LIST R - ROCK UNITS - ALPHABETICAL LIST
Aberystwyth Grits Ash Hollow Formation Abo Formation Ashe Formation Absaroka Supergroup Asmari Formation Acatlan Complex Astoria Formation Ackley Granite Asu River Group Acoite Formation Athabasca Formation Acungui Group Athgarh Sandstone Adamantina Formation Atoka Formation Adirondack Anorthosite Austin Chalk Admire Group** Austin Group Agbada Formation** Aux Vases Sandstone Ager Formation Avon Park Formation Agrio Formation Aycross Formation Aguacate Group Aztec Sandstone Aguja Formation Baca Formation Akiyoshi Limestone Badami Series Al Khlata Formation Bagh Beds Albert Formation Bahariya Formation Aldridge Formation Bainbridge Formation Alisitos Formation Bajo Barreal Formation Allegheny Group Baker Coal* Allen Formation* Baker Lake Group Almond Formation Bakhtiari Formation Alpine Schist* Bakken Formation** Altyn Limestone Balaklala Rhyolite Alum Shale Formation* Baldonnel Formation Ambo Group** Ballachulish Complex* Ameki Formation Ballantrae Complex Americus Limestone Member Baltimore Gneiss Ames Limestone Bambui Group Amisk Group Banded Gneissic Complex Amitsoq Gneiss Bandelier Tuff Ammonoosuc Volcanics Banff Formation Amsden Formation Bangor Limestone Anahuac Formation Banquereau Formation* Andalhuala Formation Banxi Group Andrew Formation* Baota Formation Animikie Group Baquero Formation Annot Sandstone Barabash Suite Anshan Group Baraboo Quartzite Antalya Complex Baraga Group Antelope Shale Barail Group Antelope Valley Limestone Baralaba Coal Measures Antietam Formation Barnett Shale Antimonio Formation* Barnwell Formation Antlers Sands Barre Granite Antrim Shale** Barreiras Formation Apache Group Barren Measures* Apache Leap Tuff** Barstow Formation Aquia Formation Bartlesville Sand Ara Group* Barton Beds Arab Formation Baskunchak Series* Arapien Shale Bass Islands Dolomite Aravalli System Battery Point Formation Araxa Group Bauru Group Arbuckle Group** Bay of Islands Ophiolite Arcadia Formation* Baynunah Formation Areado Formation Bazhenov Formation Arikaree Group** Beacon Supergroup* Arkansas Novaculite** Bear Gulch Limestone Member Arroyo Ojito Formation** Bear River Formation * Does not autopost. ** Partially autoposted. 2 LIST R - ROCK UNITS - ALPHABETICAL LIST
Bearpaw Formation Bone Spring Limestone Beaufort Formation* Bone Valley Formation Beaufort Group* Bonner Formation Beaumont Clay Bonneterre Formation Beauvoir Granite* Boom Clay Beaverhead Formation* Boone Formation Beaverhill Lake Group Bootlegger Cove Clay Bedford Shale** Borden Group Beech Creek Limestone Member Borrowdale Volcanic Series Beekmantown Group Bossier Formation Beil Limestone Member Boston Bay Group* Bela Ophiolites** Botucatu Formation* Bell Canyon Formation Bowden Formation Belle Fourche Shale Bowers Supergroup** Belly River Formation Bowser Formation Belt Supergroup Bowser Lake Group Bembridge Marls Boyle Dolomite Benton Formation Bracklesham Group Benxi Formation Brallier Shale Berea Sandstone Brassfield Formation Berwick Formation** Brazil Formation Betts Cove Ophiolite Breathitt Formation Bevier Coal Brent Group Bhander Group* Bridge Creek Limestone Member Bhuj Series Bridger Formation Bidahochi Formation Brigham Group Big Injun Sandstone Bright Angel Shale Big Snowy Group Brockman Iron Formation Bigby-Cannon Limestone Broken River Formation* Bigfork Chert Bromide Formation Bighorn Dolomite Broom Formation Bijawar System Browns Park Formation Bird Spring Formation** Brule Formation Birdbear Formation Brunner Coal Measures Birkhead Formation Brunswick Formation** Bisbee Group** Brushy Basin Shale Member Bishop Tuff Brushy Canyon Formation Bitter Springs Formation Bucatunna Formation Biwabik Iron Formation Buchans Group Black Creek Formation Buckley Formation Black Mingo Group Buckner Formation Black River Group Bucksport Formation Blackhawk Formation Buda Limestone Blackleaf Formation Buda Marl Blackstone Formation* Bulawayan Group Blackstone Group* Bulldog Shale Blackwater Draw Formation Bullfrog Member Blaine Formation Bulli Seam Blaini Formation Bullion Creek Formation Blair Formation Burbank Sand Blairmore Group Burgess Shale Blake River Group Burlington Limestone Blake-Bahama Formation Burra Group Blondeau Formation Burro Canyon Formation Bloomsburg Formation Bursum Formation Bloyd Formation Byram Formation Bluesky Formation Cabaniss Formation Bluff Formation* Cabo Ortegal Complex* Bluff Sandstone* Cache Creek Group* Bluffport Marl Member Cadeby Formation Blufftown Formation Cadomin Formation Boggy Shale Cahill Formation Bonanza Group Calaveras Formation Bonanza King Formation
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Calera Limestone Cheyenne Sandstone Calipuy Group** Chickamauga Group Caloosahatchee Formation** Chickasawhay Formation Calvert Bluff Formation** Chilhowee Group Calvert Formation Chilliwack Group Cambridge Argillite* Chinji Formation Canadaway Group Chinle Formation Candeias Formation Chipola Formation Canning Formation* Chiquimil Formation Canyon Group Choiyoi Group* Cape Elizabeth Formation Chonta Formation Cape Phillips Formation** Chopawamsic Formation Capistrano Formation Choptank Formation Capitan Formation Chouteau Limestone Caracas Group Chowan River Formation Carapita Formation** Christopher Formation Carbondale Formation Chuanlinggou Formation Cardium Formation Chuar Group Carlile Shale Chuckanut Formation Carlton Rhyolite Chugwater Formation* Carmel Formation Chumstick Formation Carrara Formation Cisco Group Carrara Marble** Citronelle Formation Carrizo Mountain Formation Claiborne Group Carrizo Sand Clarno Formation Casco Bay Group Claron Formation Caseyville Formation Clays Ferry Formation Casper Formation** Clayton Formation Castaic Formation Clear Fork Group Castile Formation Clearwater Formation Castle Hayne Limestone Cleveland Member Castlegate Sandstone Climax Porphyry Catahoula Formation** Clinch Sandstone Catalina Schist* Clinton Group Catoche Formation Cloridorme Formation Catoctin Formation Closepet Granite** Catskill Formation** Clough Formation Cedar City Formation Cloverly Formation Cedar Mountain Formation Coast plutonic complex* Cedar Valley Formation Coast Range Ophiolite Central Rand Group Coastal Batholith* Cerro del Pueblo Formation Cobalt Group Chadron Formation Cockfield Formation Chainman Shale Coconino Sandstone Challis Volcanics** Codell Sandstone Member Chambira Formation* Cody Shale Chanares Formation Coeymans Formation Changcheng System Cohansey Formation Changxing Formation Coker Formation Changzhougou Formation Coldbrook Group Chappel Limestone Collier Shale** Charles Formation Colorado Group Charlie Lake Formation Colton Formation Chase Group Columbia River Basalt Group Chatsworth Formation Columbus Limestone Chattanooga Shale** Colville Group Chazy Group Comanche Peak Limestone Chelmsford Formation Conasauga Group Chelmsford Granite Condrey Mountain Schist Chemung Formation Conemaugh Group Cherokee Group Conococheague Formation Cherry Canyon Formation Cook Mountain Formation Chesapeake Group** Copacabana Group Cheshire Formation* Copley Greenstone
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Copper Harbor Conglomerate Dongying Formation Copper Ridge Dolomite Douglas Group Corella Formation Doushantuo Formation Cortlandt Complex Dry Branch Formation Cotton Valley Group Dubuque Formation Cottonwood Limestone Duchesne River Formation Council Grove Group Dugger Formation Cow Head Group** Dundee Limestone Cowlitz Formation Dunderberg Shale Cozy Dell Formation Dunham Dolomite Crab Orchard Formation Dunkard Group** Crab Orchard Mountains Group Dunlin Group Crater Flat Tuff Dunvegan Formation Crato Formation Duperow Formation Creede Formation Duplin Formation Crescent Formation Duwi Formation Crevasse Canyon Formation Dwyka Formation** Croatan Formation Eagle Bay Formation* Crooked Creek Formation Eagle Ford Formation Crow Mountain Sandstone Eagle Mills Formation* Crystal River Formation Eagle Sandstone Cuddalore Series Earn Group** Cuddapah System East Berlin Formation Culebra Dolomite Member Eastover Formation Cumberland Group Eau Claire Formation Cupido Formation Ecca Group Cutler Formation Echooka Formation Cuyahoga Formation Eden Shale Cypress Hills Formation* Edmonton Formation Cypress Sandstone Edwards Formation Dakhla Shale* Ekofisk Formation* Dakota Formation El Paso Group Damara System Elberton Granite Dammam Formation Elk Point Group Damuda Series Elkhorn Mountains Volcanics Danville Coal Member Ellenburger Group Davidsville Group Ellensburg Formation Davis Formation* Elliot Formation* Dawson Canyon Formation Ellis Bay Formation Deadwood Formation* Ely Limestone Deccan Traps* Ely Springs Dolomite Decorah Shale Emeishan Basalts* Dedham Granodiorite Empire Formation* Deer Lake Group* Endicott Group** Deicke Bentonite Bed Entrada Sandstone Delaware Limestone Epler Formation Delaware Mountain Group Ervine Creek Limestone Delhi Supergroup Escondido Formation Demopolis Chalk Escucha Formation Dengying Formation Eskridge Shale Denver Formation* Esna Shale Deschutes Formation Espanola Formation Detroit River Group Espinhaco Supergroup Dhanjori Group Esplanade Sandstone Member Dharwar Supergroup Essen Beds Diamond Peak Formation Estrada Nova Formation* Difunta Group* Etchegoin Formation Dinosaur Park Formation Etive Formation Dinwoody Formation Eureka Quartzite Djadokhta Formation Eureka Sound Group* Dockum Group Eutaw Formation Doig Formation Everton Formation Dolgeville Formation Ewekoro Formation Domanik Formation Excello Shale
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Excelsior Group** Geirud Formation** Exshaw Formation** Gemericum** Fairview Formation Genesee Group Fall River Formation George River Group Famatina System* Georgetown Formation Fayetteville Formation Gething Formation Feltville Formation Gfohl Unit* Fernie Formation Ghareb Formation Fernvale Formation Gharif Formation Ferrar Group Ghazij Formation Ferron Sandstone Member Ghost Rocks Formation Fig Tree Group Gila Conglomerate** Fillmore Formation Gile Mountain Formation Fish Canyon Tuff Gilman Formation Fish Haven Dolomite Gizzard Group Fisset Brook Formation Glasford Formation Flagstaff Formation Glen Canyon Group** Flathead Sandstone Glen Mountains Complex Glen Rose Formation Fleming Formation Glenarm Series Flinton Group Glendon Limestone Florissant Lake Beds** Glenns Ferry Formation** Flournoy Formation Glenshaw Formation Fontainebleau Sandstone Glenwood Shale Forbes Formation Glorieta Sandstone Fordham Gneiss Gog Group Fort Dodge Gypsum Golconda Formation Fort Hays Limestone Member Golden Valley Formation Fort Payne Formation Goldenville Formation Fort Riley Limestone Goliad Sand Fort Union Formation* Gondwana System* Fortescue Group** Goose Egg Formation* Fortress Mountain Formation Gosau Formation Fountain Formation** Gowganda Formation Fourchu Group Grande Ronde Basalt Fox Hills Formation Graneros Shale Francis Creek Shale Grayburg Formation Franciscan Complex** Great Oolite Series Franconia Formation Great Scar Limestone Freda Sandstone Great Smoky Group Fredericksburg Group Great Valley Sequence Freeport Formation Green River Formation Freites Formation Green Tuff Formation Fremouw Formation Greenbrier Limestone Frenchman Springs Member Greenhorn Limestone Frio Formation Greenland Gap Group Frontier Formation Greenland Group* Fruitland Formation Grimmertingen Fulmar Formation Grimsby Sandstone Furnace Creek Formation Grosmont Formation Furnas Formation Grund Formation Fusselman Dolomite Gualcamayo Formation Futaba Group Guandacol Formation** Galena Dolomite Guantao Formation Galesville Sandstone Gubik Formation Galice Formation Guelph Formation Gallup Sandstone Guilmette Formation Gammon Ferruginous Member Gull River Formation Gander Lake Group Gunflint Iron Formation Gangpur Series Haast Schist* Garhwal Group Hackberry Formation Garn Formation* Hadar Formation Gates Formation* Hale Formation Gault Clay Gawler Range Volcanics
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Halfway Formation* Horton Group** Halifax Formation Hosston Formation Hallstatt Limestone Huanglong Formation Hamersley Group** Huber Formation Hamilton Group Hue Shale Hampden Basalt Hueco Limestone Hampshire Formation Hughes Creek Shale Hanifa Formation Hume Formation* Hanna Formation Hunsruck Shale Hanson Creek Formation** Hunton Group** Harbour Main Group Huqf Supergroup* Harebell Formation Huron Member Harrodsburg Limestone Hurwitz Group Hartland Formation Hutchinson Salt Member Hartselle Sandstone Hutuo Group Hartshorne Sandstone Idaho Springs Formation Hat Creek Basalt Illawarra Coal Measures Hatchetigbee Formation Imo Formation Hatteras Formation Imo Shale Hawkesbury Sandstone Imperial Formation* Hawthorn Formation Interlake Formation Hayes River Group Intertrappean Beds* Haymond Formation Inyan Kara Group Haynesville Formation Ipswich Coal Measures Hazel Formation Ipururo Formation Hazelton Group* Irati Formation Hazens Notch Formation* Iron Ore Group Hazeva Formation Isachsen Formation Heath Formation Ishbel Group** Heather Formation Itapecuru Formation Hecla Hoek Formation Itarare Subgroup Hector Formation* Ituzaingo Formation** Heemskirk Granite Ivishak Formation* Helderberg Group** Izumi Group Helena Formation J Sandstone* Hell Creek Formation J-M Reef Hemlock Conglomerate Jabalpur Series Hemlock Formation Jackfork Group Henderson Gneiss** Jackson Group Hennessey Formation Jacobsville Sandstone* Henryhouse Formation Javelina Formation Hermosa Formation Jeanne d'Arc Formation Herrin Coal Member Jefferson Group Hidden Valley Dolomite** Jeffersonville Limestone High Bridge Group Jiaodong Group Highland Complex* Joana Limestone Hillabee Chlorite Schist Joggins Formation Hilliard Shale John Day Formation** Hiltaba Suite Johnnie Formation Hinton Formation Johns Valley Formation Holder Formation Josephine Ophiolite Holston Formation Josephine Peridotite Holyoke Basalt Judea Group Holz Shale Judith River Formation Honaker Trail Formation** Juniata Formation Honda Group Jupiter Member Honna Formation Kabuh Formation Hooggenoeg Formation Kaibab Formation Hoosac Formation* Kaimur Sandstone* Horn Plateau Formation Kaiparowitz Formation Hornbrook Formation Kaladgi System Horoman Complex* Kalgoorlie System Horseshoe Canyon Formation Kalibeng Formation Horsethief Creek Group Kamthi Formation
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Kanawha Formation La Luna Formation Kanayut Conglomerate La Meseta Formation Kanguk Formation La Quinta Formation Kanmantoo Group La Salle Limestone Kansas City Group La Ventana Sandstone Kapuni Group Laberge Group Karewa Group Labette Shale Karmutsen Group Laborcita Formation** Karoo Supergroup* Ladd Formation Kasauli Series** Ladner Group Kaskaskia Sequence Ladoga Series* Kayak Shale Laetolil Beds Kayenta Formation** Lagoa Feia Formation Kazusa Group Lagunillas Formation* Keefer Sandstone Lake Valley Formation Keg River Formation Lakota Formation Kekiktuk Conglomerate Lameta Formation Kemik Sandstone Lamotte Sandstone Kenai Group Lancara Formation Keokuk Limestone Lance Formation Kewanee Group Laney Shale Member Key Largo Limestone Lansing Group Keyser Limestone** Laramie anorthosite complex Khorat Group** Laramie Formation Khorat Group Lardeau Group Khuff Formation Lathi Formation Kiev Member Latrobe Group* Kimmeridge Clay Lavery Till Kindblade Formation Lawrence Formation Kingak Shale Leadville Formation Kingsdown Formation Lebo Member Kingsport Formation Lecompton Limestone Kingston Peak Formation Leda Clay Kinzers Formation Ledbetter Slate Kiowa Formation Leduc Formation Kirkpatrick Basalt Lee Formation Kirkwood Formation* Leinster Granite** Kirtland Shale Leman Sandstone Formation Kisseynew Complex Lenoir Limestone Kittanning Formation Levack Gneiss** Kittery Formation** Levis Shale Klodzko Unit* Lewis Shale Knife Lake Group Lewisian Complex** Knox Group** Lexington Limestone Kobiwako Group** Liaohe Group Kodiak Formation Liard Formation Kombolgie Formation Lilydale Limestone Koobi Fora Formation** Lime Creek Formation Kootenay Formation Lincoln Creek Formation** Kope Formation Lincolnshire Limestone* Korenevskaya Formation* Lisan Formation Krebs Group Lisbon Formation Krivoy Rog Series Lisburne Group** Krol Formation* Little Falls Formation* Kromberg Formation Littleton Formation Krosno Beds Llajas Formation Kunavaram Series* Lockatong Formation Kunga Group** Lockport Formation Kunyang Group Lodgepole Formation Kurnool System* Logan Canyon Formation Kursk Series Logan Formation Kuskokwim Group London Clay La Casita Formation Longarm Formation**
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Longtan Formation Marshalltown Formation Lookingglass Formation Martin Formation* Lopez de Bertodano Formation Martinsburg Formation Lorrain Formation Mary Lee Coal Lost Burro Formation Mascot Dolomite Louann Salt* Masset Formation Loup Fork Group** Matagamon Sandstone Loveland Loess Matapedia Group** lower Gondwana System* Matilija Formation Lower Greensand Mattoon Formation Lucas Formation* Mauch Chunk Formation Ludlow Member Maude Group* Ludlowville Formation Maynardville Limestone Luning Formation Mazama Ash Luoquan Formation McCloud Limestone Lushs Bight Group McCoy Creek Group Lutzow-Holm Complex* McHugh Complex Luxembourg Sandstone McKenzie Formation Lynchburg Formation McMurray Formation Lyons Sandstone McNamara Group Mabou Group McPherson Formation Macae Formation Meade Peak Member Macaubas Group Medina Formation* Macumber Formation Meguma Group Maden Complex Meliata Unit* Madera Formation** Mendez Formation* Madison Group Menefee Formation Madrid Formation* Mentor Beds Maevarano Formation Menuha Formation Magdalena Group** Merced Formation** Magothy Formation Mercia Mudstone Mahakoshal Group** Merrimack Group** Mahantango Formation Mesa Rica Sandstone Maikop Series Mesaverde Group Maiolica Limestone** Metaline Limestone Majiagou Formation Miami Limestone Malan Loess Mic Mac Formation Malmani Subgroup Michelle Formation Manakacha Formation Michigamme Formation Mancos Shale Middendorf Formation Manhattan Formation Middle Run Formation* Manitou Formation Midway Group Manilus Formation Miette Complex Manning Canyon Shale Miette Group Manning Formation* Mikabu System Mannville Group Milk River Formation Mansalay Formation Millboro Shale Mansfield Formation Millbrig Bentonite Bed Manx Group Millstone Grit Maokou Formation Minas Supergroup** Maquoketa Formation Minnelusa Formation** Maranon Complex Minturn Formation Maravillas Formation* Mirador Formation Marble Falls Group Miramichi Group Marca Shale Member Mishash Formation Marcellus Shale Misoa Formation Mardin Formation* Mispec Group Maria Farinha Formation Missi Group Marianna Limestone Mission Canyon Limestone Marilia Formation Mission Valley Formation Marjum Formation Missisauga Formation Marmaton Group Missoula Group Maroon Formation** Mist Mountain Formation** Marquette Range Supergroup Mitu Group
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Mizunami Group Negaunee Iron Formation Modelo Formation Nenjiang Formation Moenave Formation** Ness Formation Moenkopi Formation Neuquen Group Molteno Formation New Albany Shale** Monashee Complex* New Red Sandstone* Monmouth Group New River Formation Monongahela Group New York City Group* Montana Group Newark Supergroup** Monte Cristo Limestone Newcastle Coal Measures Monteagle Limestone Newcastle Sandstone Monterey Formation* Newer Volcanics** Montesano Formation Newland Limestone Montney Formation Newman Limestone Montoya Group Neyveli Lignite Moodys Branch Formation Ngorora Formation Mooreville Chalk Nicola Group Moosebar Formation Nicoya Complex** Moreno Formation Nihewan Formation Morien Group Nikolai Greenstone* Morrison Formation Niniyur Group Morrow Formation Niobrara Formation Moscow Formation Nipissing Diabase Motojuku Formation Nisku Formation Moty Formation* Nokomis Group Mount Messenger Formation Nonesuch Shale Mount Read Volcanics Noonday Dolomite Mount Scopus Group* Nopah Formation Mount Scott Granite Nordegg Member Mount Shields Formation Normanskill Formation Mount Simon Sandstone Norphlet Formation Mowry Shale North Horn Formation* Muddy Creek Formation** North Shore Volcanics Muddy Sandstone Novorayskoe Formation Muderong Shale Nubian Sandstone* Mural Limestone Nugget Sandstone** Murihiku Supergroup** Nuk Gneiss Muro Group* Oak Hill Member Murphy Marble Oakville Sandstone Mushan Formation Ocala Group Muth Quartzite Ocoee Supergroup* Nacimiento Formation Oficina Formation Nahanni Formation Ogallala Formation Naheola Formation Ohio Shale Naknek Formation Oil Creek Formation* Nama Group* Ojo Alamo Sandstone Namaqualand metamorphic complex* Oktemberyan Series Nanafalia Formation Old Crow Tephra Nanaimo Group* Old Red Sandstone Nanjemoy Formation Oldman Formation Nansen Formation* Olentangy Shale Nantuo Formation Olmos Formation Nanushuk Group Omma Formation Napier Complex Omo Group** Nari Series Onaping Formation Narita Formation Oneota Dolomite Narrabeen Group Onondaga Limestone Narragansett Pier Granite** Onverwacht Group Natih Formation Ootsa Lake Group Navajo Sandstone Opalinus Clay Navarro Group Opeche Shale Navesink Formation Opemisca Group Neapolitan Yellow Tuff Oquirrh Formation** Neda Formation Orca Group
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Oread Limestone Pinda Formation Oriente Group Pine Shadow Member Oriskany Sandstone Pinecrest Beds Orocopia Schist Piney Point Formation Oronto Group Pinnacle Formation* Orr Formation Pinney Hollow Formation Ortega Group Pinyon Conglomerate Osaka Group Pioche Shale Osler Series Pirabas Formation** Otavi Group Pitkin Limestone Ovruch Series Pittsburgh Coal Oxford Clay Platteville Formation Pacoota Sandstone** Plattsburg Limestone Paganzo Group Plattsmouth Limestone Member Page Sandstone Pleasanton Group Pagoda Formation* Pocahontas Formation Pahrump Series Pocatello Formation Paintbrush Tuff Pocono Formation Pakawau Group Pogonip Group Palliser Formation Point Loma Formation Paluxy Formation Point Lookout Sandstone Panchet Series Poleta Formation Parachute Creek Member Poltava Series Paradox Member Pongola Supergroup Pardonet Formation Ponta Grossa Formation Park City Formation Popovich Formation Parkman Sandstone Porsanger Dolomite Formation* Parkwood Formation Portage Lake Lava Series Partridge Formation Porters Creek Formation Pasayten Group Portland Formation Paskapoo Formation* Posidonia Shale Passa Dois Group Potomac Group Passaic Formation** Potrerillos Formation* Peace River Formation* Potsdam Sandstone Peace Valley Beds Pottsville Group Peach Springs Tuff Poway Conglomerate Pearlette Volcanic Ash Poznan Clays Pearsall Formation Pozo Formation* Pebas Formation Prairie Bluff Chalk Pebble Shale Prairie du Chien Group Peedee Formation Prairie Evaporite Peel Sound Formation** Presumpscot Formation Pelona Schist Pretoria Group Penarth Group Price Formation Peninsular Gneiss Price River Formation Pennington Formation Prichard Formation Penobscot Formation** Pride Mountain Formation Penrhyn Slate Prince Albert Group Peoria Loess Prince Creek Formation Perry Formation Protopivskaya Formation Perry Mountain Formation Pucangan Formation Petersburg Formation Pucara Group** Petersburg Granite Puente Formation Petrified Forest Member Puerto Madryn Formation Phosphoria Formation Punchbowl Formation Phuket Group** Puncoviscana Formation* Pico Formation Pungo River Formation Pictou Group** Punta Mosquito Formation Picture Gorge Basalt Purcell System Pictured Cliffs Sandstone Purisima Formation Pierre Shale Pysht Formation** Pilgrim Formation Qalibah Formation Pilot Shale** Qingbaikou System
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Qingshankou Formation Rondout Formation** Qinling Group Rooiberg Group Qixia Formation Roraima Formation* Qorqut Granite Rosario Formation Quantou Formation Rose Canyon Formation Queen Charlotte Group Rose Hill Formation Queen City Formation Rose Run Sandstone** Queen Formation Ross Formation* Queenston Shale Roxana Silt Racine Dolomite Roxbury Conglomerate* Raghavapuram Shales Roy Group Rajmahal Series Rundle Group* Ramp Creek Formation Rustenburg Layered Suite Rampart Group Rustler Formation Ramparts Formation Rye Complex* Rangal Coal Measures Ryukyu Group Rangeley Formation** Saddle Mountains Basalt Ranger Canyon Formation Sadlerochit Group* Raniganj Formation Sag River Sandstone Rannoch Formation Sagavanirktok Formation* Raritan Formation Saginaw Formation Raton Formation* Saint George Group Ravalli Group Saint Laurent Limestone Ravenscrag Formation Saint Louis Limestone Read Bay Formation** Saint Mary River Formation Reagan Sandstone Saint Marys Formation Red Eagle Limestone Saint Peter Sandstone Red Fork Sandstone Saint Regis Formation Red Mountain Formation* Sainte Genevieve Limestone Red Peak Formation Sakoli Group** Red River Formation Salado Formation Redonda Formation Salem Limestone Redwall Limestone Salina Group Reedsville Formation Salt Lake Formation Renault Formation Salt Wash Sandstone Member Renmark Group** Salta Group* Renova Formation San Andres Formation* Retort Phosphatic Shale Member San Diego Formation* Revett Quartzite San Felipe Formation* Rexroad Formation San Gregorio Formation* Rice Lake Group San Jose Formation* Ridge Route Formation San Juan Formation* Riggins Group* San Lorenzo Formation* Rincon Formation* San Miguel Formation* Ringerike Sandstone** San Onofre Breccia Ringold Formation San Rafael Group Rio Bonito Formation Sandia Formation* Rio Colorado Formation* Sandia Granite Rio do Rasto Formation Sandilands Formation** Ripley Formation Sangerville Formation Road River Formation** Santa Barbara Formation* Roan Supergroup Santa Barbara Subgroup* Roberts Mountains Formation Santa Clara Formation* Robertson Bay Group* Santa Cruz Formation* Robles Formation Santa Cruz Mudstone Roca Formation* Santa Fe Group* Rochester Formation Santa Lucia Formation* Rock Lake Shale Member Santa Margarita Formation Rock Springs Formation Santa Maria Formation* Rocknest Formation* Santa Maria Group* Rockwood Formation Santa Rosa Sandstone Rodessa Formation Santa Susana Formation Rome Formation Santana Formation Santee Limestone
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Saratoga Chalk Sirius Group Sarayaquillo Formation Sisquoc Formation Sargur Group Siwalik System** Sarmiento Formation** Skagit Gneiss* Saugus Formation** Skiddaw Slates Sauk Sequence** Skull Creek Shale Sausar Series Slave Point Formation Savanna Formation Sleepy Dragon Complex** Scaglia Formation* Sligo Formation Scarborough Formation* Smackover Formation Schenectady Formation Smartville Complex Schoonover Sequence Smithville Formation Schrader Bluff Formation Smithwick Shale Schuler Formation Smoky Hill Chalk Member Seboomook Formation Snoqualmie Batholith** Selma Group Snowslip Formation Semail Ophiolite* Sobral Formation** Semata Formation Soda Lake Shale Member** Seminole Formation Sokoman Formation Semri Series Soldiers Cap Group Sentinel Butte Formation Solnhofen Limestone Serebryanka Formation Sonyea Group Serra Geral Formation** Sparagmite Group* Sespe Formation Sparta Sand Seven Rivers Formation Spearfish Formation* Severn Formation* Speeton Clay Shadow Lake Formation Spergen Formation Shady Dolomite Spirit River Formation Shahejie Formation** Spiro Sandstone Shakopee Formation Spokane Formation Shannon Sandstone Member Spoon Formation Shanxi Formation** Springer Formation Shap Granite Springfield Coal Member Sharon Conglomerate Spuhler Peak Formation** Sharon Springs Member Stanley Group Shaunavon Formation Stanton Formation Shawangunk Formation** Star Point Sandstone Shawnee Group Statfjord Formation Sheep Pass Formation* Staunton Formation Shepard Formation Stearns Shale Sherridon Group Stellarton Group Sherwood Sandstone Stevens Sandstone Shihezi Formation Stillwater Complex Shimanto Group Stirling Quartzite Shimosa Group Stockton Formation* Shinarump Member Stone Corral Formation Shiranish Formation Stones River Group Shoo Fly Complex** Stormberg Series Shuaiba Formation Straight Cliffs Formation Shuangqiaoshan Group Strawn Series Shublik Formation Stuhini Group Shubuta Member Stump Formation Shungura Formation** Sturgis Formation Siberian Traps* Subathu Formation Sicker Group** Sulphur Point Formation Sierra Ladrones Formation* Summerville Formation Signal Hill Formation Sunbury Shale Silverado Formation Sundance Formation Silvretta Group Sunniland Limestone Simpson Group Sunrise Formation Singhbhum Granite Supai Formation** Singleton Coal Measures* Surma Group Sinjar Formation Sussex Sandstone Member Sioux Quartzite Suwannee Limestone
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Swan Hills Formation Toroweap Formation Swan Peak Formation Tradewater Formation Swauk Formation Transvaal Supergroup Swaziland Sequence Traverse Group Swaziland Supergroup Travis Peak Formation Swift Formation Tremembe Formation Sylvania Formation Trenton Group Table Head Group Trinity Group Table Mountain Group* Troodos Ophiolite* Taihua Group Tropic Shale Taishu Group Tubarao Group** Taiyuan Formation** Tulare Formation** Takla Group Tulghes Series Tal Formation* Tullock Member Talang Akar Formation** Tully Limestone Talchir Formation Tunguska Series Talchir Series Tununk Member Talkeetna Formation Tuolumne Intrusive Suite Talladega Group** Tura Formation* Tallahatta Formation Tuscaloosa Formation Tallulah Falls Formation* Tuscarora Formation Tamiami Formation Tuscumbia Limestone Tananao Schist Twiggs Clay Tansill Formation Twilight Gneiss Tapeats Sandstone Twin Creek Limestone Tapley Hill Formation Twin River Group** Taratash Complex Twin Sisters Dunite Tarbert Formation Two Medicine Formation Tarma Group** Tyee Formation Taylor Group* Tyler Formation* Taylor Marl Tyonek Formation Teapot Sandstone Member U-Bar Formation Tejon Formation Udokan Series Temblor Formation Uinta Formation Tensleep Sandstone** Uinta Mountain Group Tepee Trail Formation Umberatana Group Tesnus Formation Umpqua Formation Tesuque Formation Unayzah Formation Tetagouche Group Underhill Formation* Tetori Group** Unkar Group Thamama Group Uonuma Group** Thaynes Formation upper Gondwana System* Thebes Formation Upper Old Red Sandstone Thirtyone Formation Usa Series Thomson Formation Usuginu Conglomerate Timbered Hills Group Utica Shale Timiskaming Group Uvalde Gravel Tintic Quartzite Vaca Muerta Formation Tioga Bentonite Vadito Group Tippecanoe Sequence** Val Gardena Sandstone Tirrawarra Sandstone** Valdez Group Tiva Canyon Member Valentine Formation Todilto Formation Valhalla Complex* Tokai Group** Valmy Formation Tonganoxie Sandstone Vaqueros Formation** Tongue River Member Vassalboro Formation Tonoloway Limestone Ventersdorp Supergroup** Tons Member Verde Formation Toolebuc Formation Vermilion granitic complex Topopah Spring Member Vermillion Creek coal bed Tor Formation* Vetluga Series Torlesse Supergroup* Vicksburg Group Toro Formation* Viking Formation Torok Formation Vinini Formation
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Viola Limestone Williams Formation Virginia Formation Williamsburg Formation Vivian Formation Williamsport Sandstone Voltzia Sandstone Willwood Formation Vryheid Formation Willyama Supergroup Wabamun Group Wilmington Complex Wabaunsee Group Wilpena Group Waccamaw Formation Wind River Formation Wahoo Limestone Windermere System Waikato Coal Measures Windsor Group Waitemata Group Wingate Sandstone** Waits River Formation** Winnipeg Formation Walden Creek Group Winnipegosis Formation Waldron Shale Winton Formation Wall Creek Member Wissahickon Formation Wallace Formation Witwatersrand Supergroup Wanapum Basalt Wolkberg Group Wann Formation Wollaston Group Wapanucka Limestone Womble Shale Wapiti Formation* Wonewoc Formation Warkalli Formation** Wonoka Formation Warrawoona Group Wood Canyon Formation* Warsaw Formation Wood Mountain Formation Wasatch Formation Wood River Formation** Wasekwan Group Woodbine Formation Washita Group Woodbury Clay Watahomigi Formation Woodford Shale** Waterberg System Woods Hollow Shale Waterville Formation Wreford Limestone Waterways Formation Wristen Formation Weald Clay Wufeng Formation Weber Sandstone* Wumishan Formation Wedron Formation Wutai Group* Wellington Formation Wyandot Formation Wells Formation** Wyandotte Limestone Wenlock Limestone Wyman Formation Werillup Formation Xiong’er Group Werra Series Xishanyao Formation Wescogame Formation Yacoraite Formation West Falls Formation Yahuarango Formation Westerly Granite Yakataga Formation** Westwater Canyon Sandstone Member Yakima Basalt Wetterstein Limestone Yakoun Group Wewoka Formation Yamhill Formation Wheeler Formation Yates Formation Whirlpool Sandstone Yazoo Clay White Limestone* Yegua Formation White River Group Yellow Aster Complex* Whitehill Formation Yellowjacket Formation Whitemud Formation Yellowknife Group Whitewater Formation Yeoman Formation Whitewater Group Yeso Formation Whitsett Formation Yezo Group Wichita Group Yixian Formation** Wicomico Formation York River Formation Wiggins Formation Yorktown Formation Wilberns Formation Younger Granites* Wilcox Formation* Yudoma Series Wilcox Group** Zabriskie Quartzite Wild Bight Group Zambales Ophiolite** Wild Cow Formation** Zhangxia Formation Wildcat Group** Zia Formation** Wilkins Peak Member Zubair Formation Williams Fork Formation Zuloaga Limestone
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