List R - Rock Units - Alphabetical List
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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 * Does not autopost. ** Partially autoposted. LIST R - ROCK UNITS - ALPHABETICAL LIST 3 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 * Does not autopost. ** Partially autoposted. 4 LIST R - ROCK UNITS - ALPHABETICAL LIST 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 * Does not