgkn link Rosario

Lyell

519m Upper Cambrian limestone AB,BC Sullivan Bison Creek fossils:A few trilobites NO GEOLEX link cgkn link http://weblex.nrcan.gc.ca/html/008000/GSCC00053008870.html

Lykins

250 meters of Permian/Triassic redbed sandstone with minor limestone found in Colorado(e). It overlies the Lyons Sandstone is overlain by the Morrison Formation/Ralston Formation

Fossils: algae-stromatolites

Lyleton Formation

Up to 50 meters of Upper Devonian shale, siltstone, anhydrite, and dolomite found in North Dakota, Saskatchewan, and Manitoba. There may be no surface exposures. It overlies the Birdbear Formation/Nisku Formation and is overlain by the Bakken Formation/Jurrasic Amaranth Formation. It is a member of the Qu'Appelle Formation/Three Forks Group

Fossils: None?

Lynch Dolomite

250 meters of Middle and Upper Cambrian dolomite and limestone found in Utah(nw) and Arizona(nc) It overlies the Bowman Limestone and is overlain by the Jefferson Formation.

Fossils: A few hyolithids reported

Lyndon Limestone

110 meters of Middle Cambrian limestone found in Arizona,California,Nevada,and Utah. It overlies the Pioche Shale and is overlain by the Chisholm Shale It is divided into Meriwitica and Tincanebits members.

Fossils: None?

Lynx

? thick Cambrian,Upper rock_types AB,BC Arctomys Survey Peak members:Lyell,Bison Creek,Mistaya,Waterfowl,Sullivan fossils NO GEOLEX link cgkn link http://weblex.nrcan.gc.ca/html/008000/GSCC00053008882.html Lynx

Lyons Sandstone

About 100 meters of Lower Permian shoreline and eolian sandstone found along the Front Range in Wyoming and Colorado(e). It overlies the Fountain Formation/Owl Canyon Formation and is overlain by the Lykins Formation. The nomenclature of Permian beds in the Lyons interval South of Denver seems to be uncertain.

Fossils: Reptile tracks

Madera Limestone

About 410 meters of Middle Pennsylvanian to Lower Permian limestone with minor shale and sandstone found in New Mexico and Colorado. It overlies the Sandia Formation/Osha Canyon Formation/preCambrian beds and is overlain by the Bursum Formation/Pass Creek Sandstone/Sangre de Christo formation/Abo Formation. It is the uppermost member of the Magdalena Group.

Fossils: fusulinids, brachiopods, bryozoans

Madison Limestone

As much as 640 meters of Upper Devonian and/or Mississippian limestone/shales found in Colorado, Idaho, Montana, Nebraska, North Dakota, Saskatchewan, South Dakota, Utah and Wyoming. It overlies the Three Forks Shale/Jefferson Limestone/Guilmette Formation/Engelmann Formation/Bakken Formation/Darby Formation/Lodore Formation and is overlain by the Quadrant Formation/Ellis Group/Woodman Formation/Deseret Limestone/Williams Canyon Limestone/Sacajawea limestone/Charles Limestone/Amsden Formation/Kibbey Formation/Horseshoe Shale/Darwin Sandstone/Humbug Formation/Big Snowy Group It is subdivided into the Allan Mountain Formation, Castle Reef Dolostone, Charles Formation, Lodgepole Limestone, Mission Canyon Formation, Ratcliffe Formation, Big Goose Member, Bull Ridge Member, Cottonwood Canyon Member, Dean Lake Chert, Little Bighorn Member, Little Tongue Member, Monitor Mountain Member, Muddy Mountain Chert, Paine Member, Rooney Chert, Saypo Member, Silvertip Conglomerate, Woodhurst Member, Englewood limestone, Pahasapa limestone/Sawtooth Formation

Fossils: brachiopods, bryozoa, corals, conodonts

Magdalena Formation

Up to 400 meters of Middle Pennsylvanian to Lower Permian limestone,shale,and sandstone found in New Mexico and Texas. It overlies the Percha Shale/Cutter Dolomite. It is overlain by the Manzano Group/Hueco Formation/Abo Formation. In some areas it is subdivided into the Arroyo Penasco Group, Sandia formation, Madera limestone, and Bursum formation In others into the Red House, Nakaye, Bar B, and Bursumformations

Fossils: Marine invertebrates

Mahto Formation

Up to 459 meters of Lower Cambrian sandstone found in Alberta (wc) and British Columbia (ec). It overlies the Mural Limestone and is overlain by the Hota/Snake Indian formations. It is probably laterally equivalent to the Dome Creek Formation.

Fossils: ichnofossils

Maligne

Up to 30 meters of Upper Devonian calcaerous mudstones found in Alberta(wc) and British Columbia(ec). It overlies the Flume Formation and is overlain by the Perdrix Formation. It is laterally equivalent to the Cairn Formation.

Fossils: bracbiopods, crinoids, other marine invertebrates in some exposures

Manetoe

115 meters of Middle Devonian dolomite and limestone found in British Columbia, the Northwest Territories, the Yukon Territory. It overlies the Arnica Formation and is overlain by the Headless/Landry/Hume Formations. It is laterally equivalent to the Landry/Nahanni Formations.

Fossils: Poorly preserved Amphipora, brachiopods, crinoids

Manitoba

244m Devonian,Middle-Devonian,Upper salt,dolomite,limestone MB(se),MT(e),ND,SD(n),SK Prairie Evaporite/Winnipegosis Saskatchewan fossils:marine invertebrates? GEOLEX link cgkn link Manitoba

Manitou limestone

66 meters of Lower Ordovician limestone/dolomite with a little shale found in Colorado(c). It overlies the Peerless Shale/Sawatch Formation/Deadmans Gulch/preCambrian rocks. and is overlain by the Williams Canyon Formation/Glen Eyrie Formation. It is a member of the Horseshoe Mountain Group.

Fossils: trilobites, brachiopods, gastropods, cephalopods, conodonts, sponge spicules, pelmatozoans, graptolites

Manakacha

91m+ Pennsylvanian,Middle sandstone,limestone,mudstone AZ(nw) Watahomigi Wescogame Sandstone Callville Limestone fossils:None? GEOLEX link NO cgkn link Supai

Manning Canyon Shale

As much as 400 meters of shale, quartzite and a little limestone Upper Mississippian to Middle Pennsylvanian shale found in Idaho(s) and Utah(n). It overlies the Great Blue Limestone and is overlain by the Oquirrh Quartzite

Fossils: Marine invertebrates

Manzano Group

An obsolete grouping of Permian formations in New Mexico that includes the Bursum Formation, Abo Formation, Yeso Formation, Glorieta Sandstone, and San Andreas Limestone.

Fossils: A few marine invertebrates in the lower beds and plants in the upper beds

Maple Limestone

700 meters of Lower and Middle Permian limestone and sandstone found in Utah(c). It overlies the Manning Canyon Shale and is overlain by the White Pine Formation. It is the basal member of the Oquirrh Group

Fossils: brachiopods, fusulinids, corals

Marble Falls

152m Pennsylvanian,Lower-Pennsylvanian,Middle limestone,shale TX(c) Ellenburger/Barnett Smithwick fossils:marine invertebrates GEOLEX link NO cgkn link Bend

Marion

123m Permian shale,limestone,marl,gypsum,conglomerate KS,NE,OK Chase Dakota Wellington fossils:brachiopods GEOLEX link NO cgkn link Sumner/Chase

Marjum Limestone

466m Cambrian,Middle Limestone,shale UT(wc) Wheeler Shale Weeks Pierson Cove/Trippe Limestone fossils:Trilobites(abundant) GEOLEX link http://ngmdb.usgs.gov/Geolex/NewRefsmry/sumry_9186.html NO cgkn link

Marmaton

76m Pennsylvanian,Middle shale,sandstone,limestone,(coal) IA,KS,MO,NE,OK,TX Cherokee Branson/Hepler Sandstone fossils: Brachiopods; bryozoans, crinoid remains, mollusks, corals; conodonts;plants-coal GEOLEX link NO cgkn link Des Moines

Maroon

Up to 1300 meters of Pennsylvanian and Permian conglomerate and sandstone found in Colorado(c). It overlies the Weber Formation/Kerber Formation. It has been divided into Coffman conglomerate, Chubb siltstone member and Pony Spring siltstone members.

Fossils: Mostly absent, but some marine invertebrates -- brachiopods,crinoids,corals -- have been reported.

Martin Limestone

100 meters of fossiliferous Middle and Upper Devonian marine limestones widely distributed in Arizona. Overlies the Abrigo Limestone/Troy Sandstone/Bolsa Sandstone and is overlain by the Escabrosa Limestone/Ouray Limestone/Redwall Limestone

Fossils: Abundant and diverse in some beds. Brachiopods, fish fragments

Martinez

610m Paleocene-Eocene(?) sandstone/shale/sand CA(wc) Chico Tejon Coal Canyon fossils:marine invertebrates(60+ taxa) GEOLEX link NO cgkn link

Maxfield Limestone

185 meters of dolomitic Middle Cambrian limestone found in Utah. It overlies the Ophir Shale and is overlain by the Jefferson Dolomite

Fossils: trilobites and brachiopods

Masket Shale

150 meters of Silurian and Lower Devonian shale with minor limestonefound in Nevada(c). It overlies the Diana/Gatecliff and is overlain by the McMonnigal Formation

Fossils: A few graptolites Enough ostracods for dating. Marine invertebrates in the limestones.

Mattson

Up to 1400 meters of cyclic Mississippian sandstone and shale with some limestone and coal found in British Columbia(ne) and the Northwest(w) and Yukon(e) Territories. It overlies the Flett, Golata and Besa River formations, and is overlain by the Kindle Formation,Belloy Formation, and Fort St John Group. It is laterally equivalent to parts of the Stoddart Group,Mount Head Formation, and Etherington Formation.

Fossils: Mostly plants, but locally marine invertebrates - brachiopods, bryozoa, pelmatozoa are present

Maurice

An obsolete term for 60 meters of Upper Cambrian conglomerate, shale and limestone The name has been replaced by the Pilgrim Formation? It overlies the Park Shale and is overlain by the Snowy Range Formation.

Fossils: a few trilobites

Maybell

? Permian,Lower limestone TX Lueders | fossils: GEOLEX link NO cgkn link Lueders

Maywood

Up to 100 meters of Devonian shale, limestone, and sandstone found in Montana(w) and Wyoming(n) where it overlies the Red Lion Formation and is overlain by the Jefferson Limestone

Fossils: Generally unfossiliferous. A few brachiopods have been recovered

Mazourka Formation

200 meters or more Fossiliferous Lower and Middle Ordovician limestones, shales, and siltstones found in the upper reaches of Mazourka Canyon in the Inyo Mountains of California. It overlies the Tamarack Canyon Dolomite and is overlain by the Barrel Spring Formation It is subdivided into the older Al Rose Formation and the younger Badger Flat Limestone.

Fossils: Graptolites, Trilobites,brachiopods

McCann Hill Chert

244m Devonian chert,shale,limestone AK(ec),YU Road River Nation River abundant marine invertebrates-bryozoans,trilobites,brachiopods,pelecypods,conodonts,tentaculitids GEOLEX http://ngmdb.usgs.gov/Geolex/NewRefsmry/sumry_6008.html NO cgkn link Groupis

McCloud

? Permian,Lower limestone CA(nw) Baird fossils:? GEOLEX link NO cgkn link Not to be confused with the Cretaceous McCloud member of the Centuar formation in SK

McKenzie Canyon Limestone

140m Mississippian,Upper limestone MT(sw) Mission Canyon Kibbey fossils:corals,conodonts GEOLEX link NO cgkn link Tendoy Group

McLure

260m Miocene shale CA(sc) Devilwater/Santa Margarita Reef Ridge/Etchegoin Monterey fossils:forams GEOLEX link NO cgkn link Monterey

McColley Canyon Formation

200 meters of Lower Devonian limestone and dolomite found in Nevada(ne). It overlies the Rabbit Hill Limestone/Beacon Peak Dolomite and is overlain by the Union Mountain Limestone/Denay Limestone/Sadler Ranch Formation It is the lowest member of the Nevada Limestone

Fossils: marine invertebrates-brachiopods

McElmo

300+m Jurassic,Upper Sandstone,shale CO(sw),NM(nw),UT(se) La Plata Dakota Morrison Formation fossils:None? GEOLEX link NO cgkn link Obsolete name

McKay

1200 meters of Upper Cambrian and Lower Ordovician slate and minor limestone found in British Columbia. Not to be confused with the Miocene McKay formation found in Oregon. It overlies the Ottertail Formation and is overlain by the Mt Wilson Formation/Glenogle Formation

Fossils: None?

McKay Formation (Miocene)

Up to 72 meters of Miocene-Pliocene calcaerous conglomerate found in Oregon(ne). It overlies basalts and is overlain by loess deposits. It is a member of the Dalles Group.

Fossils: (non-marine?) vertebrates

McKracken

A name assigned to a probably Devonian sandstone below the Elbert Formation found in the four corners region where Arizona, New Mexico, Colorado and Utah meet.

Fossils: Very few. Fragments of Devonian fish bones reported from one site.

McMonnigal

65 meters of medium bedded Upper Silurian and Lower Devonian cherty limestone found in Nevada. It overlies the Tor Limestone and is overlain by the Kinkead Spring Limestone.

Fossils: Corals, brachiopods and graptolites in some beds

McNamara Formation

about 1000 meters of Proterozoic argillite,quartize and sandstone found in Montana. It overlies the Hellgate Formation and underlies the Garnet Range Formation. It is a member of the Belt Supergroup

Fossils: None

McNaughton Formation

600 meters of Lower Cambrian sandstone and quartzite found in Alberta(w) and British Columbia(e). It overlies the Miette Group and is overlain by the Mural Formation

Fossils: Ichnofossils

Meadow Lake

55 meters of Upper Devonian limestones and siltstones found in Saskatchewan (sw?)(subsurface only). Overlies the Deadwood Formation and is overlain by the Winnipegosis Formation. Not to be confused with the Meadow Lake Volcanics found in California

Fossils: Unknown

Meagher Limestone

More than 127 meters of thin bedded Middle Cambrian limestone/dolomite and shale found in Idaho,Wyoming,and Montana. It overlies the Barker Formation/Wolsey Shale/Flathead Sandstone and is overlain by the Park Shale/Mission Canyon Formation

Fossils: trilobites and other marine invertebrates in some beds.

Meek Limestone

About 40 meters of Pennsylvanian limestone with minor shale/chert found in Nebraska, South Dakota(sw), and Wyoming(ne). It overlies the Hayden Group/Reclamation Group/Roundtop Group and is overlain by the Wendover Group/Broom Creek Formation. It is the lower member of the Hartville Formation.

Fossils: Crinoids, brachiopods.

Meganos

Paleocene ? CA(wc) Martinez Tejon fossils:marine mollusks GEOLEX link NO cgkn link

Melita

677m Jurassic,Lower shale,sandstone MB Reston/paleozoic beds Waskada,Swan River,Ashville fossils:marine invertebrates NO GEOLEX link cgkn link

Mendha

About 700 meters of Upper Cambrian/Lower Ordovician limestone/dolomite/and minor shale found in Nevada. It overlies the Highland Peak Limestone and is overlain by the Yellow Hill Limestone

Fossils: Algal balls, trilobite fragments, gastropods, brachiopods

Mendenhall Formation

140 meters of non-marine? Silurian limestone and dolomite found in the subsurface of North Dakota(nw) and Montana. It overlies the Grondale Formation/Cedar Lake Formation and is overlain by the Missouri Breaks Formation. It is a member of the Interlake Group.

Fossils: Unknown. None reported

Meriwitica

Up to 6 meters of Middle Cambrian dolomite found in Arizona(nw). It overlies the Tincanebits Sandstone and is overlain by the Flour Sack Formation. It is a member of the Bright Angel Shale

Fossils: marine invertebrates

Mesa Redondo

49m Triassic,Upper Mudstone,Siltstone,Sandstone AZ(ne) Moenkopi/Shinarump Petrified Forest/Monitor Butte fossils:None GEOLEX link NO cgkn link Chinle

Michelle

195m Devonian, Lower shale,limestone,dolomite YU Road River Ogilvie fossils; Sometimes abundant marine invertebrates-sponges, stromatoporoids, corals, bryozoans, brachiopods, cricoconarids, pelecypods, goniatites, trilobites and conodonts NO GEOLEX link cgkn link

Midale

23m Mississippian,Upper evaporites,carbonates ND(nw),SK Frobisher-Alida Ratcliffe Strathallen/Shunda fossils: None GEOLEX link cgkn link Madison subsurface only?

Midas

About 150 meters of Lower Cambrian Shale and siltstone found in British Columbia(n?). It is overlain by the Mural Formation

Fossils: Ichnofossils

Middle Canyon

213m Mississippian siltstone,limestone ID(sc),MT(sw) Milligen Scott Peak Madison fossils:Marine inverebrates-corals,bryozoa(fragments),crinoids(fragments) GEOLEX link NO cgkn link White Knob

Miette Group

5800 meters of late Proterozoic phylite,quartzite and limestone found in Alberta(wc) and British Columbia(c). It is overlain by the McNaugton Formation

Fossils: a few ichnofossils in the topmost beds.

Milford Group

Mississippian to Triassic sediments found in British Columbia(se). It overlies the Hamill Group/Lardeau Group

Fossils: Some fossils present?

Milburn

31m Pennsylvanian shale,clay,sandstone,limestone,coal TX(c) Richland/Gordon Shale/Rochelle conglomerate Brownwood/Ranger fossils:plants GEOLEX link NO cgkn link Canyon

Millican

? PreCambrian limestone,sandstone,conglomerate TX(wc) Carrizo Van Horn Formation,Hueco Formation Allamoore,Hazel fossils: [GEOLEX link NO cgkn link

Milligen Formation

1000 meters or more of Lower to Middle Devonian calcaerous shale, limestone and quartzite found in Idaho(sc). It overlies the Trail Creek Formation and overlies the Wood River Formation.

Fossils: corals, stromatoporoids, crinoids, plant fragments, brachiopods

Millsap limestone

An obsolete term for 10 meters of Lower Mississippian limestone now included in the Williams Canyon Formation in Colorado. It overlies the Fremont Formation and is overlain by the Fountain Formation

Fossils: brachiopods

Minnekahta limestone

15 meters of thin bedded Lower Permian dolomitic limestown found in Colorado, Montana(se), Nebraska(nw), North Dakota(w), South Dakota(w), and Wyoming. It overlies the Opeche Shale and is overlain by the Spearfish Formation/Glendo Formation/Chugwater Formation.

Fossils: Marine invertebrates at a few localities

Minnelusa Sandstone

Up to 150 meters of red Pennsylvanian(?) sandstones found in Montana,Nebraska,North Dakota,South Dakota, and Wyoming. it overlies the Pahasapa limestone and is overlain by the Opeche Formation

Fossils:

Mint Canyon

1067m Miocene sandstone,mudstone,tuff,conglomerate CA(sw) Tick Canyon recent fossils:plants GEOLEX link NO cgkn link

Minturn

Up to 2000 meters of Carboniferous Limestone,Sandstone,Shale,Conglomerate, and grit found in Colorado. It overlies the Leadville Limestone/Belden Shale and is overlain by the Maroon Formation/Morrison Formation.

Fossils: Marine invertebrates-corals,brachiopods,etc and a few shark teeth

Mirage Point

Up to 181 meters of Middle Ordovician to Middle Devonian redbed dolomite, shale, siltstone, anhydrite, and salt found in the Northwest Territories(sw). It overlies the Old Fort Island Formation/precambrian basement and is overlain by the Chinchaga Formation

Fossils: None

Misener Sandstone

2m Devonian Sandstone,shale OK Arbuckle/Hunton/Viola Woodford Shale fossils:conodonts,brachiopods GEOLEX link NO cgkn link

Misfortune

Devonian black shales with minor beds of other types found in the Yukon Territory. It overlies the Hailstone Formation/Portrait Lake Formation and is overlain by the Thor Hills Formation. It is laterally equivalent to the Canol Formation

Fossils: a few conodonts?

Misinchinka

Proterozoic beds found in British Columbia(ne)

Fossils: None

Mission Canyon Limestone

Over 150 meters of pure, white Mississippian limestone found in Idaho(se),Montana,North Dakota(w),Saskatchewan,South Dakota(w),and Wyoming. It overlies the Lodgepole Limestone and is overlain by the Ellis Formation/Kibbey Formation/Charles Formation/Spearfish Formation/Rierdon Formation. It is a member of the Madison Group

Fossils: Some marine invertebrates-corals,brachiopods,forams

Mission Creek

thick Age rocks AK(ec) Tahkandit Limestone fossils: NO GEOLEX link cgkn link Not to be confused with the Upper Pennsylvanian Mission Creek shale member of the Deer Creek fm in IA,MO,KS,NE

Missoula

Roughly 6000 meters of Proterozoic quartzite,argillite,and sandstone found in Idaho(n),Montana(nw),and Washington(e). It is divided into a number of formations. It overlies older sediments and is overlain by the Flathead Sandstone. Its relationship to rocks of the same age termed the Belt Supergroup is hazy.

Fossils: None? Stromatolites?

Missouri Breaks Formation

9 meters of interbedded lacustrine Silurian quartzite and limestone found in Montana and North Dakota(nw). May not be exposed on surface. It overlies the Mendenhall Formation and is overlain by the Sherven Formation. It is a member of the Interlake Group.

Fossils: abundant fish fragments, ostracods

Mistaya

158m Cambrian,Upper dolomites,limestones AB,BC Bison Creek Mons Lynx fossils: stromatolites NO GEOLEX link cgkn link

Misty

675m Pennsylvanian,Lower dolomitic sandstone/limestone AB/BC Etherington Formation Kananakis/Ishbel Group Tunnel Mountain fossils:marine invertebrates NO GEOLEX link cgkn link

Modelo

1920+m Miocene,Upper sandstone,siltstone,shale,diatomite,conglomerate CA(sw) Martinez Ridge Route/Towsley fossils:marine invertebrates,wood,vertebrates(scales) GEOLEX link NO cgkn link

Moenave Sandstone

117m Triassic,Upper-Jurassic,Lower Sandstone AZ(ne),NV(ec),UT(sc) Chinle Kayenta/Wingate Chinle fossils:sparse plants and vertebrates GEOLEX link http://ngmdb.usgs.gov/Geolex/NewRefsmry/sumry_9341.html NO cgkn link Glen Canyon

Moenkopi Formation

As much as 600 meters of Lower and Middle Triassic mostly non-marine shale and sandstone with minor gypsum and limestone found in Arizona(n),California(se),Colorado(w),New Mexico,Nevada, and Utah(e). It overlies the Aubrey Group of late Paleozoic sediments/Kaibab Limestone/Goodridge Formation and is overlain by the Shinarump Conglomerate/Dolores Shale/Chinle Group. It has been subdivided into a number of members including the Ali Baba Member (CO*,UT*), Anton Chico Member (NM), Black Dragon Member (UT), Holbrook Sandstone Member (AZ*), Hoskinnini Member (AZ*,CO*,UT*) or Hoskinnini Tongue (AZ*,CO*,UT*), Moody Canyon Member (UT), Moqui Member (AZ*), Pariott Member (CO*,UT*), Rock Canyon Conglomerate Member (AZ*,NV*,UT*), Sinbad Limestone Member (UT*), Sewemup Member (CO*,UT*), Shnabkaib Member (AZ*,NV*,UT*), Tenderfoot Member (CO*,UT*), Timpoweap Member (AZ,NV,UT*), Torrey Member (UT), Virgin Limestone Member (AZ*,NV*,UT*), Winslow Member (AZ), and Wupatki Member (AZ*).

Fossils: Some plants. Marine inverebrates in some limestones (bryozoans, brachiopods, ammonoids, gastropods)

Moffat Trails Limestone

Up to 35 meters of Upper Mississippian limestone, dolomite and chert found in Wyoming(nw). It overlies the Horseshoe Shale and is overlain by the Ranchester Limestone. It is a member of the Amsden Formation.

Fossils: corals, foraminifers, bryozoans, ostracodes, gastropods, echinoderms, brachiopods

Molas Formation

Up to 60 meters of Lower and Middle Pennsylvanian redbed sandstone and shale with minor limestone and chert found in Arizona(NE), Colorado(sw), New Mexico(nw) and Utah. It overlies the Ouray limestone/Leadville Formation/Madison Limestone and is overlain by the Hermosa Formation/Belden Shale.

Fossils: Marine invertebrates in some limestone beds-brachiopods, bryozoa, echinoids, holothuroids, forams, ostracodes,bivalves

Mon Bluff

? Miocene,Upper-Pliocene ? CA(sc) Round Mountain Silt Kern River fossils:? NO GEOLEX link NO cgkn link Kern River

Monala

Up to 400 meters of Middle Cambrian interbedded shale,limestone and siltstone found in the area of the Inyo,White,and Silverpeak ranges in California and Nevada. It overlies the Mule Spring Formation and is overlain by the Bonanza King Dolomite. It is the uppermost formation in a sequence of Middle Cambrian, Lower Cambrian and late Proterozoic shelf sediments with different nomeclature than the corresponding nearer shore sediments found further East.

Fossils: Abundant diverse trilobites.

Monarch Formation

An obsolete term for Silurian or Devonian age rocks found in Montana overlying Middle Cambrian beds of the Barker Formation

Fossils:

Monitor Butte

76m Triassic,Upper Claystone/Sandstone AZ(ne),CO(sw),NM,UT(se) Moenkopi/Shinarump/Temple Mountain Petrified Forest/Moss Back fossils:ostracods,bivalves,phytosaurs,fish scales,plants-cycads,conifers,ferns,petrified wood GEOLEX link cgkn link Chinle

Monitor Mountain Limestone

About 90 meters of dirty, white Mississippian limestone found in Montana(w). It overlies the Rooney Chert. It is the uppermost member of the Madison Limestone.

Fossils: Marine invertebrates

Mons

? Cambrian,Upper? shales AB?,BC? Mistaya ? fossils: ? NO GEOLEX link NO cgkn link

Monster

957m Cretaceous,upper-Tertiary sandstone,mudstone,conglomerate YT Tahkandit Limestone fossils:plants NO GEOLEX link cgkn link

Monte Christo Limestone

300 meters or more of Mississippian limestone and dolomite found in Arizona(nw), California(se), Nevada(se) and Utah(sw). Overlies the Sultan Formation and is overlain by the Bird Spring Formation. Is sometimes subdivided into the (ascending): Dawn limestone,Anchor limestone,Bullion dolomite,Arrowhead limestone, and Yellowpine limestone (0 to 120 ft)

Fossils: corals, bryozoans, brachiopods, molluscs, echinoderms, crustaceans)

Montenegro Formation

Sparsely fossiliferous Lower Cambrian shale and quartzite found in the area of the Inyo,White,and Silverpeak ranges in California and Nevada. Overlies the Andrews Mountain Formation and is overlain by the Poleta Formation. It is the upper member of the Campito Formation It is part of a thick sequence of Middle Cambrian, Lower Cambrian and late Proterozoic outer shelf sediments with different nomeclature than the corresponding nearer shore sediments found further East. The Campito has a small fauna of very early trilobites.

Fossils: Sparse very early trilobites.

Monroe Canyon Limestone

About 300 meters of grey Upper Mississippian limestone found in Idaho(SE) and Utah(ne). It overlies the Little Flat Formation and is overlain by the Wells Formation.

Fossils: Brachiopods,Corals

Monterey

900m Miocene-Pliocene shale,diatomite CA(w) Vaqueros Etchegoin fish,seaweeds GEOLEX link NO cgkn link Monterey

Montney

245m Triassic,Middle shale,siltstone AB(nw),BC(ne) Stoddart Group fossils:? NO GEOLEX link cgkn link

Montoya Group

80 meters of Middle to Upper Ordovician limwstone and dolomite found in Arizona, New Mexico(s), and Texas(w). It overlies the El Paso Formation is overlain by the Fusselman Formation/Percha Limestone/Hueco Limestone. Treated as a group in the Eastern part of its range inluding the Aleman Formation, Cable Canyon Sandstone,Cutter Dolomite,Jornada Limestone,Rio Mimbres Sandstone,Second Value Dolomite,and Upham Dolomite

Fossils: Marine inverterates-Corals,brachiopods,bryozoa,sponges

Mooney Falls

100 meters of cliff-forming Mississippian limestone and dolomite found in Arizona(nc) and Utah(sc). It overlies the Thunder Springs Limestone/Whitmore Wash Limestoneand is overlain by the Horseshoe Mesa Limestone. It is a member of the Redwall Limestone

Fossils: Corals,Endothyrids

Moose Lake Dolomite

8 meters of Lower Silurian dolomite found in Manitoba(w). It overlies the Inwood formation and is overlain by the Atikameg dolomite

Fossils: abundant marine invertebrates, stromatolites

Morales

1525m Pliocene shale,limestone ca(sw) Santa Margarita Cayuma/Paso Robles fossils: A few non-marive vertebrates [GEOLEX link`http://ngmdb.usgs.gov/Geolex/NewRefsmry/sumry_11378.html] NO cgkn link

Moran

61m Permian,lower shale/limestone TX(nc) Pueblo Putnam fossils:marine invertebrates GEOLEX link NO cgkn link Cisco

Morehouse

610m Precambrian?-Cambrian,Lower? Quartzites UT Grampian Limestone Red Warrior Prospect Mountain Quartzite #ProspectMtn] fossils:None GEOLEX link NO cgkn link

Moreno

610m Cretaceous,Upper-Paleocene shale,sandstone CA(sw) Panoche Tejon/Kreyenhagen fossils:marine vertebrates,invertebrates,plants GEOLEX link NO cgkn link Chico

Morgan Formation

Up to 600 meters of red Lower Pennsylvanian sandstone, shale limestone found in Colorado(nw),Utah(ne),and Wyoming(sw). It overlies Hells Canyon Formation and is overlain by the Weber Formation. It is a member of the Durst Group. Not to be confused with the Morgan sand found in Arkansas

Fossils: marine invertebrates-fusulinids, brachiopods, bryozoans

Morro Formation

Up to 400 meters of Upper Devonian limestone and dolomite found in the Rocky Mountains of Alberta. It overlies the Sassenach Formation is overlain by the Costigan Formation It is laterally equivalent to the Wabamun Formation found in the plains.

Fossils: Marine invertebrates - brachiopods, crinoids

Moss Back

46m Triassic-Upper sandstone,conglomerate AZ,CO,UT(se) Monitor Butte Petrified Forest fossils:plants,phytosaurs,ichnofossils GEOLEX link cgkn link Chinle

Mount Cap

Up to 210 meters of Lower and Middle Cambrian sandstone, shale, and limestone found in the Northwest Territories. It overlies precambrian beds/Mount Clark Formation/Old Fort Island Formation and is overlain by the Saline River Formation. It is laterally equivalent to the Clemis Formation

Fossils: Trilobites,brachiopods,ichnofossils

Mount Clark

224m Precambrian-Lower Cambrian sandstones? Northwest Territories precambrian beds Mount Cap fossils:Ichnofossils NO GEOLEX Entry cgkn http://weblex.nrcan.gc.ca/html/010000/GSCC00053010204.html

Mount Forster

459 meters of Middle Devonian mudstones and sandstones with minor dolomites and volcanics found in British Columbia(se). It overlies the Beaverfoot Formation and is overlain by the Starbird Formation

Fossils: Fish, Charophytes (Plant-like Green algae)

Mount Greene Beds

85m Permian-Lower? phosphate,siltstone,carbonates,chert Alberta(nw?),British Columbia(ne) Stoddart Group Ranger Canyon Belcourt,Kindle,Johnston Canyon,Telford Brachiopods,Conodonts NO GEOLEX ENTRY cgkn http://weblex.nrcan.gc.ca/html/010000/GSCC00053010221.html

Mount Hawk Formation

200m Devonian-Upper shale,limestone Alberta(sw) Perdrix (numerous)brachiopods,corals NO GEOLEX ENTRY cgkn http://weblex.nrcan.gc.ca/html/010000/GSCC00053010225.html

Mount Head

Up to 350 meters of Upper Mississippian silty dolomite with shale, sandstone, chert, etc found in Alberta, British Columbia, and Montana. It overlies the Turner Valley Formation/Livingstone Formation and is overlain by the Etherington Formation. It is a member of the Rundle Group.

Fossils: Sparse marine invertebrates

Mount Kindle Formation

262m Silurian-Lower dolomites Northwest Territories(w) Ordovician or older rocks Delorme,Bear Rock,Gossage,Cretaceous strata Whittaker (sometimes abundant)corals,brachiopods,gastropods,conodonts,trilobites,echinoderms NO GEOLEX ENTRY cgkn http://weblex.nrcan.gc.ca/html/010000/GSCC00053010236.html

Mount Soledad

70m Eocene-lower-Eocene-middle cobbles,sandstone CA(sw) Cabrillo Ardath fossils:uncommon GEOLEX link NO cgkn link La Jolla

Mount Whyte Formation

44m Cambrian-Lower,Cambrian-Middle limestone,shale Alberta(sw),British Columbia(se) St Piran Cathedral trilobites,others NO GEOLEX ENTRY cgkn http://weblex.nrcan.gc.ca/html/010000/GSCC00053010312.html

Mount Wilson Sandstone

450m Middle and Upper Ordovician light grey sandstone Alberta(sw),British Columbia(se) Owen Creek,Glenogle Beaverfoot fossils:None NO GEOLEX Entry cgkn http://weblex.nrcan.gc.ca/html/010000/GSCC00053010313.html

Mouse Creek

? Pennsylvanian,Middle Shale,Limestone IA(sc) Cherokee Shale ? fossils:marine invertebrates GEOLEX link cgkn link Marmaton

Mowitch sandstone

Fossils:
76m Middle Permian sandstones,phosphates,gypsum,chert Alberta(sw),British Columbia(se) Ranger Canyon Formation Greenock brachiopods,fish fragments NO GEOLEX link cgkn http://weblex.nrcan.gc.ca/html/010000/GSCC00053010334.html

Mowitza Shale

15m Devonian shale,limestone UT(wc) Red Warrior Topache fossils:brachiopods,crinoids GEOLEX link NO cgkn link

Mule Spring Formation

Up to 150 meters of Late Lower Cambrian siltstone with minor Limestone recognized in the area of the Inyo,White,and Silverpeak ranges in California and Nevada. It overlies the Saline Valley Formation and is overlain by the Monola Formation/Emigrant Formation. It is part of a thick sequence of Middle Cambrian, Lower Cambrian and late Proterozoic shelf sediments with different nomeclature than the corresponding nearer shore sediments found further East.

Fossils: Ollenelid trilobites, other trilobites?

Muav Limestone

Up to 150 meters of Middle Cambrian limestone, dolostone, and minor shale interbedded with sandstones found in the Grand Canyon and adjacent parts of California, Arizona, Nevada, and Utah. It overlies the Bright Angel Shale and is overlain by unnamed Cambrian dolomites/Elbert Formation/Temple Butte Formation/Redwall Limestone It is a member of the Tonto group.

Fossils: very uncommon? Trilobites.

Muddy Mountain Chert

Up to 30 meters of mostly red-brown Lower Mississippian chert found in Wyoming. It is a member of the Madison Limestone It overlies and is overlain by Madison Formation limestones

Fossils: None?

Muddy Peak Limestone

240m Devonian,Middle limestone,dolomite AZ(nw)/NV(se) ? Rogers Spring/Monte Christo fossils:marine invertebrates GEOLEX link NO cgkn link

Muncho-McConnell

350m Silurian-Devonian dolomite/quartzite BC,YU Nonda Wokkpash/Stone fossils:a few fish(well preserved) NO GEOLEX link cgkn link

Mural Formation

Fossils:
730m Lower Cambrian limestone,dolomite,sandstone,shale British Columbia(E). Not to be confused with the Cretaceous Mural Limestone found in Arizona McNaughton Formation [Mahto Formation #Mahto fossils:trilobites,archaeocyathids,brachiopods,salterellids,echinoderms
NO GEOLEX link cgkn http://weblex.nrcan.gc.ca/html/010000/GSCC00053010386.html

Muskeg Formation

Fossils:
270m Middle Devonian limestone,dolomite,evaporites,salt Alberta,Northwest Territories(subsurface only?) Keg River Watt Mountain Prairie Evaporite/Pine Point/Presquile/Sulphur Point fossils:None? NO GEOLEX link cgkn http://weblex.nrcan.gc.ca/html/010000/GSCC00053010435.html

Muskwa Formation

Fossils:
37m Upper Devonian pyritic Black Shale Alberta(n), British Columbia(ne),Northwest Territories(s) Otter Park/Slave Point/Waterways Fort Simpson Horn River fossils:None? NO GEOLEX link cgkn http://weblex.nrcan.gc.ca/html/010000/GSCC00053010444.html

Mutual Quartzite

Up to 1300 meters or red-purple Precambrian quartzite and shale found in Idaho(se) and Utah(n). It overlies the Big Cottonwood Formation/Inkom Formation and is overlain by the Tintic Quartzite/Red Pine Shale/Camelback Mountain Quartzite. It is a member of the Brigham Quartzite

Fossils: None?

Naco Limestone

Up to 1000 meters of Pennsylvanian (and Permian?) limestone found in Arizona and New Mexico(sw). It is treated as a Group including the Horquilla Limestone, Earp Formation, Colina Limestone, Epitaph Dolomite, Scherrer Formation, Concha Limestone/Chiricahua limestone. It overlies the Escabrosa limestone/Paradise Formation/Redwall Limestone/Black Prince Limestone and is overlain by Supai Formation/Cretaceous Bisbee beds.

Fossils: Abundant fossils-brachiopods,mollusks,fusulinids,corals,crinoids,bryozoa,ostracods

Nahanni Limestone

137m Middle Devonian limestones British Columbia(ne),Northwest Territories(sw),Yukon Territory(s) Headless Fort Simpson Hume,Lonely Bay,Pine Point,Little Buffalo,Keg River corals,brachiopods,trilobites NO GEOLEX ENTRY cgkn link

Naiset

212m Middle Cambrian shale,siltstone,minorsandstone,limestone Alberta(sw),British Columbia(se) Gog Group Cathedral Formation Mount Whyte fossils:trilobites NO GEOLEX ENTRY cgkn link

Nakaye Limestone

130 meters of Middle Pennsylvanian limestone and chert found in New Mexico (sc). It overlies the Percha Shale/Cutter Dolomite and is overlain by the Abo Formation It is a member of the Magdalena Group

Fossils: Marine Invertebrates?

Nannie Basin Limestone

An obsolete term for a portion of the Damnation Limestone
62m Cambrian Middle limestone with clay inclusions Montana(nw) Damnation Limestone Dearborn Limestone fossils:none? GEOLEX 9483 NO cgkn link

Naomi Peak Limestone

Middle Cambrian limestone found in Idaho(se) and Utah(nc) It overlies the Pioche Shale/Brigham Quartzite and is overlain by the Spence shale/Lead Bell Shale

Fossils: Abundant marine invertebrates

Nanushuk

1753m Cretaceous sandstone,limestone,shale,quartzite,chert,coal AK(n) Torok Colville fossils:terrestrial and marine fossils GEOLEX link NO cgkn link

Naranjo Sandstone

19.5m Triassic sandstone,shale NM(ne) Chinle Ocate Glen Canyon fossils:? GEOLEX link http://ngmdb.usgs.gov/Geolex/NewRefsmry/sumry_9486.html NO cgkn link

Narchilla Formation

Fossils:
828m Proterozoic-Cambrian,Middle limestone,shale,sandstone British Columbia(n),Northwest Territories(w),Yukon Territory() Algae,Yusezyu Gull Lake,Old Cabin Formations fossils:ichnofossils-Oldhamia NO GEOLEX ENTRY cgkn link Hyland Group

Nasorak

A member of the Lisburne Group
640m Mississippian,Upper limestone,minor mudstone,shale Alaska(nw) Kogruk invertebrates(marine)(abundant)-corals, goniatites, mollusks, brachiopods;plants GEOLEX 11422 NO cgkn link Lisburne Group

Nation River

1829m Devonian Upper Conglomerate,Sandstone,Shale,Coal AK(ec),YU Calico Bluff/McCann Hill Tahkandit plants-spores GEOLEX link GEOLEX unit_11843 [http://weblex.nrcan.gc.ca/html/010000/GSCC00053010564.html]

Natla

444m Devonian Upper limestones NT Arnica Landry Grizzly Bear/Funeral crioids,tentaculids NO GEOLEX link [http://weblex.nrcan.gc.ca/html/010000/GSCC00053010566.html]

Navajo Sandstone

400m+ Triassic-Jurassic,Lower sandstone,minor thin limesto0nes AZ(n),CO(nw),MB?,NM,UT Todilto/Kayenta/Chinle McElmo/Carmel Nugget/Aztec fossils:Very rare reptile fragments GEOLEX link cgkn link LaPlata/Glen Canyon

Necessity Shale

34m Pennsylvanian,Upper sandstone,shale TX(c) Bunger Gunsight South Bend Shale fossils:? GEOLEX link NO cgkn link Cisco

Neroly

381m Miocene,Upper sandstone CA(c) Cierbo Lawlor fossils:marine invertebrates-echinoids,mollusks GEOLEX link NO cgkn link San Pablo

Neruokpuk

2438m Proterozoic-Devonian? Phyllite,Quartzite,Argillite,Schist,Chert AK(ne),YU Kekiktuk Conglomerate/Kayak Road River marine invertebrates (very sparse) GEOLEX unit_11431 [http://weblex.nrcan.gc.ca/html/010000/GSCC00053010650.html]

Nesson

80m Jurassic-Lower-Jurassic,Middle Anhydrite,Shale,Dolomite,Limestone MT(e),ND(w),SD(nw)? ? Piper Gypsum Spring fossils: GEOLEX link NO cgkn link

Nevada Limestone

An obsolete term for as much as 1650 meters of Lower and Middle Devonian limestone, shale and quartzite found in Nevada(ec). It overlies the Lone Mountain Formation/Ogden Quartzite and is overlain by the White Pine Shale/Pilot Shale. Usage of the name was formally abandoned in 1983 in favor of individual formations: Beacon Peak Dolomite,Grays Canyon Limestone,Oxyoke Canyon Sandstone,Sentinel Mountain Dolomite,Woodpecker Limestone,South Hill Sandstone,Bay State Dolomite

Fossils: Sometimes abundant marine invertebrates brachiopods,corals,tentaculites,trilobites, fish teeth

Newark Canyon

549m Cretaceous,Lower limestone,conglomerate,silt,sand NV(ec) Carbon Ridge Illipah fossils:? GEOLEX link NO cgkn link

Ninemile Formation

Early Ordovician shale limestone and dolomite. It underlies the Antelope Valley Formation and overlies the Goodwin Limestone.

Fossils: Trilobites

Nippewalla

283m Permian,Lower sandstone/shale CO,NE,KS Stone Corral/Sumner Blaine/Whitehorse fossils: GEOLEX link NO cgkn link Nippewalla

Nisku Limestone

45 meters of Upper Devonian limestone found in Alberta,Manitoba(?),Montana(n),North Dakota,South Dakota(nw) and Saskatchewan. No surface exposures? Overlies the Ireton Formation and is overlain by the Lyleton formation/Calmar Formation. It is the oldest member of the Qu'Appelle Group

Fossils: corals, bryozoa, stromatoporoids, algae

Noah Formation

100 meters(?) of undescribed Upper Devonian dolomites found in Utah. It is a member of the Bluebell dolomite. It overlies the Dora Dolomite and is possibly overlain by the Victoria Quartzite/Gardner Limestone

Fossils: Possibly a few

Noatak Sandstone

274m Devonian Upper-Mississippian Lower sandstone,shale AK(n) Lisburne Kanayut brachiopods,bryozoans,blastoids,trilobites,fish fragments,poorly preserved plant fossils GEOLEX http://ngmdb.usgs.gov/Geolex/NewRefsmry/sumry_11450.html NO cgkn link Endicott Group

Nonda

612m Silurian,Lower dolomite,quartzite,chert BC,YT Sunblood Muncho-McConnell Ronning fossils:Brachiopods,trilobites,colonial corals,stromatoporoids NO GEOLEX link cgkn link

Nopah Dolomite

Up to 450 meters of Upper Cambrian Dolomite, limestone and shale found in the SouthWestern Great Basin and Colorado Plateau. The Nopah overlies the Bonaza King Dolomite and underlies the Pogonip Group. The Nopah apparently includes some other formations including the Dunderberg Shale in the Great Basin; the Muav Limestone in the Colorado Plateau; and the Cornfield Spring Formation in California.

Fossils: Abundant in some beds: brachiopods, trilobites, conodonts, mollusks, sponges, chancelleroids, stromatolites

Noonday Dolomite

About 300 meters of latest Proterozoic cap carbonate rocks -- dolomites and limestones deposited in the SouthWestern Great Basin of California and Nevada at the end of the Varanger glaciation. It overlies the Kingston Peak Formation and is overlain by the Johnnie Shale

Fossils: None

North Horn

503m Cretaceous,Upper-Eocene coal,shale,sandstone,limestone UT Price River Flagstaff/Cedar Breaks fossils: vertebrates(dinosaurs,mammals) GEOLEX link NO cgkn link

NotchPeak

600 meters of Upper Cambrian and Lower Ordovician limestone, mudstone, and dolomite found in Nevada(e) and Utah(w). It overlies the Orr Formation and is overlain by the House Limestone.

Fossils: Stromatolites, marine invertebrates(?)

Nounan

317m Cambrian,Middle-Cambrian,Upper limestone UT(ec) Bloomington Formation St Charles fossils:marine invertebrates GEOLEX link NO cgkn link

Nyarling Formation

128m Devonian Middle gypsum,limestone AB,NT Little Buffalo Slave Point Pine Point fossils NO GEOLEX link [http://weblex.nrcan.gc.ca/html/011000/GSCC00053011098.html]

Obregon

38m Pennsylvanian,Upper shale,limestone,sandstone,conglomerate,coal TX(nc) Speck Mtn/Chaffin fossils: GEOLEX link NO cgkn link Thrifty

Ocate

Jurassic,Middle NM(ne) Entrada GEOLEX link NO cgkn link

Obsolete name for Entrada Formation used in NM(ne) -- Geolex link |

Ochre Mountain Limestone

1372m Mississippian,Upper limestone,dolomite,shale UT(wc) Woodman | fossils:abundant GEOLEX link NO cgkn link

Ogden Quartzite

A nineteenth century term for 500 meters of unfossiliferous white quartzite found in Nevada(w) and Utah(n). Originally thought to be Devonian, it was much later redescribed as a faulted in Cambrian material. It overlies the Ute limestone and underlies the Wahsatch limestone/Nevada Limestone.

Fossils:

Ogilvie

637m Devonian Lower-Devonian Middle limestones AK(ec),YU(w) Road River/Jones Ridge ? McCann Hill/Hume/Hare Indian fossils-Moderately abundant fauna-sponges,stromatoporoids,tabulate corals,brachiopods,cephalopods,gastropods,pelecypods,goniatites,cricoconarids,ostracodes,trilobites,echinoderm(fragments),conodonts GEOLEX http://ngmdb.usgs.gov/Geolex/NewUnits/unit_15568.html cgkn http://weblex.nrcan.gc.ca/html/011000/GSCC00053011160.html

Okpikruak

731m Jurassic,Upper-Cretaceous,Lower sandstone,clay,shale,conglomerate AK(n) Kingak Shale Torok bivalves(sparse) GEOLEX http://ngmdb.usgs.gov/Geolex/NewUnits/unit_11479.html NO cgkn link

Old Cabin Formation

500m Paleozoic Lower volcanics YU Gull Lake Steel a single archeocyathid NO GEOLEX link cgkn http://weblex.nrcan.gc.ca/html/017000/GSCC00053017227.html

Old Fort Island

30m Cambrian Lower-Cambrian Middle sandstone,minor shale YU Backbone Ranges No fossils? NO GEOLEX link cgkn http://weblex.nrcan.gc.ca/html/011000/GSCC00053011205.html

Olcese Sand

74m Miocene,Lower-Miocene,Middle sand,silt,gravel,clay CA(sc) Freeman Silt/Walker Round Mountain Silt fossils:invertebrates-gastropods,forams GEOLEX link NO cgkn link

Onate Formation

about 28 meters of Middle Devonian siltstone, limestone,shale and marl found in New Mexico(sc) It overlies the Fusselman Dolomite and is overlain by the Sly Gap Formation

Fossils: Shallow water marine invertebrates-crinoids,bryozoa, brachiopods

Opeche shale

30 meters or more of unfossiliferous red Permian sandstone and purple shales sometimes with some evaporites found in Colorado(nc),Montata,Nebraska(nw),North Dakota,South Dakota(w) and Wyoming. It overlies the Minnelusa formation and is overlaain by the Minnekahta limestone

Fossils: None

Open Door Limestone

180 meters of Upper Cambrian limestone with a basal green shale found in Wyoming(w) It overlays the Du Noir Formation and is overlain by the Bighorn Dolomite

Fossils: Trilobites in lower beds.

Opex

120 meters of Upper Cambrian limestone and dolomite found in Utah(c). It overlies the Cole Canyon Dolomite and Ajax Dolomite

Fossils: Marine invertebrates

Ophir

Up to 1400 meters of Middle Cambrian Sandstone/Shale/limestone found in Arizona(ne),Colorado,Nevada(se),New Mexico, and Utah. It overlies the Tintic Quartzite and is overlain by the Hartmann Limestone/Maxfield Limestone/Pinyon Peak

Fossils: A few brachiopods and trilobites in the basal beds

Opohonga Limestone

300 meters or more of Lower Ordovician varicolored limestone found in Utah. It overlies the Ajax Limestone and is overlaid by the Bluebell Dolomite/Fish Haven Dolomite.

Fossils: A few poorly preserved trilobites and brachiopods

Oquirrh

2400 meters or more of Upper Carboniferous (Uppermost Mississippian to Permian) limestones and sandstones found in Idaho(se) and Utah(nc) It overlies the Manning Canyon Shale and is overlain by the Gerster Formation/Curry Peak Formation/Phosphoria Formation

Fossils: Abundant marine invertebrates - corals, bryozoa, fusilinids

Organ Rock

457m Permian,Lower sandstone,shale AZ(ne),CO(sw),NM(nw),UT(se) Cedar Mesa DeChelly Hermit/Supai fossils:plants,invertebrates GEOLEX link http://ngmdb.usgs.gov/Geolex/NewUnits/unit_9691.html NO cgkn link Cutler

Orinda

? Miocene ? CA(wc) ? Livermore gravels fossils: GEOLEX link NO cgkn link

Orr

556 meters of Upper Cambrian gray limestones bracketing a gray shale interval found in Nevada(e) and Utah(w). It overlies the Weeks Limestone/Wah Wah Summit Formation and is overlain by the Notch Peak Limestone.

Fossils: Marine Invertebrates-trilobites,brachiopods in mudstone

Osha Canyon Formation

21.6 meters of Lower Pennsylvanian limestone and shale found in New Mexico(nc). It overlies the Log Springs Formation and is overlain by the Sandia Formation/Madera Formation

Fossils: abundant marine invertebrates-especially in the limestones

Ospika Formation

455m Silurian shale,limestone,dolostone,mudstone,quartzite BC Pesika Kwadacha fossils? NO GEOLEX link cgkn http://weblex.nrcan.gc.ca/html/017000/GSCC00053017078.html Road River

Otter Formation

200 meters or more of Upper Mississippian shales and thin limestones found in Montana and North Dakota. It overlies the Kibbey Sandstone and is overlain by the Ellis Group. It is a member of the Quadrant Formation of the Big Snowy Group

Fossils: Marine invertebrates - brachiopods, etc

Otter Park Formation

165m Devonian,Middle shale BC(ne),NT(sw) Evie/Slave Point Muskwa Slave Point/Pine Point fossils? NO GEOLEX link cgkn http://weblex.nrcan.gc.ca/html/016000/GSCC00053016854.html Horn River

Ottertail Formation

750m Cambrian,Upper mudstone,limestone,chert BC(w) Chancellor McKay Group/Goodsir Group Lyell/Jubilee fossils? NO GEOLEX link cgkn http://weblex.nrcan.gc.ca/html/011000/GSCC00053011396.html

Otuk Formation

? Triassic-Jurassic shale,chert,limestone AK(n) [Siksikpuk #Siksikpuk ] ? bivalves,conodonts,ammonoids GEOLEX http://ngmdb.usgs.gov/Geolex/NewUnits/unit_11505.html NO cgkn link Etivluk Group

Ouray Limestone

Up to 250 meters of Upper Devonian and Lower Mississippian white or pink limestone, shale, clay found in Arizona(ne), Colorado(sw), New Mexico(nw) and Utah(s). It overlies the Tomichi limestone and underlies the Garfield formation/Leadville limestone

Fossils: marine invertebrates in upper layers - corals, nautiloids, brachiopods, crinoids, gastropods

Oursan

122m Miocene sandstone,tuff CA(wc) Claremont Tico Shale fossils:marine invertebrates GEOLEX link http://ngmdb.usgs.gov/Geolex/Units/Oursan_13993.html NO cgkn link Monterey

Overall

5m Permian,Lower limestone TX(nc) Wildcat Creek fossils:bivalves,algae,brachiopods GEOLEX link NO cgkn link Admiral

Owen Creek

199m Ordovician,Middle dolomites,sandstones,siltstones AB(sw),BC(se) Skoki Mount Wilson Glenogle -- Not to be confused with the Lower Cambrian Owen Creek formation of MD,VA,WV fossils:A few marine invertebrates NO GEOLEX link cgkn link http://weblex.nrcan.gc.ca/html/011000/GSCC00053011427.html

Owl Canyon

84 meters of Lower Permian tidal flat/estuarian sandstone and shale found in Colorado(NE), SouthDakota(SW), and Wyoming(SE). It overlies the Broom Creek Formation/Meek Formation/Wendover Formation/Hayden Formation and is overlain by the Lyons Formation. It has been included in the Cassa Formation and Hartville Formation

Fossils: Marine invertebrates?

Owl Rock

137m Triassic,Upper Siltstone,Limestone AZ(ne),CO(sw),NM(nw),UT(se) Petrified Forest/Moss Back Church Rock/Wingate Church Rock fossils:bivalves,gastropods,petrified wood,vertebrates(aquatic-uncommon) GEOLEX link NO cgkn link Chinle

Oxyoke Canyon Sandstone

125 meters of Lower and Middle Devonian sandstone found in Nevada(ec). It overlies the Beacon Peak Dolomite/Sadler Ranch formation and is overlain by the Sentinel Mountain dolomite. It is a member of the Nevada Formation

Fossils: Unknown

Outram

443m Ordovician,Lower limestone,shale AB(sw),BC(se) Survey Peak Skoki Glenogle fossils:trilobites, brachiopods, conodonts, gastropods, sponges, pelecypods, cephalopods, echinoderm fragments,graptolies(extremely rare) NO GEOLEX link cgkn link

Pacheco

? Jurassic-Cretaceous ? CA(sc) ? Panoche fossils:? GEOLEX link NO cgkn link

Pagoda Limestone

122m Cambrian,Middle limestone,oolite,shale MT(nw) Dearborn Limestone/Steamboat Limestone Pentagon Shale Wolsey Shale/Meagher Limestone| fossils:a few trilobites GEOLEX http://ngmdb.usgs.gov/Geolex/NewUnits/unit_9741.html NO cgkn link Groupis

Pahasapa limestone

150 meters of massive, gray, or red stained Lower Mississippian limestone found in Nebraska(w), South Dakota(sw) and Wyoming(se) It overlies the Englewood limestone and is overlain by the Minnelusa formation

Fossils: sparse marine invertebrates

Pahrump Group

A series of mostly marine late Proterozoic sediments found in the SouthWestern Great Basin of Nevada and California. It consists of the (oldest first)Crystal Spring Formation,Beck Spring Formation and Kingston Peak Dolomite. It overlies unnamed intrusives and gneisses. It is overlain by the Noonday Dolomite.

Fossils: stromatolites, microbes, obscure fossils, ediacarans in the topmost beds.

Pahrump Hills Shale

Up to 94 meters of Middle Cambrian shale and siltstone found in Death Valley and adjacent Nevada. It overlies the Red Pass Limestone and is overlain by the Thimble Limestone. It is a member of the Carrara Formation.

Fossils: Middle Cambrian trilobite fragments

Paine Limestone

70 meters of Lower Mississippian limestone found in Idaho, Montana, Utah, and Wyoming. It overlies the Three Forks Formation and is overlain by the Woodhurst member. It is considered to me a member of the Lodgepole Limestone/Madison Limestone/Tendoy Group

Fossils: corals, brachiopods, forams, conodonts

Paint Rock

? Permian,Lower limestone TX(c) ? ? Taloga fossils: GEOLEX link NO cgkn link

Pakoon Limestone

260 meters of Lower Permian limestone and dolomite found in Arizona, Nevada, and Utah. It overlies the Callville Limestone and is overlain by the Queantoweap Sandstone. It may be a member of the Supai Group

Fossils: fusulinids in one bed

Palliser Limestone

Up to 580 meters of fossiliferous Upper Devonian limestones found in the Rocky Mountains of Alberta dn British Columbia. It overlies the Alexo Formation and is overlain by the Exshaw Formation. It is contemporaneous with the Wabamun Group, the Three Forks Formation, Tetcho formation, Kotcho formation and Besa River Shale. It is sometimes divided into Morro and Costigan members.

Fossils: Dated from brachiopods

Palmetto Formation

Ordovician shale, limestone, and chert found in the Silverpeak area of Nevada and adjacent California. It overlies the Emigrant Formation

Fossils: graptolites. Inarticulate brachiopods

Palo Pinto

30m Pennsylvanian,Upper limestones TX(c) Strawn Graford fossils:Marine invertebrates(mollusks) GEOLEX link NO cgkn link Canyon

Palos Verdes Sand

5m Pleistocene,Upper sand,gravel CA(sw) pleistocene? pleistocene fossils: echinoids,bivalves GEOLEX link NO cgkn link

Panoche

9144m Cretaceous,Upper sandstone/clay CA(wc) Pacheco/Knoxville/Paskenta/Franciscan Moreno/Oursan(?)/Cierbo/Neroly/Livermore gravels
Horsetown/Paskenta/Knoxville fossils:marine invertebrates GEOLEX link NO cgkn link

Pancho Rico

200m+ Pliocene sandstone,mudstone,conglomerate CA(wc) Monterey/Santa Margarita Paso Robles fossils: marine mollusks GEOLEX link NO cgkn link Groupis

Panther Seep

732m Pennsylvanian,Upper-Permian,Lower Shale,Siltstone,Sandstone,Gypsum, Limestone NM(sw),TX Bishops Cap Hueco Limestone/Bursum Formation fossils:marine invertebrates GEOLEX link http://ngmdb.usgs.gov/Geolex/NewRefsmry/sumry_9759.html NO cgkn link Magdalena

Papoose Creek Siltstone

122m Proterozoic,Upper quartzite ID(se),UT Blackrock Canyon Limestone Caddy Canyon Quartzite fossils:None GEOLEX link http://ngmdb.usgs.gov/Geolex/NewRefsmry/sumry_6117.html NO cgkn link

Paradise

47m Mississippian,Upper cyclic Limestone,Sandstone,Shale AZ(se),NM(sw) Escabrosa/Hachita Naco fossils:marine invertebrates(abundant,sometimes poorly preserved)-plants GEOLEX link http://ngmdb.usgs.gov/Geolex/NewUnits/unit_9762.html NO cgkn link

Paradox

3650m? Pennsylvanian Middle cyclic Salt,Gypsum,Anhydrite,Shale,Sandstone,Limestone AZ(ne),CO(sw),NM(nw),UT(se) Molas #Molas/[Pinkerton Trail Hermosa/Honaker Trail Madera/Oquirrh/Sandia/Naco/Supai/Belden/Gothic fossils:conodonts,marine invertebrates,plants GEOLEX http://ngmdb.usgs.gov/Geolex/NewUnits/unit_9763.html No cgkn link Hermosa

Paris Peak Formation

41m Ordovician Upper dolomite ID(se),NV,UT(nw) Swan Peak Deep Lakes Fish Haven Dolomite fossils-corals GEOLEX http://ngmdb.usgs.gov/Geolex/NewUnits/unit_9766.html No cgkn link

Parks Mountain

21m Pennsylvanian,Upper sandstone,conglomerate TX(c) Lohn Chaffin fossils: GEOLEX link NO cgkn link Cisco

Park Shale

244m Cambrian Middle shale,sandstone,conglomerate ID(se),NV,UT(nw) Meagher Limestone/Death Canyon/Wolsey Pilgrim Limestone/Maurice/Du Noir Bloomington/Bayhorse dolomite/Switchback shale/Gros Ventre/Steamboat Limestone/Hasmark dolomite/Flathead Sandstone fossils:trilobites,hyolithes GEOLEX http://ngmdb.usgs.gov/Geolex/NewRefsmry/sumry_9767.html No cgkn link Gros Ventre/Barker/Emerson

Park City

About 213 meters of Permian limestone and sandstone found in Colorado(nw),Idaho(s),Montana,Nevada(ne),Utah(n),and Wyoming(w). It overlies the Woodside Quartzite

Fossils: Marine invertebrates?

Parker Spring Shale

Thin bedded Lower Ordovician shale and limestone found in Eastern Nevada. It is a member of the Pogonip group. It overlies the House Limestone and is overlain by the Shingle Limestone

Fossils: Conodonts, trilobites?, other megafossils?

Parting Formation

30m? Devonian Upper quartzite CO(c) Manitou/Harding Dyer fossils:conodonts,brachiopods,fish GEOLEX http://ngmdb.usgs.gov/Geolex/NewUnits/unit_9779.html No cgkn link Chaffee

Paskenta

? Cretaceous ? CA(n) Horsetown Panoche fossils:? NO GEOLEX link NO cgkn link

Paso Robles

300m+ Miocene-Pleistocene sand,conglomerate CA(wc) Pancho Rico,Purisima,Santa Margarita Aromas gastropods(non-marine?) GEOLEX link NO cgkn link

Pass Creek

305m Pennsylvanian Sandstone,Siltstone,Shale,Limestone CO(sc) Madera Sangre de Cristo fossils:none GEOLEX http://ngmdb.usgs.gov/Geolex/NewUnits/unit_9781.html No cgkn link

Paul River

? Devonian,Lower shales,siltstones BC(ne) Road River? Gunsteel Akie Reef/Kwadacha Reef fossils:Graptolites NO GEOLEX link NO cgkn link

Paymaster

190m Mississippian,Upper Limestone,Shale,Quartzite UT(c) Topliff Chiulos fossils:? GEOLEX http://ngmdb.usgs.gov/Geolex/NewUnits/unit_9791.html NO cgkn link Great Blue

Pease River

158m? Permian,Lower sandstone,shale TX Clear Fork Cretaceous/Pleistocene fossils: GEOLEX link NO cgkn link Pease River

Peechee

300m Devonian,Upper dolomite,minor limestone BC(se),AB(sw) Cairn Grotto/Ireton Grosmont,Leduc,Duperow,Jefferson fossils:locally marine invertebrates NO GEOLEX link cgkn link http://weblex.nrcan.gc.ca/html/011000/GSCC00053011629.html Fairholme

Peerless

107m Cambrian,Upper dolomite,shale CO(c) Sawatch Manitou fossils: ichnofossils GEOLEX link http://ngmdb.usgs.gov/Geolex/NewUnits/unit_9573.html NO cgkn link

Peers Spring

? Mississippian,Upper? ? NV ? Chainman/Diamond Peak fossils:? GEOLEX link http://ngmdb.usgs.gov/Geolex/NewUnits/unit_14065.html NO cgkn link

Pekisko Formation

134m MIssissippian,Lower limestone AB(sw) Banff Shunda Shunda/Livingstone fossils:crinoid fragments NO GEOLEX link cgkn link http://weblex.nrcan.gc.ca/html/011000/GSCC00053011645.html

Pentagon Shale

88 meters Cambrian Middle limestone,shale MT(nw) Pagoda Oolite Gordon Mountain Limestone/Steamboat Limestone Wheeler/Marjum/Bloomington fossils:trilobites,brachiopods GEOLEX http://ngmdb.usgs.gov/Geolex/NewUnits/unit_9582.html NO cgkn link

Pequop

479m Permian,Lower limestone,sandstone,siltstone NV(ce),UT(cw) Ferguson Mountain,Riepetown| Loray fossils:fusulinids GEOLEX link NO cgkn link Arcturus,Carbon Ridge

Percha Shale

85m Devonian,Upper shale,siltstone,limestone AZ(s),NM(s),TX(w) Fusselman/Cutter Fierro/Lake Valley/Escabrosa fossils:corals,gastropods,bryozoa,fish fragments GEOLEX link http://ngmdb.usgs.gov/Geolex/NewUnits/unit_9588.html NO cgkn link

Perdido Formation

139m Mississippian siltstone,quartzite,sandstone CA(ec) Vaughn Gulch #VaughnGulch Chainman ? fossils:ammonites GEOLEX link http://ngmdb.usgs.gov/Geolex/NewUnits/unit_14075.html NO cgkn link ?

Perdrix

116m Devonian,Upper shale,limestone AB(sw),BC(se) Maligne/Flume Mt Hawk Cairn/Peechee fossils: Tentaculitds,brachiopods,bivalvia NO GEOLEX link cgkn link http://weblex.nrcan.gc.ca/html/011000/GSCC00053011713.html Fairholme

Pesika

230m Silurian dolomitic limestone,shale BC Kwadacha Ospika fossils:Graptolites NO GEOLEX link cgkn link http://weblex.nrcan.gc.ca/html/017000/GSCC00053017070.html

Petrified Forest

244 Triassic,Upper Sandstone/Shale/Conglomerate/Gypsum/Limestone AZ(n)/CO(sw)/NV(se)/NM(nw)/UT(se) Moss Back/Monitor Butte/`Mesa Redondo/Shinarump Owl Rock/Springdale/Moenave fossils:petrified wood(abundant) GEOLEX link cgkn link Chinle

Peyto

125m Cambrian,Lower limestone AB(sw) Gog Group Mt Whyte equivalent fossils:trilobites NO GEOLEX link cgkn link

Phi Kappa

2865+ Ordovician,Lower-Silurian,Middle quartzite,argillite,shale,sandstone ID(c) East Fork Trail Creek fossils:graptolites GEOLEX link NO cgkn link

Phosphoria

137m Permian,Lower Limestone,Shale,Phosphorite,Chert AB,ID(e).MT(sw),NV(ne),UT(n),WY(w) Wells Woodside/Dinwoody Park City fossils:sponge spicules,brachiopods,crinoid stems GEOLEX link http://ngmdb.usgs.gov/Geolex/NewUnits/unit_9611.html NO cgkn link Phosphoria

Pico

? Pliocene-Pleistocene rocks CA(sw) Towsley Fernando/Las Posas fossils: GEOLEX link NO cgkn link

Pierson Cove

370m Cambrian,Middle mudstone,limestone UT(w) Eye of Needle Limestone,Wheeler Trippe Limestone Highland Peak,Pioche,Marjum fossils:marine invertebrates GEOLEX link No cgkn link Groupis

Pika

361m Cambrian,Cambrian limey mudstone,dolomite Alberta(sw) Eldon/Titkana/Earlie Arctomys/Sullivan/Waterfowl Chancellor fossils-? NO GEOLEX link cgkn link http://weblex.nrcan.gc.ca/html/011000/GSCC00053011838.html

Pilgrim Limestone

201.5 Cambrian,Upper limestone,dolostone,shale ID(se),WY,MT Park Shale Dry Creek Shale Maurice/Hasmark/Red Lion/Devils Glen fossils-trilobites,brachiopods(fairly abundant in some beds) GEOLEX link http://ngmdb.usgs.gov/Geolex/NewRefsmry/sumry_9630.html No cgkn link Barker

Pilot Shale

122m Devonian,Upper-Mississippian,Lower shale,minor limestone NV,UT(w) Guilmette Joana Limestone fossils-Conodonts GEOLEX link http://ngmdb.usgs.gov/Geolex/NewRefsmry/sumry_9638.html No cgkn link

Pine Canyon Limestone

An obsolete name for the Mississippian Deseret Limestone in Central Utah.

Pine Point

213m Devonian dolostone,limestone AB,BC,NT Lonely Bay/Keg River Sulphur Point/Watt Mountain Sulphur Point/Lonely Bay fossils: poorly preserved marine invertebrates NO GEOLEX link cgkn links http://weblex.nrcan.gc.ca/html/011000/GSCC00053011879.html http://weblex.nrcan.gc.ca/html/017000/GSCC00053017308.html

Pinecone

300m Ordovician ? NV(c) ? Wildcat Peak Vinini fossils: GEOLEX link NO cgkn link

Pinkerton Trail

180m Pennsylvanian,Middle limestone,shale AZ(ne),CO(sw),NM(nw),UT(se) Molas/Lime Ridge Paradox Oquirrh/Sandia/Naco/Belden fossils: fusulinids,crinoid fragments GEOLEX link http://ngmdb.usgs.gov/Geolex/NewUnits/unit_9812.html NO cgkn link Hermosa

Pinyon Peak

115m Devonian,Upper shaly limestone UT(c) Bluebell Victoria #Victoria[/[Fitchville fossils: ichnofossils,brachiopods, gastropods, bryozoans GEOLEX link http://ngmdb.usgs.gov/Geolex/NewRefsmry/sumry_9816.html NO cgkn link [

Pioche Shale

Up to 80 meters of fossiliferous Lower and Middle Cambrian shale with minor thin limestones found in Eastern Nevada and Western Utah. It is subdivided into Comet Shale and Forlorn Hope Formation. It overlies the Prospect Mountain Quartzite and is overlain by the Howell Formation. It is laterally equivalent to the Carrara Formation/Bright Angel Shale

Fossils: trilobites,brachiopods,others.

Piper

91m Jurassic,Middle Redbeds,Shale,Gypsum,Limestone,Dolomite MT,ND(w),WY(e) [Gypsum Spring #./MIDCONT.HTM#GypsumSpring]/Nesson,Spearfish Reirdon,Sundance Gravelbourg/Shaunavon/Sawtooth/Watrous fossils:a few ammonites,gastrpods GEOLEX link cgkn link Ellis Group

Placid Shale

15m Pennsylvanian,upper shale,sandstone,limestone TX(c) Clear Creek Ranger Ventioner fossils:locally abundant marine invertebrates GEOLEX link NO cgkn link Canyon

Plympton

210m Permian,Lower dolomite,chert NV(ec),UT(wc) Kaibab Gerster Formation Phosphoria Group,Oquirrh Group fossils:None GEOLEX link NO cgkn link Park City Group

Pocatello

442m Precambrian slate,tillite ID(se),UT(n) Bannock Blackrock Canyon fossils:None GEOLEX link http://ngmdb.usgs.gov/Geolex/NewRefsmry/sumry_9848.html NO cgkn link

Pogonip Group

Up to 1000 meters of Uppermost Cambrian to Early Middle Ordovician limestones,dolomites,shales and quartzites found in California, Nevada, Utah and Idaho. The Pogonip is divided into a number of members (alphabetical): Antelope Valley Limestone (CA,NV), Deadman Spring Dolomite (UT), Fillmore Limestone (NV,UT),Goodwin Limestone (NV*),House Limestone (NV,UT),Juab Limestone (NV,UT), Kanosh Shale (NV,UT), Lehman Formation NV,UT), Mazourka Formation (CA), Ninemile Formation (NV), Parker Spring Formation (NV), Shingle Limestone (NV), Tank Hill Limestone (NV),Stoneberger Shale (NV), WahWah Limestone (NV,UT), Watson Ranch Quartzite (UT), Yellow Hill Limestone (NV). It overlies the Nopah Formation and is overlain by the Eureka Quartzite.

Fossils: abundant fossils in some beds

Point Loma

400m Cretaceous,Upper sandstone,shale,siltstone CA(sw) Lusardi Cabrillo fossils:foraminifers,mollusks,coccoliths GEOLEX link http://ngmdb.usgs.gov/Geolex/Units/PointLoma_11610.html NO cgkn link Rosario

Poker Knoll Limestone

200m? Mississippian,Upper limestone,chert UT(c) Chiulos Manning Canyon fossils-unknown GEOLEX link NO cgkn link Great Blue

Poleta Formation

Fossiliferous Lower Cambrian shales and limestones found in the area of the Inyo,White,and Silverpeak ranges in California and Nevada. It consists of upper and lower limestone members with an intermediate shale. It overlies the Campito Formation and is overlain by the Harkless Shale. It is part of a thick sequence of Middle Cambrian, Lower Cambrian and late Proterozoic outer shelf sediments with different nomeclature than the corresponding nearer shore sediments found further East.

Fossils: Trilobites, archeocythids, others.

Poplar

152m Mississippian limestones,dolomites,evaporites SK Ratcliffe Kibbey Limestone fossils:sufficent corals and brachiopods for dating NO GEOLEX link cgkn link Subsurface Only?

Porter Shale

? Oligocene shale WA ? ? fossils? GEOLEX link NO cgkn link Groupis

Portrait Lake

876m Devonian shale,chert,sandstone,conglomerate NT,YU Nahanni/Funeral/Grizzly Bear/Sapper/Haywire/Steel Prevost fossils-graptolites,conodonts,cephalopods NO GEOLEX link cgkn link Earn

Poway Conglomerate

305m Eocene,Middle-Eocene,Upper conglomerate,sandstone CA(SW) La Jolla/Friars/bedrock San Diego fossils: GEOLEX link NO cgkn link Poway

Prairie Evaporite

218m Devonian,Middle salt,anhydrite,dolostone,limestone,shale AB,MB,MT,ND,SK Winnipegosis Dawson Bay fossils-none? GEOLEX cgkn link Elk Point

Presqu'ile Dolomilte

300m Devonian,Middle dolomite BC,NT Keg River| Watt Mountain Muskeg fossils- Corals,brachiopods,stromatoporoids,gastropods,cephalopods,crinoids,Amphipora NO GEOLEX link cgkn link

Prevost

305m Devonian,Upper-Mississippian,Lower shale,sandstone,conglomerate NT,YT Portrait Lake Tsichu fossils-none? No GEOLEX link cgkn link Earn

Prince Creek

713m Cretaceous-Upper-Paleocene conglomerate,coal,shale,bentonite AK(ne) Nanushuk Sagavanirktok/Gubik fossils:mollusks(fresh water) GEOLEX link NO cgkn link Colville

Prongs Creek

751m Devonian shale,limestone,chert YT Road River Canol/Imperial fossils No GEOLEX link cgkn link

Prophet Formation

760m Mississippian,Lower chert,limestone,shale,marlstone,dolomite BC,NT,YT Besa River Golata Shunda fossils-corals,brachiopods,pelmetazoa No GEOLEX link cgkn link

Prospect Mountain Quartzite

Many hundreds of meters of Lower Cambrian quartzites, sandstones, and shales found in the Western Great Basin of Western Utah, Nevada, and California. It is laterally equivalent to the Stirling Quartzite, Wood Canyon Formation, Zabriskie Quartzite, parts of the Carrara Formation, Tapeats Formation and (probably) the Campito, Poleta, and Harkless Formations of the Inyo, White, and Silverpeak Mountains. Where its base is exposed, it generally overlies proterozoic metasediments or intrusives although some authors have broken out the older beds as the Brigham Group or Goshute Canyon Formation. It is overlain by the Pioche Shale/Cabin Shale/Eldorado Limestone.

Fossils: ichnofossils.

Pueblo

61m Pennsylvanian,Upper-Permian,Lower limestone,sandstone TX(c) Harpersville Moran fossils:marine invertebrates GEOLEX link NO cgkn link Cisco

Puente

2591+m Middle,Middle-Miocene,Upper Shales,sandstone CA(sw) bedrock/Topanga Fernando/Repetto fossils:? GEOLEX link NO cgkn link

Purcell Group

10000m Proterozoic,Middle siltstone,sandstone,limestone BC,ID,MT,WA crystalline basement rocks Windermere Group/Paleozoic beds Belt fossils GEOLEX link NO cgkn link Purcell

Purisima

320m Miocene-Pliocene sandstone,mudstone CA(wc) Santa Margarita Aromas fossils: invertebrates,vertebrates-fish,birds GEOLEX link NO cgkn link

Putnam

46m Permian,Lower shale,limestone,sandstone TX(c) Moran Admiral Placid Shale/Winchell fossils:present GEOLEX link NO cgkn link Canyon

Pyramid Shale

Up to 172 meters of Lower and Middle Cambrian shale and siltstone found in Death Valley and adjacent Nevada. It overlies the Gold Ace Limestone/Echo Shale and is overlain by the Red Pass Limestone. It is a member of the Carrara Formation.

Fossils: Ollenelid trilobites

Qu'Appelle Formation

61+m Devonian,Upper siltstone,dolomite,limestone,shale MB(sw),MT(n),ND(w),SD(nw)?,SK(s) Nisku Exshaw Lyleton/Three Forks fossils:None? GEOLEX link cgkn link QuApple

Quadrant Quartzite

107m Mississippian,Upper-Permian,Lower quartzite,limestone ID,MT,WY Madison Ellis Group fossils:brachiopods,bryozoa,corals GEOLEX link NO cgkn link

Quartermaster

91m Permian,Middle-Permian,Upper clay,sandstone,shale,gypsum KS,NM,OK,TX Day Creek Dockum Group fossils: GEOLEX link NO cgkn link

Queantoweap Sandstone

133m Permian,Lower sandstone AZ(nw),NV(se) Pakoon/Callville/Bird Spring Hermit/Toroweap Supai/Esplanade fossils:None? GEOLEX link NO cgkn link

Rabbit Hill Limestone

? Devonian,Lower limestone NV ? McColley Canyon fossils? GEOLEX link NO cgkn link

Rabbitkettle

800m Cambrian,Upper,Ordovician,Lower limestone,siltstone,shale NT,YT unnamed older rocks Road River fossils:trilobites NO GEOLEX link cgkn link

Railroad Canyon

260m Mississippian,Upper Conglomerate,Siltstone,Shale,Limestone ID(se),MT(sw) Scott Peak Bluebird Mtn Lombard Limestone/Conover Ranch/Surrett Canyon/Arco Hills fossils:brachiopods,conodonts GEOLEX link NO cgkn link

Rainvalley Formation

130m Permian Limestone AZ(se),NM Concha Limestone Late Mesozoic conglomerate fossils:brachiopods,corals,gastropods,cephalopods GEOLEX link NO cgkn link Naco

Ralston

? Eocene ? WY(nc) Goose Egg/Lykins ? ? fossils:? GEOLEX link NO cgkn link

Rampart Group

thick Mississippian-Triassic limestone,shale,volcanics AK(ec) Circle Tahkandit Limestone fossils:a few marine invertebrates GEOLEX link NO cgkn link Rampart

Ramparts Formation

245 Devonian,Middle limestones NT Hare Indian Canol/Imperial Beavertail? fossils:brachiopods,corals,strotoporoids,ostracods NO GEOLEX link cgkn link

Ramshorn Slate

600m+ ordovicion slate ID(c) Bayhorse Kinnikinic fossils:graptolites GEOLEX link NO cgkn link

Rancheria Formation

78m Mississippian limestone,chert NM(sw),TX(w) Las Cruces Helms fossils:plants,brachiopods GEOLEX link NO cgkn link

Ranchester

77m Mississippian,upper-Pennsylvanian limestone,dolomite,sandstone,shale MT(sw),WY(nc) Horseshoe Shale Tensleep Morgan/Casper/Fountain/Hartville/Minnelusa fossils:marine invertebrates GEOLEX link NO cgkn link Amsden

Ranger

18m Pennsylvanian,Upper limestone TX(c) Milburn-Strawn/Graford Waldrip-Cisco/Eastland fossils:marine invertebrates-brachiopods,bryozoa GEOLEX link NO cgkn link

Ranger Canyon chert

30m Permian chert,sandstone,siltstone,gypsum,phosphates BC(se),AB(sw) Ross Canyon Spray River/Mowitch ? fossils:sponge spicules,brachiopods in some localities NO GEOLEX link cgkn link

Rapitan

1500m Proterozoic tillites NT,YT Twitya fossils:? NO GEOLEX link cgkn link

Ratcliffe Interval

80m Mississippian,Upper Dolomite,Mudstone,Anhydrite MT,ND,SK Midale Poplar Turner Valley fossils:Corals,brachiopods GEOLEX link cgkn link Madison subsurface only?

Reagan Sandstone

91 Cambrian,Upper sandstone,shale,arkose KS,MO,OK igneous rocks Arbuckle/Cap Mountain Lamotte fossils:marine invertebrates GEOLEX link cgkn link

Reclamation

77m Pennsylvanian,Middle limestone,shale NE,ND,SD(sw),WY(se) Fairbank RoundTop Amsden fossils:Marine invetebrates GEOLEX link NO cgkn link Hartville

Red House

? Pennsylvanian,Lower-Pennsylvanian,Middle limestone,shale,claystone NM Lake Valley/Percha/Cutter/Upham dolomite/Cable Canyon Nakaye fossils:Abundant marine invertebrates GEOLEX link NO cgkn link [Magdalena #Magdalena

Red Lion Formation

90m Cambrian,Upper shale,limestone MT(sw) Hasmark/Pilgrim Maywood Flathead/Wolsey fossils:Brachiopods,trilobites GEOLEX link NO cgkn link

Red Pine Shale

541m Proterozoic,Upper shale UT(n) Mutual Quartzite Tintic Quartzite Belt/Big Cottonwood fossils:Chuaria,vase shaped microfossils GEOLEX link NO cgkn link Ophir

Red Pass Limestone

Up to 107 meters of Middle Cambrian limestone, oolite, and calcaerous mudstone found in Death Valley and adjacent Nevada. It overlies the Pyramid Shale and is overlain by the Pahrump Hills Shale. It is a member of the Carrara Formation.

Fossils: Algal Remains

Red River

215m Ordovician,Upper limestone,dolomite MB,ND(w),SD(nw),SK,MT(se),WY(ne) Winnipeg,Deadwood Stony Mountain fossils:marine invertebrates GEOLEX link cgkn link Bighorn

Red Wall Limestone

Up to 400 meters of fossiliferous Mississippian limestone and dolomite found in Northern Arizona and adjacent New Mexico,Utah, and California. The Redwall overlies the Temple Butte Limestone/Muav Limestone/Cove Fort Quartzite/Pilot Shale/Ouray Limestone/Martin Formation. It is overlain by the Supai Formation/Oquirrh Formation/Callville Limestone. It has been subdivided into the Anchor, Arrowhead, Bullion, Dawn Dolomite. Horseshoe Mesa, Mooney Falls, Thunder Springs, Whitmore Wash, and Yellowpine members

Fossils: fairly abundant brachiopods and mollusks. Some ammonites, crinoids, bryozoa

Red Warrior Limestone

457m Silurian,Devonian limestone,dolomite,quartzite UT(wc) Morehouse Mowitza fossils:None GEOLEX link NO cgkn link obsolete

Redknife

88m Devonian,Upper limestones,dolomites,mudstones,shales AB,BC,NT Tathlina/Fort Simpson Kakisa fossils:abundant corals,barchiopods NO GEOLEX link cgkn link

Redonda

130m Triassic,Upper shale,sandstone,limestone NM(ec) Chinle-Bull Canyon Wingate fossils-vertebrates-Phytosaurs,Aetosaurs GEOLEX link NO cgkn link Chinle

Redstone River Formation

300m+ Proterozoic,Upper siltstone,mudstone,conglomerates,evaporites,limestones NT Little Dal Formation Coppercap Mountain fossils:None? NO GEOLEX link cgkn link MacKenzie Mtns Not to be confused with Redstone River Fm in Ontario

Reed Dolomite

Roughly 600 meters of Ediacaran dolomite including a Tongue (the Hines Tongue) of sandstone, dolomites and quartzites in some areas. It is found in the area of the Inyo,White,and Silverpeak ranges in California and Nevada. It overlies the Wyman Formation and is overlain by the Deep Spring Formation. It is part of a thick sequence of Middle Cambrian, Lower Cambrian and late Proterozoic outer shelf sediments with different nomeclature than the corresponding nearer shore sediments found further East.

Fossils: Ichnofossils, stromatolites

Reef Ridge

229 Miocene-Pliocene Shale,sandstone CA(wc) McLure Jacalitos fossils:marine invertebrates-forams,mollusks GEOLEX link NO cgkn link Not to be confuse with the Proterozoic Reef Ridge formation found in AZ

Reirdon

? Jurassic shale?,limestone? AB?,MT Sawtooth Swift fossils:marine invertebrates NO GEOLEX link NO cgkn link Ellis Group

Repetto

914m Pliocene siltstone,conglomerate,sandstone CA(sw) Monterey/Mint Canyon/Modelo Lomita/Pico/Saugus fossils:forams GEOLEX link NO cgkn link

Reston

61m Jurassic limestone,shale,(evaporites) MB(s) Lodgepole/Watrous Melita Gravelbourg/Piper fossils:? NO GEOLEX link cgkn link group Not to be confused with the Triassic Reston formation in MD and VA

Richfield

? Proterozoic,Middle-Upper slates,schists,conglomerates BC ? ? Isaac fossils:None? NO GEOLEX link cgkn link http://weblex.nrcan.gc.ca/html/012000/GSCC00053012751.html obsolete

Richland

1372m Pennsylvanian sandstone,clay,coal TX(c) Milburn Gordon fossils: GEOLEX link NO cgkn link Obsolete

Ricker

15-61m Pennsylvanian sandstone,conglomerate,clay TX(c) Indian Creek Canyon fossils:? GEOLEX link NO cgkn link Strawn

Rico

100m Pennsylvanian,Middle-Permian,Lower Sandstone,Shale,Limestone AZ(ne),CO(sw),NM(nw),UT(se) Hermosa Dolores fossils:fusulinids,branchiopods,arthropods GEOLEX link NO cgkn link

Ridge Route

1539m Miocene-Pliocene sandstone/shale/conglomerate CA(sw) Modelo Saugus fossils:non marine vertebrates? GEOLEX link NO cgkn link

Riepe Spring

188m Permian,Lower limestones NV(ec),UT(wc) Ely Riepetown Pakoon Limestone,Kirkman,Ferguson Mountain fossils:corals,fusulinids GEOLEX link NO cgkn link

Riepetown

307m Permian,Lower sandstone,limestone NV(ce),UT(cw) Riepe Spring Pequop fossils:fusulinids GEOLEX link NO cgkn link Arcturus,Carbon Ridge

Riley

244m Cambrian,Upper limestone,sandstone TX(c) Wilberns Cap Mountain Limestone/Hickory Sandstone/Lion Mountain Sandstone fossils:a few marine invertebrates GEOLEX link NO cgkn link Riley

Rio Mimbres Sandstone/Dolomite

? Ordovician,Upper sandstone,dolomite NM,TX ? ? fossils:? GEOLEX link http://ngmdb.usgs.gov/Geolex/NewUnits/unit_15713.html NO cgkn link Montoya

Risky Formation

167m Ediacaran? donomite,sandstone,shale NT,NU,YU Blueflower Ingta/Backbone Ranges fossils:stromatolites,ichnofossils NO GEOLEX link cgkn link http://weblex.nrcan.gc.ca/html/012000/GSCC00053012797.html

Road River - Ordovician-Lower Devonian shales and siltstone in ne BC. Graptolites-ichnofossils

2652m Ordovician,Lower-Devonian,Lower shale,limestone,siltstone,sandstone,chert AK(ec),BC,YU Cambrian/Ordovician limestones/Rabbitkettle Fort Creek/McCann Hill Chert/Canol/Michelle/Mt Kindle/Bonnet Plume fossils-graptolites,brachiopods,arthropods,gastropods,corals,ichnofossils GEOLEX link http://ngmdb.usgs.gov/Geolex/NewUnits/unit_11702.html cgkn link

Roberts Mountains Formation

600m Silurian,lower-Devonian,Lower limestone,slate,dolomite ID(c),NV(n) Hanson Creek Lone Mountain fossils:brachiopods,corals,graptolites,crinoid fragments,forams,tentaculids,trilobites,conodonts GEOLEX link NO cgkn link

Rochelle conglomerate

15m Pennsylvanian-Permian conglomerate,sandstone TX(c) Milburn cretaceous fossils: GEOLEX link http://ngmdb.usgs.gov/Geolex/Units/Rochelle_10204.html NO cgkn link Canyon

Rock Hill

1m Pennsylvanian,Upper limestone TX(nc) Graford Jasper Creek Chico Ridge fossils:marine invertebrates GEOLEX link NO cgkn link Canyon

Rock Point

245m TRiassic,Upper siltstone,sandstone AZ(ne)/NM(nw) Owl Rock Wingate Church Rock fossils:plants,wood,reptiles GEOLEX link NO cgkn link Chinle

Rockslide Formation

500m Cambrian,Middle Limestone,siltstone NT Sekwi Avalanche/Broken Skull/Sunblood fossils:None? NO GEOLEX link cgkn link

Rocky Mountain

488m Pennsylvanian-Permian quartzite,sandstone,dolomite AN(sw),MT(nw) Etherington Fernie fossils:none GEOLEX link| cgkn link

Rodeo

204m Miocene,middle shale,sandstone CA(wc) Hambre Briones fossils: GEOLEX link NO cgkn link Monterey

Rogers Spring Limestone

200m Mississippian,Lower limestone,chert NV(se),AZ(nw) Muddy Peak limestone Bluepoint limestone/[Callville#Callville] fossils:(sparse)corals,brachiopods GEOLEX link NO cgkn link

Ronning Group

? Cambrian,Upper-Silurian,Lower ? NT,YU ? ? Franklin Mountain/Mount Kindle fossils? NO GEOLEX link cgkn link Ronning Obsolete

Rooney Chert

176m Mississippian limestone,shale,chert MT(w) Dean Lake Monitor Mountain fossils:corals,brachiopods,fenestellid bryozoa GEOLEX link NO cgkn link Madison

Rosario

693m Cretaceous,Upper sandstone,conglomerate,siltstone CA(sw) metamorphis La Jolla fossils:marine invertebrates, vertebrates GEOLEX link NO cgkn link Rosario Cabrillo,Lusardi,Point Loma

Rosarito

310m Miocene sandstone,siltstone,mudstone,clay,basalt CA(sw) Eocene San Diego fossils: GEOLEX link NO cgkn link

Rosella Formation

850m Cambrian,Lower limestone,shale,siltstone BC(nc) Boya Kechika Mural fossils:trilobites NO GEOLEX link cgkn link http://weblex.nrcan.gc.ca/html/012000/GSCC00053012964.html Atan

Ross Canyon

? Permian? ? BC(se),AB(sw) ? Ranger Canyon #RangerCyn ? fossils:? NO GEOLEX link NO cgkn link

Ross Creek Formation

143m Permian,Lower limestones,siltstones,cherts BC Telford Ranger Canyon fossils:conodonts,often sparse macrofossils-brachiopods, corals, bryozoa and fusulinds NO GEOLEX link cgkn link http://weblex.nrcan.gc.ca/html/012000/GSCC00053012974.html

Ross Lake Shale

78m Cambrian,Middle shale,minor limestone AB(sw),BC(se) Lower Cathedral Upper Cathedral Snake Indian/Cathedral/Mount Whyte fossils:abundant marine invertebrates NO GEOLEX link cgkn link

Rough Creek

73m Pennsylvannian sandstone,clay TX Hanna Valley Buffalo Creek fossils: GEOLEX link NO cgkn link Strawn

Round Mountain Silt

67m Miocene,Middle siltstone,diatomite CA(c) Olcese Sand Santa Margarita/Mon Bluff/Kern River fossils:diatoms,forams,marine vertebrates GEOLEX link NO cgkn link Temblor

Round Valley Limestone

107m Pennsylvanian,Lower limestone CO(nw),UT(n),WY(sw) Manning Canyon Morgan/Hells Canyon fossils:marine invertebrates GEOLEX link NO cgkn link

Roundtop

45m Pennsylvanian,Middle shale,mudstone,limestone,dolomite NE,ND,SD(sw),WY(se) Reclamation/Fairbank Hayden/Hartville Cherokee fossils:marine invertebrates GEOLEX link NO cgkn link

Rundle Group

741m Mississippian,Middle-Mississippian,Upper limestones AB(s),BC,MT Banff Rocky Mountain/ [Fernie fossils:brachiopods,crinoids(fragments) GEOLEX link cgkn link

Ruth

152m Pennsylvanian limestone NV(e) Arcturus ? Ely fossils:marine invertebrates [GEOLEX link http://ngmdb.usgs.gov/Geolex/Units/Ruth_11729.html ] NO cgkn link

Sabine

214m Cambrian,Upper limestone,shale AB,BC Lyell Mistaya Bison Creek fossils:abundant trilobites NO GEOLEX link cgkn link

Sacajawea

27m Mississippian,Pennsylvanian Sandstone,Limestone,Breccia,Shale MT,ND,WY Madison Darwin Kibbey? fossils:marine invertebrates GEOLEX link NO cgkn link Minnelusa

Saddle Creek Limestone

4m Pennsylvanian,Upper limestone TX Waldrip Camp Creek fossils:? GEOLEX link cgkn link Pueblo

Sadler Ranch

124m Devonian-Lower-Devonian,Middle dolomite NV(ec) McColley Canyon Formation Oxyoke Canyon Sandstone fossils-crinoid fragments,conodonts GEOLEX link NO cgkn link

Sadlerochit

91m Permian,Early-Triassic,Early sandstone,quartzite,shale,limestone AK(n),YU Lisburne Shublik fossils:marine fossils-brachiopods GEOLEX link cgkn link Sadlerochit

Sagavanirktok

thick Cretaceous,Upper-Tertiary shale,sandstone(redbeds) AK(n) Prince Creek Gubik fossils:plants GEOLEX link NO cgkn link

Sage Formation

62m Cambrian,Upper Conglomerate,Shale,Limestone MT(sw),WY(nw) Snowy Range Maywood Gallatin fossils:algae,marine invertebrates-trilobites,brachiopods GEOLEX link NO cgkn link

Saline River

848m Middle Cambrian-Upper Cambrian shale,evaporites,halite NT Mount Cap Franklin Mountain fossils:stromatolites NO GEOLEX link cgkn link

Saline Valley Formation

500 meters of Lower Cambrian shale, limestone, siltstone and Quartzite found in the area of the Inyo,White,and Silverpeak ranges in California and Nevada. It overlies the Harkless Formation and is overlain by the Mule Spring Limestone. It is part of a thick sequence of Middle Cambrian, Lower Cambrian and late Proterozoic shelf sediments with different nomeclature than the corresponding nearer shore sediments found further East.

Fossils: Ollenelid trilobites, other trilobites

Salmon River

thick Cambrian,Upper-Mississippian,Upper shale,siltstone,limestone ID(c) Grand Prize Milligen Formation fossils:marine invertebrates GEOLEX link NO cgkn link

Salt Creek Bend

30m Permian,Lower clay,sandstone,limestone TX(c) Stockwether Camp Colorado fossils:? GEOLEX link NO cgkn link Pueblo

Salt Fork

305m Permian gypsum,clay,sandstone,salt KS,NE Wellington Dog Creek fossils: GEOLEX link NO cgkn link Cimarron

Salt Plain

47m Permian,Lower salt,shale,sandstone KS,OK Harper Cedar Hills fossils: GEOLEX link NO cgkn link Cimarron,Nippewalla

Samaria

182m Devonian,Middle-Devonian,Upper limestone,dolomite,sandstone UT Water Canyon Jefferson Devils Gate Limestone/Guilmette fossils:abundant invertebrates-bryozoans,gastropods,brachiopods,stromatoporoids GEOLEX link NO cgkn link

San Andreas Limestone

181m Permian,Early Limestone NM(c,se),TX(w) Yeso/Glorieta Goat Seep fossils:marine invertebrates GEOLEX link NO cgkn link | Manzano

San Angelo

69m Permian,Middle sandstone,shale,quartzite,conglomerate TX(cw) Clear Fork Whitehorse,Cloud Chief,Blaine,Cretaceous,Tertiary Blowout Mountain fossils: GEOLEX link NO cgkn link Pease River,El Reno

San Diego

152m Pliocene,Upper-Pleistocene sand,marl CA(w) Eocene San Pedro fossils:marine vertebrates, invertebrates GEOLEX link NO cgkn link

San Joaquin

571m Pliocene clay CA(wc) Etchegoin Tulare fossils: marine invertebrates-mollusks,echinoderms, vertebrates-shark teeth GEOLEX link NO cgkn link Etchegoin

San Pedro Sand

915m+ Pliocene-Pleiswtocene sand,silt,gravel,marl CA(sw) Saugus,San Diego,Santa Barbara Palos Verdes fossils:marine invertebrates-mollusks(well preserved) GEOLEX link NO cgkn link

San Juan

762m Oligocene tuff,conglomerate,mud,sand CO(sw) Telluride(San Miguel) volcanics fossils:None GEOLEX link NO cgkn link

San Lorenzo

? Eocene-Oligocene shale,mudstone CA(wc) ? Aromas fossils: marine invertebrates GEOLEX link NO cgkn link

San Pablo

457m Miocene,Upper sandstone/tuff/ash CA(wc) Monterey Santa Margarita fossils:mollusks,abundant echinods GEOLEX link NO cgkn link

San Rafael

76m Jurassic,Middle-Jurassic,Upper Conglomerate,Sandstone,Shale,Mudstone AZ,CO,NM,UT Navajo Sandstone/Redonda Morrison Formation fossils GEOLEX link [http://ngmdb.usgs.gov/Geolex/NewRefsmry/sumry_10460.html] NO cgkn link

Sandia Formation

1548m Pennsylvanian,Lower-Pennsylvanian-Upper Shale,Sandstone,Conglomerate,Limestone CO,NM Caloso Madera fossils:crinoids, bryozoa,brachiopods,worm borings,shark teeth GEOLEX link NO cgkn link

Sangre de Christo Formation

3962m Pennsylvanian,Middle-Permian,Lower limestone,conglomerate,shale CO(sc),NM(nc) Leadville Limestone Yeso fossils:a few plants,conodonts GEOLEX link NO cgkn link

Sanguine

170m Cambrian sand,mud,evaporites NT ? ? fossils: None? NO GEOLEX link cgkn link

Santa Barbara

? Pliocene-Pleistocene CA(sw) fossils: Geolex link NO cgkn link

Santa Monica

1524m+ Jurassic,Upper slate,graywacke CA(sw) metasediments? fossils:None GEOLEX link NO cgkn link

Santa Margarita

762 Miocene,Upper conglomerate,sandstone,shale CA(wc) Monterey Paso Robles/Cayuma fossils:marine invertebrates-oysters,Astrodaspis,Lyropecten,Croastrea GEOLEX link NO cgkn link

Santiago

? Eocene rocks CA(sw) | fossils: GEOLEX link NO cgkn link

Sapper

? Ordovician,Upper-Devonian,Middle limestones NT,YT Haywire Grizzly Bear/Funeral/Portrait Lake Whittaker/Delorme/Camsell/Road River/Sombre/Arnica fossils: graptolites,shelly fossils NO GEOLEX link cgkn link

Sappington Sandstone

73m Devonian,Upper-Mississippian sandstone ID-MT Three Forks Madison Bakken/Exshaw fossils: marine invertebrates GEOLEX link| NO cgkn link

Saskatchewan

350m Devonian limestone/dolomite/anhydrite/halite/mudstone MB(s)/MT(n)/ND/SD(nw)/SK(s) Manitoba Qu'Appelle/Three Forks Formation Nisku Formation fossils:marine invertebrates GEOLEX link cgkn link Saskatchewan

Sassenach Formation

224m Devonian,Upper rock_types AB(w) Mt Hawk/Southesk Palliser fossils: sparse marine invertebrates NO GEOLEX link cgkn link

Satanka Shale

71m Permian,Lower shale WY(sw),CO(nw) Casper Forelle fossils:? GEOLEX link NO cgkn link

Saturday Mountain

914m Ordovician,Middle-Silurian,Lower limestone,dolomite,(shale) ID(c) Kinnikinic Quartzite Trail Creek Phi Kappa,Fish Haven fossils:marine invertebrates(poorly preserved-arthropods(trilobites),brachiopods,bryozoa,corals,crinoids,graptolites GEOLEX link http://ngmdb.usgs.gov/Geolex/NewRefsmry/sumry_9981.html NO cgkn link

Saugus

610m Pliocene,Upper-Pleistocene,Lower sand/gravel/clay CA(sw) Mt Soledad/Pico recent fossils:molluscs,echinoderms,bryozoa GEOLEX link NO cgkn link Fernando

Sawatch Formation

61m Cambrian,Upper sandstone,quartzite,conglomerate CO(wc) Yule Limestone/Tomichi/Manitou/Dotsero/Peerless fossils: marine invertebrates-brachiopods GEOLEX link NO cgkn link Horseshoe Mountain Group

Sawtooth Formation

70m Jurassic,Middle Sandstone/Shale/Siltstone AB(sc),ID?,MT,ND? Hannan/Madison Reirdon Piper fossils:? GEOLEX link cgkn link Ellis Group

Saypo Limestone

40m Mississippian,Lower limestone MT(nw) Silvertip Dean Lake fossils:bryozoa(poor) GEOLEX link NO cgkn link Madison

Sayunei

500m+ Precambrian sandstone,siltstone,tillite NT,YT Coppercapb| Shezal fossils:None NO GEOLEX link cgkn link

Scherrer Formation

209m Permian,Lower limestone,siltstone,sandstone AZ(se),NM(sw) Colina Concha,Chiricahua Coconino fossils:uncommon,echinoid spines GEOLEX link NO cgkn link Naco

Schnebly Hill

274m Permian,Lower Sandstone,Siltstone,Mudstone,Evaporite,Carbonate AZ(nc) Hermit Coconino fossils:? GEOLEX link NO cgkn link

Schooler Creek

730m Triassic,Upper sandstone,rocks BC(ne) Toad Fernie/Bullhead ./MIDCONT.HTM#Bullhead/[Fort St John Group fossils:? NO GEOLEX link cgkn link Schooler Creek=Halfway,Charlie Lake,Baldonnel,Pardonet

Scott Peak

701m Mississippian,Upper limestone ID,MT(sw) Middle Canyon South Creek fossils:Bryozoa,Crinoids,Corals GEOLEX link NO cgkn link Madison

Scotty Wash Sandstone

305m Mississippian,Upper sandstone,quartzite,limestone NV(w) Peers Spring/Joana Limestone Bailey Spring/Bird Spring/Ely Diamond Peak/Chainman fossils:marine invertebrates- often sparse and poorly preserved GEOLEX link NO cgkn link Chainman

Scripps

67m Eocene-Middle sandstone,conglomerate| CA(sw) Ardath,Torrey Friars fossils:molluscs GEOLEX link NO cgkn link La Jolla

Second Value Dolomite

? Ordovician,Middle limestone?/dolomite? AZ,NM,TX Bat Cave/El Paso Limestone Jornada Formation? equivalent fossils:marine invertebrates(sometimes abundant?) GEOLEX link cgkn link Montoya

Sedgwick Peak

225m Cambrian,Lower quartzite ID(se) Windy Pass Twin Knobs fossils: marine-Scolithus,arthropoda-trilobita GEOLEX link NO cgkn link

Sedona Group

Permian redbeds Supai Group fossils:? NO GEOLEX link cgkn link Sedona

Sekwi

1370m Cambrian,Lower siltstone,limestone,dolostone NT,YT underlying Road River,Broken Skull,Rabbitkettle,Rockslide fossils:marine invertebraes-arthropoda-trilobita;archeocyathids, brachiopods-inarticulata;salterellids;ichnofossils(diverse) NO GEOLEX link cgkn link

Sentinel Mountain Dolomite

155m Devonian-Middle dolomite NV(ec) Oxyoke Canyon Woodpecker Nevada fossils:corals(small) GEOLEX link NO cgkn link

Sespe

2286m Eocene-Miocene sandstone,clay,conglomerate(redbeds) CA(sw) Vaqueros Tejon fossils:a few terrestrial vertebrates GEOLEX link NO cgkn link

Sevy Dolomite

244m Devonian,Lower-Devonian,Middle dolomite NV(e),NV(w) Laketown Dolomite Simonson Dolomite fossils:invertebrates-crinoids,gastropods(poorly preserved) GEOLEX link NO cgkn link

Shadscale

158m Cambrian,Middle Dolomite,Limestone,Siltstone,Shale UT(nw) Busby Quartzite Trailer Limestone Lyndon limestone,Chisholm shale,Eldorado dolomite fossils:trilobites,algae(poorly preserved) GEOLEX link NO cgkn link

Shaunavon

32m Jurassic,Middle limestone,(sandstone) SK Gravelbourg Melita Piper,Sawtooth fossils:(abundant)corals,pelecypods,gastropods,echinoids,Forams,algae NO GEOLEX link cgkn link

Sharon Creek

Early Paleozoic (Cambrian?-Devonian?) black silaceous siltstone and phyllite with minor limestone found in British Columbia(se). It overlies the Ajax Quartzite and is overlain by the Jowett Formation. It is a member of the Lardeau Group -- a sequence of unfossiliferous clastic sediments found in the Kootenay Terrane whose age is constrained by Lower Cambrian and Mississippian fossils in underlying and overlying beds.

Fossils: None

Sheepbed

1000m Proterozoic shale,(limestone),(siltstone) NT,YT Keele Backbone Ranges fossils:None? NO GEOLEX link cgkn link http://weblex.nrcan.gc.ca/html/013000/GSCC00053013636.html

Sheeprock Group

1220m Proterozoic,Upper Quartzite,Schist,Graywacke,Phyllite,Conglomerate UT(nc) Caddy Canyon fossils:None GEOLEX link NO cgkn link Sheeprock group

Sherven Formation

9m Silurian breccia,sandstone MT?,ND(nw) Missouri Breaks Formation Ashern fossils:None? GEOLEX link NO cgkn link Interlake subsurface

Shezal

500m Precambrian tillite,silt,shale,sandstonerocks NT Sayunei Twitya Rapitan fossils:None NO GEOLEX link cgkn link

Shinarump Conglomerate

15m Triassic,Upper conglomerate AZ(n),NV(se),NM(sc),UT(s) Moenkopi/DeChelly /Temple Butte Monitor Butte/San Pedro Arroyo Redonda fossils: petrified wood,plants,phytosaurs GEOLEX link NO cgkn link Chinle

Schrader Bluff

792m Cretaceous,Upper sandstone,shale,bentonite AK(ne) Chandler/Umiat Sagavanirktok fossils:mollusks,forams GEOLEX link NO cgkn link Colville

Shublik

411m Triassic,Middle-Upper limestone,shale,sandstone AK(n),YT Sadlerochit/Siksikpuk/Neruokpuk Kingak/Tiglukpuk fossils:marine invertebrates-conodonts,forams,ammonites,pelecypods GEOLEX link cgkn link

Shunda Formation

122m Mississippian,Lower limestone,dolomite,siltstone,sandstone,shale,breccias. Anhydrite,red beds AB(nw) Pekisko Turner Valley/Debolt Mission Canyon fossils:marine invertebrates/ NO GEOLEX link cgkn link

Sierrite Limestone

76m Ordovician,Lower limestone,chert NM(s) Bliss Bat Cave fossils:marine invertebrates(uncommon)-trilobites,inarticulate brachiopods GEOLEX link NO cgkn link El Paso

Siksikpuk Formation

108m Pennsylvanian-Triassic,Lower shale,siltstone AK(n) Lisburne Shublik fossils:Corals,brachiopods,gastropods GEOLEX link NO cgkn link Etivluk

Silver Hill

122m Cambrian,Middle rocks MT(sw) Flathead Hasmark Park shale/Meagher limestone/Wolsey shale/ fossils:trilobites(sparse) GEOLEX link NO cgkn link

Silverado

450m Paleocene conglomerate,sandstone,siltstone,clay CA(sw) cretaceous Santiago/Sespe fossils:plants,pollen GEOLEX link NO cgkn link

Silverhorn Dolomite

914+ Devonian,Middle dolomite,limestone NV(ec) West Range Formation fossils:marine invertebrates GEOLEX link NO cgkn link

Silvertip Conglomerate

43m Mississippian conglomerate,limestone MT(nw) Spotted Bear Saypo fossils:marine invertebrates GEOLEX link NO cgkn link Madison

Simi Conglomerate

457m Paleocene conglomerate,sandstone CA(sw) Chico Las Virgenes Las Virgenes fossils:None GEOLEX link NO cgkn link Martinez

Simonson Dolomite

305m Devonian,Lower-Devonian,Middle dolomite,conglomerate NV(e),UT(w) Sevy/McColley Canyon Formation Cove Fort/Guilmette fossils:marine invertebrates:stratoporoids(poorly preserved) GEOLEX link NO cgkn link

Simpson Group

610m Ordovician,Middle sandstone,limestone OK,TX Arbuckle Viola Harding fossils:marine invertebrates GEOLEX link NO cgkn link

Skajit Limestone

1220m Silurian?-Devonian limestone,schist AK(n) Endicott fossils:marine invertebrates(a few) GEOLEX link NO cgkn link Baird

Skeena

Cretaceous,Lower sandstone,volcanics BC Hazelton ? fossils:? NO GEOLEX link NO cgkn link Skeena

Skoki Limestone

550m Ordovician,Early-Ordovician,Middle limestone,dolomite,clastics AB(w) Tipperary Quartzite/Outram Owen Creek Glenogle fossils:Brachiopods,gastropods,conodonts,cephalopods,trilobites,echinoderms,corals NO GEOLEX link cgkn link

Slave Point Formation

120m Devonian,Middle limestone,dolomite,shale AB(n),BC(ne),NT(s) Fort Vermilion/Watt Mountain/Sulphur Point/[Presqu'ile #Presqu'ile] Beaverhill Lake/Waterways Livock River /Swan Hills fossils:brachiopods,stromatoporoids NO GEOLEX link cgkn link

Sly Gap

35m Devonian,Upper limestone,shale NM(sc) Montoya/Onate Lake Valley /Caballero fossils:brachiopods,crinoids,bryozoa,anthozoans,cephalopods,gastropods,fish GEOLEX link NO cgkn link

Smithwick

137m Pennsylvanian,Middle shale TX(c) Marble Falls Strawn fossils:marine invertebrates GEOLEX link NO cgkn link Bend

Smokey limestone

Cliff forming dolomite found in California and Nevada. It overlies the Halfpint Limestone and is overlain by the Pogonip Group. It is the upper member of the Nopah Formation.

Fossils: gastropods?

Snake Indian Formation

671m Cambrian,Middle shale,limestone,dolomite AB,BC Peyto/Hota Eldon/Titkana Mount Whyte/Cathedral/Stephen fossils:Trilobites NO GEOLEX link cgkn link

Snaky Canyon

1200m Mississippian,Upper-Permian,Lower Limestone,Sandstone,Dolomite ID Bluebird Mountain Phosphoria fossils:marine invertebrates-conodonts,brachiopods,fusulinids GEOLEX link NO cgkn link

Snowcrest Group

226m Mississippian,Upper-Pennsylvanian,Lower siltstones,sandstones,limestones ID(se),MT(sw) McKenzie Canyon Quadrant Formation Quadrant Formation fossils:marine invertebrates-brachiopods,corals GEOLEX link NO cgkn link Snowcrest

Snowy Range Limestone

94m Cambrian,Upper-Ordovician,Lower limestone WY(nw),MT(sw),ID(?) Maurice Formation Grove Creek fossils:trilobites GEOLEX link NO cgkn link Snowy Range

Snyder Hill Group

610m Permian limestone AZ(se) ? ? Colina Limestone/Scherrer Formation/Concha Limestone fossils:marine invertebrates GEOLEX link NO cgkn link

San Pedro Arroyo

23m Triassic,Upper Mudstone/Sandstone/Siltstone/Conglomerate NM(sc) Santa Rosa Morrison Formation/Dakota fossils:a few vertebrate fragments GEOLEX link cgkn link Chinle

Shingle Limestone

Lower Ordovician shale and limestone found in Western Utah. It is a member of the Pogonip group. It overlies the Parker Spring Formation and is overlain by the Kanosh Shale

Fossils: Conodonts, trilobites?, other megafossils?

Sombre

1101m Devonian,Lower-Devonian,Middle dolomites NT Camsell/Delorme Arnica Road River/Stone fossils:marine invertebrates(poorly preserved)-stromatoporoids,corals,amphipora NO GEOLEX link cgkn link

Souris River

94m Devonian,-Middle-Devonian,Upper siltstone/limestone/dolomite MB,MT(e),ND,SD,SK,WY(n) Dawson Bay/Beartooth Butte Duperow/Jefferson Maywood fossils:marine invertebrates GEOLEX link cgkn link

South Bend Shale

34m Pennsylvanian,Upper sandstone,shale TX(c) Bunger Gunsight Necessity Shale fossils:? GEOLEX link cgkn link Cisco

South Creek Limestone

122m Mississippian,Upper Limestone ID(sc),MT Scott Peak Surrett Canyon fossils(sparse):sponges,brachiopods,mollusks,forams,algae GEOLEX link NO cgkn link White Knob

South Hill Sandstone

61m Devonian,Lower-Devonian,Upper quartzite,sandstone NV(c) Grays Canyon Nevada/Sentinel Mountain/Bay State fossils:conodonts GEOLEX link NO cgkn link

Southesk formation

300m Devonian,Upper sandy limestones/dolomites AB(wc) Cairn/Borsato Sassenach/Alexo/Palliser/Crowfoot Leduc/Nisku fossils:marine invertebrates? NO GEOLEX link cgkn link Fairholme

Spearfish Formation

137m Permian,Upper-Triassic shale,sandstone,siltstone,gypsum,limestone MT(e),NE,ND(w),SD(w),WY(e) Minnekahta Sundance Chugwater,Watrous,Amaranth fossils: a few in very uncommon limestone beds? GEOLEX link cgkn link

Speck Mtn

9m Pennsylvanian,upper clay,limestone,shale,sandstone TX(c) Obregon Breckenridge fossils:fusilinids GEOLEX link NO cgkn link Thrifty/Cisco

Spence River Formation

55m Middle,Devonian-Upper,Devonian black shale AB,NT Slave Point/Beaverhill Lake Fort Simpson/Hay River Duvernay fossils:? NO GEOLEX link cgkn link

Spence Shale

10m Cambrian,Middle shale ID(se),UT(nw) Langston/Twin Knobs Ute/High Creek fossils:diverse marinve invertebrates GEOLEX link NO cgkn link

Spotted Bear Limestone

130m Devonian,Middle(?)-Devonian,Upper limestones MT(w) Lone Butte Silvertip fossils: diverse poorly preserved marine invertebrates GEOLEX link NO cgkn link Jefferson

Spring Creek

107m Pennsylvanian clay,sandstone TX(c) Brown Creek Cottonwood Creek fossils: GEOLEX link NO cgkn link Strawn

Springdale

70m Jurassic,Lower sandstones AZ(n),NV(ec),UT(sc) Petrified Forest Kayenta fossils:pollen,fish scales GEOLEX link cgkn link Moenave Not ot be confused with the Springdale Formation of NF

Spray River

853m Triassic,Early-Triassic-Middle Shale,Siltstone AB,BC,MT Ishbel Group,Fantasque,Rundle Fernie Schooler Creek,Diaber fossils:? GEOLEX link cgkn link

Starbird

270m Devonian,Upper dolomite BC Mount Forster/Horsethief Creek Formation Fairholme/Beaverhill Lake/Souris River fossils:corals,stromatoporoids,brachiopods,conodonts,echinoderms(debris),conodonts NO GEOLEX link cgkn link

Steamboat Limestone

198m Cambrian,Middle limestone/shale MT(nw) Pagoda Limestone/Pentagon Shale/Pentagon Shale Switchback Limestone Meagher fossils:trilobites(abundant),brachiopods GEOLEX link NO cgkn link

Steel

500m Silurian-Devonian,Lower mudstone,dolomite NT,YT Duo Lake Formation Portrait Lake fossils:graptolites NO GEOLEX link cgkn link

Step

610m Permian,Lower Conglomerate/Sandstone/Limestone AK(ec) Ford Lake Shale ? fossils:marine invertebrates? GEOLEX link NO cgkn link

Stephen Shale

370m Cambrian,Middle shale,limestone BC(ec)| Cathedral Eldon fossils:marine invertebrates NO GEOLEX link cgkn link

Stettler Formation

150m Devonian,Upper dolomites/evaporites AB(s)/MT(n)? Crowfoot Formation Big Valley Formation Torquay/Lyleton Formation fossils:biostromes NO GEOLEX link cgkn link

Stirling Quartzite

About 600 meters of somewhat metamorphosed Ediacaran impure sandstone found in the SouthWestern Great Basin and adjacent Mojave Desert. It overlies the Johnnie Formation and is overlain by the Wood Canyon Formation

Fossils: A few Ediacaran fossils as well as some ichnofossils are reported from the upper transitional beds to the Wood Canyon Formation

Stockwether Limestone

8m Permian,Lower limestone TX Coon Mountain/Saddle Creek Camp Colorado/Salt Creek Bend fossils:foram fragments GEOLEX link cgkn link Pueblo

Stoddart Group

660m Mississippian,Lower-Pennsylvanian,Lower limestone,shale,coal,evaporites AB(w)/BC(e) Debolt Belloy Formation Besa River Shale/Mattson/Mount Head Formation/Etherington Formation/Tunnel Mountain/Kananakis/Big Snowy Group fossils:marine invertebrates in some beds NO GEOLEX link cgkn link Stoddart

Stone Corral

thick Permian,Lower Dolomite,anhydrite,shale KS ? Nippewalla Fountain fossils: GEOLEX link NO cgkn link Sumner

Stone Limestone

600m Devonian,Lower-Devonian,Upper sandy dolomite BC(e) Wokkpash Dunedin Chinchaga fossils:? NO GEOLEX link cgkn link

Stonewall Formation

34m Silurian dolomite,anhydrite MB/MT/ND/SD/WY Stony Mountain Ashern Formation/Interlake Group/Fisher Branch dolomite fossils:marine invertebrates(sparse) GEOLEX link cgkn link

Stony Mountain Formation

Ordovician,Upper shale,limestone,dolomite MB/MT(ne)/SK/WY(ne) Red River Stonewall fossils:marine invertebrates(mostly in limestones) GEOLEX link cgkn link Bighorn

Souris Valley

170m Mississippian,Lower shale/limestone MB,ND,SK Bakken Tilston fossils:marine invertebrates GEOLEX link cgkn link

Stanaker

120m Triassic,Upper shale,siltstone,sandstone UT(ne) Woodside Nugget Ankareh/Chinle fossils:? GEOLEX link NO cgkn link

Strathearn

? Pennsylvanian,Upper-Permian,Lower ? NV(ce)-UT? | fossils:? GEOLEX link NO cgkn link

Storelk

93m Pennsylvanian, Lower sandstone BC(se) Tyrwhitt Tobermory fossils:a few brachiopods NO GEOLEX link cgkn link

Straight Canyon

113m Cambrian,Upper limestone,dolomite UT(nw) Lamb Dolomite Fera Hamburg Formation/Mendha Limestone/St Charles fossils:trilobites GEOLEX link NO cgkn link

Straight Cliffs

381m Cretaceous,Upper sandstone,coal UT(cs) Tropic Wahweap fossils:present(marine and non-marine(pollen,spores)) GEOLEX link NO cgkn link

Strathallen

261m Mississippian mudstones(calcaerous/bituminous) SK Bakken Kildeer fossils:marine invertebrates NO GEOLEX link cgkn link http://weblex.nrcan.gc.ca/html/014000/GSCC00053014638.html

Strathclair Formation

23m Silurian dolostome,mudstone MB,MT,ND(nw) Stonewall Formation Fife Lake Formation/Brandon fossils: GEOLEX link cgkn link Interlake

Strawn

914m Pennsylvanian clay,shale,limestone,conglomerate,coal NM(e),TX(nw) Richland/Gordon Shale Brownwood/Ranger fossils: GEOLEX link NO cgkn link

Stribling

41m Devonian,Lower-Devonian-Middle limestone,chert TX(c) Ellenburger Chappel fossils: GEOLEX link NO cgkn link

St Charles

373m Cambrian,Upper-Ordovician,Lower sandstone,limestone ID(ec),UT(ne) Nounan limestone Garden City fossils:marine invertebrates-trilobites,etc GEOLEX link NO cgkn link

St Piran Member

13m Cambrian,Lower sandstone,dolomite AB(wc) Lake Louise Peyto fossils:marine invertebrates(fragmented) NO GEOLEX link NO cgkn link Gog

Stoneberger Shale

It is overlain by the Ceasar Canyon Formation/Antelope Valley Formation. It is a member of the Pogonip group

Fossils: Trilobites, others?

Sullivan Formation

12m Cambrian,Upper siltstone,shale MO(s) Bonneterre Bonneterre fossils:marine invertebrates GEOLEX link cgkn link Bonneterre Not to be confused with the Sullivan formation in AB and BC

Sullivan Formation Canada

424m Cambrian,Upper shale,limestone AB(sw)/BC(se) Waterfowl Formation Lyell fossils:diverse trilobites NO GEOLEX link cgkn link Not to be confused with the Sullivan formation in OK

Sulphur Point

106m Devonian,Middle limestone,shale AB(nw)/BC(ne)/NT(s) Keg River/Pine Point/Muskeg Watt Mountain Shales Presquile fossils:stromatoporoids,corals,brachiopods,gastropods NO GEOLEX link cgkn link

Sultan Limestone

195m Devonian,Middle-Mississippian,Lower limestone/dolomite CA(se),NV,UT Goodsprings Monte Christo Formation fossils:corals,brachiopods,gastropods GEOLEX link NO cgkn link

Summerhouse Formation

306m Ordovician,Lower sandstone,shale,quartzite ID(ec) precambrian Kinnikinic Quartzite fossils: GEOLEX link NO cgkn link group

Sumner

259m Permian,Lower shale,gypsum,limestone,dolomite KS,NE,OK Chase Harper fossils: GEOLEX link | NO cgkn link | [Big Blue

Sunblood

1040m Ordovician,Middle limestones-dolostones NT,YT Broken Skull/Nonda Whittaker Formation Road River fossils:sparse marine invertebrates-trilobites,brachiopods,ostracodes,bryozoa,bivalves,cephalopods,conodonts NO GEOLEX link cgkn link http://weblex.nrcan.gc.ca/html/014000/GSCC00053014737.html

Sun Valley

3000m Pennsylvanian,Middle-Permian,Lower conglomerate,limestone,sandstone,siltstone ID(sc) Milligen Formation/Salmon River volcanics fossils: GEOLEX link NO cgkn link

Supai Sandstone

427m Mississippian,Upper-Permian,Lower shale,sandstone AZ(n),CA(se),NM,NV(s),UT(s) Redwall/[Naco Limestone Coconino/DeChelly/Hermit shale fossils:sparse marine invertebrates in some beds GEOLEX link NO cgkn link Supai

Surrett Canyon

244m Mississippian,Upper limestone ID(sc) South Creek Bluebird Mountain Big Snowy Formation/Lombard Limestone fossils:horn corals,echinoderms,brachiopods,gastropods,conodonts GEOLEX link NO cgkn link White Knob

Survey Peak

519m Cambrian,Lower-Ordovician,Lower shales,siltstones,limestones AB(sw),BC(se) Mistaya Outram McKay Formation/Chushina/Kechika fossils:trilobites,brachiopods,conodonts,gastropods,echinoderm debris,graptolites(uncommon) NO GEOLEX link cgkn link

Swan Hills

152m Devonian,Middle-Devonian,Upper limestones,dolomites AB Fort Vermilion,Elk Point Group Waterways Flume Limestone/Slave Point fossils:stromatoporoids,crinoids,brachiopods,gastropods,ostracods,algae NO GEOLEX link cgkn link

Swan River

150m Cretaceous,Lower sand,sandstone ND,MB paleozoic Ashville Mannville Group/Blairmore/Lakota Sandstone/Fuson Shale/Fall River fossils:plant fragments GEOLEX link cgkn link

Swan Peak Quartzite

152m Ordovician,Middle quartzite ID(se),UT Garden City Fish Haven/Crystal Peak Dolomite Lehman Formation fossils:brachiopods,graptolites,trilobites,bryozoa,ostracodes GEOLEX link NO cgkn link

Swasey Limestone

104m Cambrian,Middle limestone,shale UT(w),NV(e) Dome Limestone Wheeler Shale fossils:marine invertebrates-trilobites,brachiopods GEOLEX link NO cgkn link

Swift

47m Jurassic,Upper shale,sandstone AB,MB.MT(nc),SK Rierdon Formation Morrison Formation/Mannville Group Sundance fossils:marine invertebrate fragments,fish teeth GEOLEX link cgkn link

Switchback Limestone

76m Cambrian,Middle-Cambrian,Upper Limestone,dolomite,shale MT(nw) Gordon Mountain Limestone/Steamboat limestone Devils Glen Bloomington Formation fossils:marine inertebrates GEOLEX link NO cgkn link

Sycamore Limestone

49m Mississippian,middle limestone OK Woodford Shale Caney fossils: GEOLEX link NO cgkn link

Sylvan Shale

91m Ordovician,Upper shale KS/OK/TX Viola Hunton fossils:marine invertebrates Maquoketa GEOLEX link NO cgkn link

Tamarack Canyon Dolomite

Up to 300 meters of Upper Cambrian Dolomite found in the Inyo Mountains of California. It overlies the Lead Gulch Formation and is overlain by the Al Rose Formation

Fossils: None?

Tahkandit Limestone

409m Permian,Lower limestone,shale,conglomerate AK(ec)/YT Rampart GroupFormation/Nation River/Calico Bluff/Jungle Creek Mission Creek/Glen/Monster fossils:plants,marine invertebrates-brachiopods(abundant) GEOLEX link cgkn link

Talisman Quartzite

122m Permian,Lower quartzite UT(sw) Topache/Oquirrh Group Elephant Canyon/Toroweap Formation fossils:None GEOLEX link NO cgkn link

Taloga

120m Permian shale,siltstone,sandstone CO,KS,OK Day Creek Dockum Group Paint Rock fossils: GEOLEX link NO cgkn link Taloga

Tank Hill Limestone

Lower Ordovician limestone and conglomerate grading up into shale found in Eastern Nevada. It is a member of the Pogonip group. It overlies the Yellow Hill Limestone and is overlain by the Eureka Quartzite

Fossils: Reasonably abundant Lower Ordovician marine fossils in the lower part of the formation.

Tanyard

201m Ordovician,Lower limestone/dolomite TX(c) Wilberns Gorman Chepultepec fossils:locally abundant GEOLEX link NO cgkn link Ellenburger

Tapeats Sandstone

About 85 meters of Lower Cambrian Sandstone and Quartzite found in the Grand Canyon and adjacent areas of Arizona, California, Nevada, and Utah. It overlies various Proterozoic formations including the Chuar Group. The Tapeats underlies the Bright Angel Shale. Some authors have broken out a Chino Valley Formation from the Upper Tapeats in parts of Western Arizona. The Tapeats is equivalent to the Wood Canyon Formation to its West, and the Prospect Mountain Quartzite to its North. It's the lowest member of the Tonto Group

Fossils: Ichnofossils

Tatei-Chetang

397m+ Cambrian,Middle limestone/dolomite/siltstone/shale AB/BC Hota Titkana Formation fossils:? NO GEOLEX link cgkn link http://weblex.nrcan.gc.ca/html/014000/GSCC00053014956.html,

Tathlina

134m Devonian,Upper limestone,shales,siltstones AB/NT Twin Falls Formation Fort Simpson Formation fossils:marine invertebrates NO GEOLEX link cgkn link

Tatow Limestone

50m Cambrian,Middle limestone,sandstone UT(sw) Pioche Shale Howell Limestone fossils:trilobites,brachiopods GEOLEX link cgkn link

Taylorton Formation

76m Silurian,Upper dolomite ND/SK Cedar Lake Formation Ashern Formation Interlake Group fossils:? NO GEOLEX link cgkn link

Tecovas

61m Triassic,Upper shale TX(n) Quartermaster Trujillo fossils:petrified wood,ostracods GEOLEX link NO cgkn link Dockum Group

Tecuya

716m Eocene-Miocene sandstones/shales/tuff/lava/conglomerate CA(sw) Tejon Temblor fossils:vertebrates,mollusks,forams GEOLEX link NO cgkn link

Tegart Formation

74m Silurian,Lower limestones,shales AB(sw)/BC(se) Beaverfoot Cedared Formation fossils:Trilobites,brachiopods,graptolites,corals,cephalopods,conodonts NO GEOLEX link cgkn link

Tejon

1646m Eocene shales,sandstone,conglomerate CA(w) Martinez Sespe/Tecuya fossils:marine invertebrates GEOLEX link NO cgkn link

Temple Butte Limestone

Up to 120 meters of Devonian channel fill limestone exposed intermittently the Grand Canyon and the canyon of the Little Colorado River. It overlies the Muav Formation and is overlain by the Redwall Limestone

Fossils: occasional well preserved fish

Telegraph Canyon

610m Devonian,Middle dolomite,limestone NV(c) Union Mountain Limestone Devils Gate Limestone Sentinel Mountain Dolomite fossils:marine invertebrates GEOLEX link NO cgkn link

Telford

259m Permian Limestones BC(se) Johnston Canyon Ross Creek Ishbel fossils:conodonts,brachiopods,corals,bryozoa NO GEOLEX link cgkn link

Telluride Formation

305m Eocene,Lower conglomerate CO(sw) Cimmeron Ridge San Juan fossils:None? GEOLEX link NO cgkn link

Tendoy Group

305m Mississippian limestones,chert MT(sw) Three Forks Formation/Madison Group Kibbey sandstone/Big Snowy fossils:conodonts,corals GEOLEX link NO cgkn link

Tensleep

122m+ Pennsylvanian,Middle-Permian,Lower sandstone WY(w) Amsden Chugwater/Phosphoria Minnelusa fossils:a few fusulinids GEOLEX link NO cgkn link

Temblor Formation

? Miocene sandstone,siltstone,shale CA(sc) Vaqueros fossils:marine vertebrates/invertebrates GEOLEX link NO cgkn link

Temple Mountain

10m Triassic,Upper rocks UT(ec) Moenkopi Moss Back/Monitor Butte fossils:plant fragments GEOLEX link cgkn link Chinle

Tetcho formation

75m Devonian,Upper limestone,shale BC,NT Trout River/Fort Simpson Kotcho formation Wabamun Formation,Besa River Shale fossils:brachiopods NO GEOLEX link cgkn link

Teutonic Limestone

173m Cambrian,Middle limestone UT(c) Ophir Formation Dagmar Limestone fossils:maybe a few marine invertebrates GEOLEX link cgkn link

Thaynes

792 Triassic,Lower limestone/sandstone/shale ID(se),MT(sw),NV(ne),UT(n),WY(w)* Woodside/Dinwoody Nugget/Ankareh fossils:brachiopods,ammonites(abundant) GEOLEX link cgkn link

Thimble Limestone

About 50 meters of fossiliferous black,brown,orange Lower Cambrian Limestone found in Death Valley and adjacent Nevada. The Thimble overlies the Eagle Mountain Shale and is overlain by the Echo Shale. It is a member of the Carrara Formation.

Fossils: Trilobites

Thor Hills

440m Devonian,Upper shales,limestones YT Misfortune Tsichu fossils:None NO GEOLEX link cgkn link

Three Forks Shale

93m Devonian,Upper-Mississippian? shale,limestone,sandstone ID,MT,ND,SD,SK,UT,WY Jefferson/Dry Creek shale/Saskatchewan Madison Group/Sappington Formation/Bakken/Big Valley Formation Wabamun Formation/Exshaw Formation fossils:marine invertebrates GEOLEX link cgkn link

Thrifty

152m Pennsylvanian,Upper limestone,shale,sandstone TX Graham Harpersville fossils:marine invertebrates GEOLEX link NO cgkn link Cisco

Thunder Springs Limestone

71m Mississippian,Lower dolomite,chert,limestone AZ(nc)/UT(sc) Whitmore Wash Mooney Falls Redwall Limestone fossils:marine invertebrates GEOLEX link NO cgkn link Redwall Limestone

Thursday Dolomite

100m Silurian,Middle rocks UT(nw) Lost Sheep Dolomite Sevy dolomite fossils:(sparse)corals,stromatoporoids GEOLEX link NO cgkn link

Tick Canyon

thick Miocene,Early-Miocene,Middle ? CA(sw) Mint Canyon ? fossils:mammals? GEOLEX link NO cgkn link

Tilston

80m Mississippian,Lower anhydrite/limestone MB,MT,SD,SK Souris Valley Frobisher-Alida fossils:None GEOLEX link cgkn link

Timothy

400m Triassic,Lower sandstone,shale ID,UT,WY Thaynes Higham grit fossils:plants GEOLEX link NO cgkn link

Timms Point

37m Pleistocene sand,silt CA(sw) Lomita San Pedro fossils:marine vertebrates,invertebrates GEOLEX link NO cgkn link

Tin Mountain Limestone

305m Mississippian,Lower limestone CA(ec) Lost Burro Formation fossils:corals(diverse),gastropods,trilobites,ostracodes,brachiopods,crinoids,bryozoans,goniatitic ammonoids GEOLEX link cgkn link

Tincanebits

6m Cambrian,Middle dolomite AZ(nw) Muav fossils:none GEOLEX link cgkn link

Tindir Group

1524m+ Proterozoic-Cambrian,Lower Dolomite/Quartzite/Shale/Sandstone AK(ec),YU Yukon fossils:protists,etc GEOLEX link cgkn link

Tiglukpuk Formation

610m Jurassic,Upper Conglomerate/Graywacke/Sandstone/Tuff AK(n) Shublik Fortress Mountain fossils:bivalves GEOLEX link NO cgkn link obsolete

Tintic Formation

91m Cambrian,Lower-Cambrian,Middle quartzite UT(c) Ophir Formation Brigham Quartzite fossils:None GEOLEX link NO cgkn link

Tipperary Quartzite

Ordovician,Middle quartzite AB,BC fossils:None? NO GEOLEX link cgkn link group

Titkana Formation

519m Cambrian,Middle limestones AB,BC Tatei-Chetang Arctomys/Pika Formation Eldon Formation fossils:sparse NO GEOLEX link cgkn link

Tobermory Formation

102m Pennsylvanian,Middle sandstone BC Storelk/Etherington Formation Kananakis fossils:A few marine invertebrates NO GEOLEX link cgkn link

Todhunter Formation

35m Mississippian siltstone,dolomite,sandstone AB/BC Etherington Formation Misty Amsden fossils:marine invertebrates NO GEOLEX link cgkn link group

Todilto Limestone

91m Jurassic,Middle sandstone,shale,limestone,chert,conglomerate,evaporates AZ(ne),CO(sw),NM(nw),UT(se) Wingate/Entrada/Wanakah Navajo/Morrison Formation Sundance? fossils:bivalves,ostracods,fish,reptile tracks GEOLEX link NO cgkn link San Rafael

Tomichi Limestone

183m Ordovician,Middle limestone,chert,sandstone,shale CO Sawatch Sandstone Ouray Formation/Chaffee Formation fossils:corals,cephalopods,crinoids,sponges,fish fragments,brachiopods, etc GEOLEX link NO cgkn link (obsolete?)

Tonto Group

About 430 meters of Cambrian Sandstone,Shale,Quartzite,and Dolomite found in the Grand Canyon and adjacent areas of Arizona, California, Nevada, and Utah. It overlies various Proterozoic formations including the Chuar Group and is overlain by Devonian and Mississippian beds -- Elbert Formation/Temple Butte Formation/Muav Limestone. The Group includes the Tapeats Sandstone/Bright Angel Shale/Muav Limestone.

Fossils: Ichnofossils, a few trilobites

Tony Grove Lake

190m Silurian,Lower dolomite NV,UT Fish Haven/Ely Springs Dolomite Laketown Dolomite fossils:brachiopods GEOLEX link NO cgkn link

Topache Limestone

457m Mississippian limestone,shale UT(c) Mowitza Talisman Quartzite fossils:brachiopods,crinoids,corals GEOLEX link NO gkn link obsolete

Topanga

1829m Miocene,Middle sandstone CA(sw) Vaqueros/Meganos/volcanics /Puente fossils:marine invertebrates GEOLEX link NO cgkn link Topanga

Topagoruk

777 Cretaceous,Lower shale,siltstone,sandstone AK Torok Nanushuk fossils:marine invertebrates? GEOLEX link NO cgkn link

Topliff

141m Mississippian,Upper limestones UT(c) Humbug Formation Great Blue Limestone fossils:? GEOLEX link cgkn link Great Blue Limestone

Tor Limestone

150m Devonian,Lower limestone NV(c) Antelope Valley Limestone fossils:brachiopods GEOLEX link NO cgkn link

Torok

1829m Cretaceous silt,shale,sandstone,conglomerate AK(nw) Fortress Mountain/Okpikruak Formation Nanushuk/Tuktu fossils:marine invertebrates?,forams GEOLEX link NO cgkn link

Toroweap Formation

129m Permian,lower limestone,sandstone,shale AZ,CA,NV,UT Coconino Kaibab fossils:echinoids,crinoids,bryozoans,brachiopods,pelecypods,scaphopods,gastropods,crustaceans,fish remains GEOLEX link NO cgkn link

Torqua/Torquay Formation

50m Devonian,Upper dolomite/shale/anhydrate MT,ND,SK Birdbear Formation Big Valley Formation/Bakken Shale Crowfoot Formation fossils:None? GEOLEX link cgkn link Three Forks Formation

Torrey

61m Eocene,Middle sand CA(sw) Delmar Sand Ardath fossils:poorly preserved marine invertebrates GEOLEX link NO cgkn link La Jolla

Towsley

1219m Miocene,Upper-Pliocene,Lower sandstones/mudstones/conglomerates CA(sw) Modelo Pico fossils:forams,invertebrates GEOLEX link NO cgkn link

Trabuco

91m+ Cretaceous,Lower conglomerate,sandstone CA(sw) metasediments Ladd/Chico fossils:None GEOLEX link cgkn link

Trail Creek Formation

152m Silurian quartzite,sandstone ID Phi Kappa Milligen Formation fossils:graptolites GEOLEX link NO cgkn link

Trailer Limestone

117m Cambrian,Middle limestones UT(wc) Shadscale Formation Fandangle fossils:worm tubes,algae GEOLEX link NO cgkn link

Tripon Pass Limestone

472m Mississippian,Lower limestones NV,UT Guilmette Formation Diamond Peak Formation fossils:crinoid fragments,stomatolites GEOLEX link NO cgkn link

Trippe Limestone

221m Cambrian,Middle limestone,dolomite UT Young Peak Lamb Dolomite fossils:None GEOLEX link NO cgkn link

Triune

Up to 305 meters of Cambrian? through Devonian? black slates and phyllite found in British Columbia(se). It overlies the Index Formation and is overlain by the Ajax Formation. It is a member of the Lardeau Group -- a sequence of unfossiliferous clastic sediments found in the Kootenay Terrane whose age is constrained by Lower Cambrian and Mississippian fossils in underlying and overlying beds.

Fossils: Unknown

Tropic

183m Cretaceous,Upper shale,sandstone UT(cs) |Dakota Straight Cliffs fossils:marine invertebrates-oysters,ammonites GEOLEX link NO cgkn link

Trout River

52m Devonian,Upper Limestone,shale BC/NT Grumbler/Fort Simpson/Kakisa Tetcho fossils:brachiopods,corals NO GEOLEX link cgkn link

Troy Quartzite

30m Cambrian,Middle? sandstone,quartzite AZ Apache Group Martin Limestone Abrigo Limestone fossils:ichnofossils? GEOLEX link NO cgkn link

Trujillo

64m Triassic,Upper sandstone,shale,conglomerate NM(ne),TX(nw) Tecovas,Garita Creek Chinle,Bull Canyon,Tertiary Chinle fossils:present GEOLEX link NO cgkn link Dockum Group

Tsichu

thick Mississippian,Lower-Pennsylvanian,Lower quartzite,shale,limestones NT/YT Earn Group ? fossils:? NO GEOLEX link cgkn link Tsichu

Tuna Canyon

800m Cretaceous-upper sandstone CA(sw) Santa Monica Coal Canyon,Simi fossils:? GEOLEX link NO cgkn link

Tunnel Mountain

610m Pennsylvanian,Upper sandstone,dolomite Alberta(wc) Etherington Formation Kananakis/Ishbel Group fossils:a few brachiopods and forams NO GEOLEX link cgkn link

Tupik

213m Mississippian,Upper-Pennsylvanian,Lower limestone AK(n) Kogruk Formation Siksikpuk Formation fossils:sparse GEOLEX link NO cgkn link Lisburne

Tuktu

305m Cretaceous,Lower sandstone AK(n) Torok Chandler/Umiat Nanushuk fossils:abundant GEOLEX link NO cgkn link Nanushuk

Tulare

945m Pliocene,Pleistocene sand CA(c) Etchegoin fossils:fresh water mollusks,ostracods,fish,diatoms GEOLEX link NO cgkn link

Turner Valley

110m Mississipean,Lower limestone,dolomite AB(wc) Shunda Formation Mount Head Formation Mission Canyon Formation/Debolt fossils: NO GEOLEX link cgkn link

Twin Creek

869m Jurassic,Middle shale,limestone BC,ID,UT,WY Nugget Beckwith,Pruess fossils:sparse marine invertebrates GEOLEX link NO cgkn link group

Twin Falls

200m Devonian,Upper limestone,shale NT Hay River Formation Tathlina Fort Simpson Formation,Ireton Formation/Grosmont Formation fossils:corals, brachiopods NO GEOLEX link cgkn link

Twin Knobs

180m Cambrian,Middle sandstone-limestone ID/UT Sedgwick Peak Quartzite Brigham Quartzite fossils:Girvanella GEOLEX link NO cgkn link group

Twitya

700m Precambrian limestone,shale,sandstone NT,YT Shezal Keele fossils:None? NO GEOLEX link cgkn link

Tyler

122m Mississippian,Upper-Pennsylvanian,Lower sandstone,shale MT,ND Heath/Otter Alaska Bench Limestone Conover Ranch fossils:present http://ngmdb.usgs.gov/Geolex/Units/Tyler_10698.html GEOLEX link NO cgkn link Amsden Group

Tyrwhitt

105m Pennsylvanian,Lower sandstone AB(sw),BC(se) Etherington Formation fossils:brachiopods NO GEOLEX link cgkn link

Uinta Group

1234m Eocene marlstone,sandstone,siltstone CO(wc),UT(ec) Green River fossils: GEOLEX link NO cgkn link

Uinta Mountain

7000m Proterozoic,Upper Quartzite,shale UT(ne),CO(nw) Tintic Formation Ophir Formation fossils:Chuaria,microfossils GEOLEX link [http://ngmdb.usgs.gov/Geolex/Units/UintaMountain_10705.html] NO cgkn link

Umiat

1524m Cretaceous sandstone,shale AK(n) Torok Schrader Bluff Topagoruk fossils:marine invertebrates(uncommon),forams GEOLEX link NO cgkn link obsolete

Uncompahgre

2438m Proterozoic quartzites,shales CO(sw) Ignacio Quartzite fossils:none GEOLEX link NO cgkn link

Union Mountain Limestone

366m Devonian-Lower,Middle dolomite,sandstone NV McColley Canyon Formation Telegraph Canyon Sadler Ranch Formation/Oxyoke Canyon Sandstone/Beacon Peak Dolomite fossils:marine invertebrates GEOLEX link NO cgkn link Obsolete

Upham Dolomite

17m Ordovician,Upper dolomite AZ(?),NM(sc),TX Cable Canyon formation Aleman Formation fossils:marine invertebrates(sparse) GEOLEX link NO cgkn link Montoya Group

Ute Limestone

230m+ Cambrian,Middle limestone UT,ID Langdon Quartzite Blacksmith Limestone fossils:marine invertebrates(abundant) GEOLEX link NO cgkn link

Utukok Formation

911m Mississippian limestone,sandstone AK(nw) Kogruk Formation fossils:marine invertebrates-brachiopods,bryozoans,blastoids,corals,and crinoids GEOLEX link http://ngmdb.usgs.gov/Geolex/Units/Utukok_12188.html NO cgkn link Lisburne Group

Vale

104m Permian,Lower rocks TX Arroyo Choza fossils: GEOLEX link NO cgkn link Clear Fork

Vangard

180m Jurassic,Middle-Jurassic,Upper shale,sandstone SK(sw) Shaunavon Mannville Group fossils:bivalves,ammonites NO GEOLEX link cgkn link

Vaughn Gulch Limestone

Up to 450 meters of dark, silty Silurian and possibly Lower Devonian bioclastic limestone found in the Mazourka Canyon area of the Inyo Mountains of California. It overlies the Ely Springs Dolomite and is overlain by the Perdido Formation.

Fossils: corals, sponges, bryozoans and pelmatozoans - often fragmentary

Vampire

600m? Triassic-Jurassic conglomerate,sandstone,quartzive,volcanics AZ(wc) Buckskin volcanics fossils:None GEOLEX link NO cgkn link

VampireNT

930m Precambrian-Cambrian,Lower siltstone,quartzite NT(w) Backbone Ranges Sekwi equivalent fossils:ichnofossils NO GEOLEX link cgkn link

Van Horn Sandstone

152m Cambrian? sandstone,conglomerate TX(w) Millican El Paso Limestone fossils:none GEOLEX link NO cgkn link

Vaqueros

762m Oligocene,Upper-Miocene sandstone CA(wc) San Lorenzo/Kreyenhagen Santa Margarita/Monterey/Topanga Sespe fossils:marine invertebrates-mollusks GEOLEX link NO cgkn link

Vedder

thick Oligocene sand,silt,sandstone CA(c) Jewett fossils:mollusks GEOLEX link NO cgkn link

Ventioner

91m Pennsylvanian,Upper sandstone,shale,limestone TX(nc) Devils Den Ranger fossils:sparse marine invertebrates,plant debris GEOLEX link NO cgkn link Brad

Victoria Quartzite

85m Devonian,Upper limestone,quartzite UT(c) Bluebell Gardner Limestone fossils:None GEOLEX link NO cgkn link

Vinini

thick Ordovician quartzite,sandstone,shale NV(nc) Eureka Quartzite/Hanson Creek/Pogonip Group ? fossils:graptolites GEOLEX link NO cgkn link

Viola

61m Ordovician,Upper limestone,chert OK Simpson Misener fossils:marine invertebrates GEOLEX link NO cgkn link

Wabamun Formation

270m Devonian,Upper dolomite,limestone,anhydrite AB Graminia Formation Exshaw Formation/Blairmore Palliser formation fossils: NO GEOLEX link cgkn link

Wachsmuth Limestone

375m Mississippian,Lower limestone,dolomite AK Alapah Kayak Shale fossils:marine invertebrates-brachiopods,blastoids,corals,crinoids,bryozoans GEOLEX link NO cgkn link Lisburne Group

Wah Wah Limestone

75 meters of silty Ordovician limestone found in Utah and adjacent Nevada. It overlies the Fillmore Limestone and is overlain by the Juab Limestone. It is a member of the Pogonig Group

Fossils: abundant brachiopods and gastropods

Wah Wah Summit

356m Cambrian,Upper limestone,dolomite UT(wc) Trippe Limestone Orr Formation Lamb Dolomite/Deep Creek/Fish Springs/Weeks fossils:? GEOLEX link NO cgkn link

Wahweap

381m Cretaceous,Upper sandstone UT(sc) Straight Cliffs Kaiparowits Mancos fossils:vertebrate fragments GEOLEX link NO cgkn link

Wahoo Limestone

417m Mississippian,Upper-Pennsylvanian,Middle limestone AK(n),YT(n) Alapah Siksikpuk Formation/Sadlerochit fossils:marine invertebrate-forams,corals GEOLEX link cgkn link| Lisburne

Wahsatch Limestone

2438m Ordovician-Mississippian,Lower limestone NV,UT(ne) Swan Peak Sandstone | fossils:marine invertebrates GEOLEX link NO cgkn link

Waldrip

61m Pennsylvanian,Upper shale,clay,limestone,coal TX(c) Breckenridge Pueblo fossils:marine invertebrates-crinoids GEOLEX link http://ngmdb.usgs.gov/Geolex/Units/Waldrip_11031.html NO cgkn link Cisco

Walker

610m Oligocene sandstone,conglomerate,shale CA(sc) granites Vedder/Jewett fossils:None? GEOLEX link NO cgkn link

Wanakah

46m Jurassic.middle marl,sandstone AZ,CO,NM,UT Entrada Morrison Formation fossils: GEOLEX link NO cgkn link San Rafael Not to be confused with Devonian Wanakah Shale of NY

Wapanucka Limestone

61m Pennsylvanian,Lower-Pennsylvanian-Middle limestone OK(se) Caney Atoka fossils:sponges,corals,brachiopods,foraminifera,ostracods GEOLEX link NO cgkn link

Warneford

? Devonian-Mississippian sandstone? BC(ne) Akie Anvil Range Group fossils: NO GEOLEX link cgkn link Earn

Waskada

58m Jurassic,Upper shale,sandstone/ironstone MB(sw) Melita Swan River/Ashville Vangard/Swift fossils:? NO GEOLEX link cgkn link

Watahomigi

66m Mississippian,Upper-Pennsylvanian,middle limestone,sandstone,siltstone,conglomerate AZ(nw) Redwall Limestone Manakacha fossils:conodonts GEOLEX link NO cgkn link Supai

Water Canyon

168m Devonian,Lower dolomite,shale,conglomerate(redbeds),limestone UT(ne),ID(se) Laketown Dolomite Jefferson fossils:marine invertebrates GEOLEX link NO cgkn link

Waterfowl

183m Cambrian,Middle-Cambrian,Upper limestone,dolomite,sandstone AB(sw) Arctomys Sullivan Formation fossils:trilobite fragments NO GEOLEX link cgkn link

Waterways

230m Devonian,Middle-Devonian-Upper shales,limestones AB(n) Livock River Cooking Lake Formation Beaverhill Lake/Hay River Formation/Horn River Formation/Flume/Souris River fossils:(sometimes abundant) corals,brachiopods,ostracods NO GEOLEX link cgkn link

Watrous

110m Triassic-Jurassic shale,mudstone,anhydrite ND,SK(sc) Gravelbourg/Reston Amaranth fossils:None NO GEOLEX link cgkn link

Watt Mountain Shale

74m Devonian,Middle sandstone,limestone,shale,dolomite,anhydrite AB,BC(ne),NT(s) Muskeg Formation,Sulphur Point Slave Point Formation fossils: NO GEOLEX link cgkn link

Watson Ranch Quartzite

Up to 100 meters of Ordovician quartzite found in Western Utah. It overlies the Lehman formation/Deadman Spring Dolomite and is overlain by the Crystal Peak Dolomite/Eureka Quartzite.

Fossils: ichnofossils. body fossils reported from some beds

Watts Creek

23m Permian,Lower clay,limestone,sandstone TX(c) Camp Colorado Horse Creek fossils: GEOLEX link NO cgkn link Moran/Cisco

Wayland Shale

30m Pennsylvanian,Upper shale TX(sc) Gunsight Avis fossils:abundant foraminifers,corals,crinoids,echinoids,bryozoans,brachiopods,gastropods,cephalopods,pelecypods,fish teeth/spines GEOLEX link cgkn link Cisco

Weber

457m Pennsylvanian,Middle-Permian,Lower sandstones,quartzite,shale CO,UT,WY Wasatch/Morgan Formation Park City Formation Maroon Formation fossils:None? GEOLEX link NO cgkn link

Weeks Limestone

424m Cambrian,Middle-Cambrian-Upper limestone/shale UT(wc) Marjum Orr Formation fossils:trilobites,brachiopods GEOLEX link NO cgkn link

Wellington

137m Permian,Lower shale,limestone,gypsum KS Geuda Harper fossils: GEOLEX link NO cgkn link Sumner

Wells

610m+ Mississippian,Upper-Permian,Lower sandstone,limestone ID(se)/MT(sw)/UT(ne)/WY(nw) Brazer Limestone/Milligen Formation Phosphoria/Park City Formation fossils:brachiopods, corals, mollusks GEOLEX link NO cgkn link

Wendover

40m Pennsylvanian,Upper limestone,chert,shale,mudstone NE,SD,WY Meek Formation Broom Creek Formation fossils: GEOLEX link NO cgkn link

Wescogame Sandstone

61m Pennsylvanian,Upper sandstone/limestone/mudstone AZ(nw) Manakacha Esplanade Sandstone fossils:fusilinids GEOLEX link NO cgkn link Supai

West Canyon

444m Pennsylvanian,Lower limestone,sandstone,chert ID/UT Manning Canyon Shale Butterfield Peaks Formation fossils:brachiopods,crinoids,bryozoans,algae,fusulinids,corals GEOLEX link NO cgkn link Oquirrh Group

West Range Limestone

90m Devonian,upper limestone NV(e) Silverhorn Pilot Shale fossils:marine invertebrates (abundant) GEOLEX link NO cgkn link

Wheeler

107m Cambrian,middle shale,limestone UT(wc) Marjum,Dome Limestone Swasey Formation fossils:marine invertebrates-Trilobites(abundant) GEOLEX link NO cgkn link

Whetstone Creek

9m Cambrian,upper limestone,sandstone,shale AR,OK,MO Sullivan Formation Davis,Elkins fossils:marine invertebrate fragments GEOLEX link NO cgkn link Bonneterre

Whirlwind

36m Cambrian,Middle limestone,shale NV(ec),UT(wc) Dome Limestone Swasey Formation,Highland Peak Limestone fossils:trilobites GEOLEX link NO cgkn link

White Knob

3048m+? Mississippian,Lower-Permian limestones ID,MT Milligen Formation ? fossils:marine invertebrates GEOLEX link NO cgkn link

White Pine Shale

716m Pennsylvanian,Middle limestones,shale UT(nc) Maple Butterfield Formation Butterfield Peaks fossils:fusulinids,brachiopods,bryozoa GEOLEX link NO cgkn link Oquirrh Group abandoned

White Ridge Limestone

46m Devonian,Upper limestone,sandstone MT(nw) Devils Glen Glenn Creek Shale fossils:? GEOLEX link NO cgkn link Jefferson

Whitehorse

94m Permian,Middle sandstone,shale,gypsum KS,OK,TX Dog Creek Day Creek fossils: GEOLEX link NO cgkn link Woodward Not to be confused with the Triassic Whitehorse Formation in AB and BC

Whitewood Limestone

24m Ordovician,Upper limestone,dolomite,shale MB?,MT,SD(w),WY(e) Deadwood Formation Englewood Formation fossils:marine invertebrates(large)ammonoids (ENDOCERAS),mollusks,corals GEOLEX link cgkn link

Whitmore Wash Limestone

26m Mississippian,Lower limestone,dolomite AZ(nc),UT(sc) Temple Butte Formation Thunder Springs Limestone fossils: GEOLEX link NO cgkn link Redwall Limestone

Whittaker

457m Ordovician,Upper-Silurian limestone,dolomite,shale NT Sunblood Formation/Esbataottine Delorme Mount Kindle Formation/Road River fossils:Brachiopods,ostracodes,corals,trilobites,graptolites NO GEOLEX link cgkn link

Wilbarger Creek

61m Pennsylvanian sandstone TX(c) Buffalo Creek Comanche Creek fossils: GEOLEX link NO cgkn link Strawn

Wilberns

67m Cambrian,Upper limestone,shale TX(c) Cap Mountain/Riley Ellenburger/Tanyard fossils: GEOLEX link NO cgkn link

Wildcat Creek

? Permian,Lower shale TX(nc) Hords Creek Overall fossils:? GEOLEX link NO cgkn link Admiral

Wildcat Peak

thick Pennsylvanian rocks NV(c) Pinecone/Willow Canyon #WillowCanyon] ? fossils: GEOLEX link NO cgkn link

Wilkie Ranch Formation

504m Permian,Lower limestone,conglomerate,marlstone,chert TX(w) Hueco Formation cretaceous fossils:fusulinids,bryozoa,brachiopods,leaves,sponges,pelecypods,gastropods,cephalopods,corals,etc GEOLEX link NO cgkn link

Williams

158m Cretaceous,Upper sandstones CA(sw) Ladd Martinez?/Silverado fossils:marine invertebrates GEOLEX link NO cgkn link

Williams Canyon Limestone

24m Mississippian,Lower limestones,shales CO(wc) Manitou Limestone/Harding Formation/Fremont limestone Madison Group Madison Group/Leadville Limestone fossils:marine inverbetraes GEOLEX link NO cgkn link

Willow Canyon

Ordovician chert/siltstone NV(c) Pinecone Wildcat Peak fossils:None? GEOLEX link NO cgkn link Not to be confused with the Cretaceous Willow Canyon formation in AZ

Willow Lake Formation

23m Devonian.Middle dolomite,limestone,shale,anhydrite BC,NT,YT Bear Rock Lonely Bay fossils:? NO GEOLEX link cgkn link

Winchell Limestone

12m Pennsylvanian,Upper limestone,shale,sandstone TX Cedarton Ranger/Placid fossils:algae,crinoid fragments,bryozoans,brachiopods GEOLEX link cgkn link Canyon

Windermere SuperGroup

9000m Proterozoic,Upper rocks BC(ne),ID,WA Purcell Ottertail Formation/Jubilee Formation/Cranbrook Formation/Eager Formation Summit/Hector Formation/Carrol Creek fossils:? GEOLEX link cgkn link Windemere

Windsor Mountain Formation

68m Cambrian,Middle dolomite,limestone AB(wc),BC(ec) Elko Formation Damnation limestone fossils:trilobites NO GEOLEX link cgkn link

Windy Pass

thick Cambrian,Lower siltstones ID(se) Kasiska Quartzite Sedgwick Peak Quartzite fossils:ichnofossils GEOLEX link NO cgkn link Brigham Group

Winnipeg Formation

98m Ordovician,Middle sandstone,shale,siltstone MB(s),MN,MT(ne),ND,SD(nw),SK(s),WY Deadwood Formation Red River fossils: GEOLEX link cgkn link

Winnipegosis Formation

100m Devonian,Middle limestone,dolomite MB,MT,ND,SD Elm Point Limestone Prairie Formation Keg River fossils:marine invertebrates(abundant) GEOLEX link cgkn link Elk Point Group

Winterburn Shale

150m Devonian,Upper dolomite/limestone/evaporites AB Ireton Formation/Grosmont Formation/Hondo Wabamun Formation fossils: NO GEOLEX link cgkn link

Wichita

610m Permian,Lower sandstones,shales,conglomerate,clay OK,TX(nc) Coleman/Albany Clear Fork fossils:vertebrates GEOLEX link NO cgkn link Wichita

Wokkpash

130m Devonian,Lower sandstone,dolomite BC(ne) Muncho-McConnell Stone fossils: GEOLEX link cgkn link

Wolsey Shale

38m Cambrian, Middle shale,limestone MT,WY Flathead sandstone Meagher limestones fossils:Marine invertebrates GEOLEX link NO cgkn link Gros Ventre

Wood Canyon Formation

Up to 800 meters of mostly marine Ediacaran and Lower Cambrian shale sand sandstones with some non-marine beds in the middle part of the formation found in the SouthWestern Great Basin and adjacent Mojave Desert. It overlies the Stirling Quartzite and is overlain by the Zabriskie Quartzite

Fossils: ichnofossils. Sparse trilobites and archeocyathids A few ediacaran fossils from the basal parts of the formation.

Wood Shale

76m Triassic, Upper shale ID(se) Higham grit/Deadman Nugget fossils:None GEOLEX link NO cgkn link

Wood River

2000m+ Pennsylvanian,Middle-Permian,Lower shale,limestone,sandstone ID(c) Milligen Formation igneous rocks Copper River fossils:marine invertebrates GEOLEX link NO cgkn link Sun Valley

Woodbend Formation

700m Devonian,Upper rocks AB/BC(e)/MB(s)/MT/ND/SK(s) Beaverhill Lake Winterburn Cooking Lake Formation/Duvernay Formation/Ireton Formation fossils:marine invertebrates GEOLEX link cgkn link

Woodford Shale

213m Devonian,Upper-Missippian,Lower shale,chert OK(wc) Hunton,Thirtyone] Caney fossils: GEOLEX link NO cgkn link

Woodhurst Member

174m Mississippian,Lower-Mississippian,Middle limestone ID,MT,SK,UT,WY Paine Formation Mission Canyon Formation fossils: GEOLEX link NO cgkn link Madison Group

Woodman Formation

457m Mississippian sandstone,limestone NV(c),UT(wc) Madison Group Ochre Mountain fossils:corals,brachiopods GEOLEX link NO cgkn link

Woodpecker Limestone

137m Devonian,Middle limestone NV(c) Sentinel Mountain Dolomite Bay State Dolomite fossils:styolina GEOLEX link NO cgkn link

Woodside Quartzite

360m Triassic,Lower shale,limestone UT(ec) Dinwoody Park City/Phosphoria Thaynes fossils:bivalves GEOLEX link NO cgkn link

Woodward

91m Permian shale,sandstone,dolomite OK ? Quartermaster Double Mountain fossils: GEOLEX link NO cgkn link Woodward

Wyman Formation

Up to 3000 meters of altered Upper Proterozoic/Ediacaran? siltstone and minor limestone. It is found in the area of the Inyo,White,and Silverpeak ranges in California and Nevada. It's base is not exposed and no older Upper Proterozoic beds are known in the area. It is overlain by the Reed Dolomite. It is part of a thick sequence of Middle Cambrian, Lower Cambrian and late Proterozoic outer shelf sediments with different nomeclature than the corresponding nearer shore sediments found further East.

Fossils: Ichnofossils in the upper part of the formation.

Wyoming

914m Pennsylvanian-Triassic conglomerates,sandstones,shales,limestones,gypsums CO(c) bedrock/Maroon Formation ? fossils: GEOLEX link NO cgkn link

Yahatinda Formation

265m Devonian,Middle-Devonian,Upper dolomite,conglomerate,sandstone,siltstone AB(w) early Paleozoic Cairn Cedared Formation/Elk Point Group fossils:none? NO GEOLEX link cgkn link http://weblex.nrcan.gc.ca/html/016000/GSCC00053016741.html

Yanks Peak

thick Cambrian rocks BC Dome Creek | fossils: NO GEOLEX link NO cgkn link

Yellow Hill Limestone

More than 200 meters of Lower Ordovician limestone and conglomerate found in Eastern Nevada. It is a member of the Pogonip group. It apparently overlies the Mendha Limestone and is overlain by the Tank Hill Limestone

Fossils: Sparse at most levels, but diverse. Some are silicified.

Yellowpine

37m Mississippian,Middle limestone AZ(w),CA(se),NV(sw) Arrowhead Limestone Bird Spring fossils:corals GEOLEX link NO cgkn link Monte Cristo Limestone

Yeso Formation

610m Permian,Lower sandstone,shale,limestone,gypsum NM(se),TX(w) Abo San Andreas fossils: GEOLEX link NO cgkn link Manzano Group

Yogo Limestone

20m Devonian,Upper limestone,shale MT(c) Dry Creek shale Jefferson fossils:sparse marine invertebrates GEOLEX link NO cgkn link

Yohin Formation

157m Mississippian,Lower sandstone,siltstone,shale,limestone NT Besa River Shale Clausen Besa River Shale fossils:sparse marine invertebrates NO GEOLEX link cgkn link

Youghall Formation

198m Pennsylvanian sandstone,limestone CO(w),UT(e) Belden,Hells Canyon Formation Weber Formation fossils:marine invertebrates-brachiopods, corals, algae, crinoids, fusulinids. GEOLEX link NO cgkn link

Young Peak Dolomite

183m Cambrian,Middle dolomite UT(wc) Abercrombie formation Trippe Limestone fossils:None GEOLEX link NO cgkn link

Yukon

Pleistocene silt,gravel AK(ne) ? | fossils:mammals,gastropods GEOLEX link NO cgkn link

Yusezyu

thick Paleozoic,upper sandstone,limestone,slate BC,NT Narchilla Formation Algae fossils:ichnofossils NO GEOLEX link cgkn link Windermere

Zabriskie Quartzite

A white, very fine grained white Lower Cambrian quartzite up to several hundred meters thick found in the SouthWestern Great Basin and adjacent Mojave Desert. It overlies the Wood Canyon formation and is overlain by the Latham Shale/Carrara Formation

Fossils: Essentially, none. A single trilobite cephalon is reported.

Zortman

198m Cambrian,Upper-Ordovician,Lower shales,conglomerates MT | Deadwood Formation fossils:marine invertebrates GEOLEX link NO cgkn link

Maps and Figures

Geologic Maps


New York Generalized Bedrock Geology of NY

Overview of NY Geology


Vermont State map http://www.anr.state.vt.us/DEC/geo/centmap.htm



Formations

See Rocks


References


Copyright 2006-2012 Donald Kenney (Donald.Kenney@GMail.com). Unless otherwise stated, permission is hereby granted to use any materials on these pages under the Creative Commons License V2.5.

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