| Group or Formation
|
Period
|
Notes
|
| Admiral Formation |
Permian |
|
| Aguja Formation |
Cretaceous |
|
| Alacran Mountain Formation |
Permian |
|
| Albany Group/Lueders Formation |
Permian |
|
| Albany Group/Waggoner Ranch Formation |
Permian |
|
| Aleman Formation |
Ordovician |
|
| Altuda Formation |
Permian |
|
| Anacacho Limestone |
Cretaceous |
|
| Anahuac Formation |
Paleogene |
|
| Annona Chalk |
Cretaceous |
|
| Arcadia Park Shale |
Cretaceous |
|
| Archer City Formation |
Permian |
|
| Arroyo Formation |
Permian |
|
| Austin Formation |
Cretaceous |
|
| Austin Chalk |
Cretaceous |
|
| Austin Group/Atco Formation |
Cretaceous |
|
| Austin Group/Ector Formation |
Cretaceous |
|
| Austin Group/Ector Chalk |
Cretaceous |
|
| Austin Group/Gober Formation |
Cretaceous |
|
| Austin Group/Gober Chalk |
Cretaceous |
|
| Austin Group/Pflugerville Formation |
Cretaceous |
|
| Austin Group/Roxton Formation |
Cretaceous |
|
| Banta Shut Formation |
Neogene |
|
| Barnett Formation |
Carboniferous |
|
| Barnett Shale |
Carboniferous |
|
| Bead Mountain Formation |
Permian |
|
| Beaumont Formation |
Pleistocene |
|
| Bell Canyon Formation |
Permian |
|
| Belle Plains Formation |
Permian |
|
| Bend Group/Smithwick Formation |
Carboniferous |
|
| Benevides Formation |
Cretaceous |
|
| Bishop Cap Formation |
Carboniferous |
|
| Black Peaks Formation |
Paleogene |
|
| Blaine Formation |
Permian |
|
| Blanco Formation |
United States |
|
| Blossom Sand |
Cretaceous |
|
| Bone Spring Formation |
Permian |
|
| Bone Spring Limestone |
Permian |
|
| Boquillas Formation |
Cretaceous |
|
| Brad Formation |
Carboniferous |
|
| Bridwell Formation |
Neogene |
|
| Briggs Formation |
Permian |
|
| Brushy Canyon Formation |
Permian |
|
| Buda Limestone |
Cretaceous |
|
| Caballos Novaculite |
Late Devonian to Carboniferous (Mississippian) |
|
| Caddo Creek Formation |
Carboniferous |
|
| Camp Creek Formation |
Permian |
|
| Camp Rice Formation |
United States |
|
| Canoe Formation |
Paleogene |
|
| Canyon Group/Caddo Creek Formation |
Carboniferous |
|
| Canyon Group/Graford Formation |
Carboniferous |
|
| Canyon Group/Palo Pinto Formation |
Carboniferous |
|
| Canyon Group/Winchell Formation |
Carboniferous |
|
| Canyon Group/Wolf Mountain Formation |
Carboniferous |
|
| Canyon Group/Wolf Mountain Shale |
Carboniferous |
|
| Capitan Formation |
Permian |
|
| Capote Mountain Tuff |
Paleogene |
|
| Capps Formation |
Carboniferous |
|
| Catahoula Formation |
Paleogene |
|
| Cathedral Mountain Formation |
Permian |
|
| Cerro Alto Limestone |
Permian |
|
| Chaffin Formation |
Carboniferous |
|
| Chambers Tuff |
Paleogene |
|
| Chappel Limestone |
Carboniferous |
|
| Cherry Canyon Formation |
Permian |
|
| Chinle Group/Dockum Group |
Triassic |
|
| Chinle Group/Tecovas Formation |
Triassic |
|
| Chisos Formation |
Paleogene |
|
| Chispa Summit Formation |
Cretaceous |
|
| Cibolo Formation |
Permian |
|
| Cisco Group/Bluff Creek Formation |
Carboniferous |
|
| Cisco Group/Graham Formation |
Carboniferous |
|
| Cisco Group/Pueblo Formation |
Permian |
|
| Cisco Group/Putnam Formation |
Permian |
|
| Claiborne Formation |
Paleogene |
|
| Claiborne Group/Cook Mountain Formation |
Paleogene |
|
| Claiborne Group/Crockett Formation |
Paleogene |
|
| Claiborne Group/Reklaw Formation |
Paleogene |
|
| Claiborne Group/Stone City Formation |
Paleogene |
|
| Claiborne Group/Weches Formation |
Paleogene |
|
| Clarendon Beds |
Neogene |
|
| Clear Fork Formation |
Permian |
|
| Clear Fork Group/Arroyo Formation |
Permian |
|
| Clear Fork Group/Vale Formation |
Permian |
|
| Clear Fork Group/Choza Formation |
Permian |
|
| Clear Fork Group/Lueders Formation |
Permian |
|
| Clear Fork Group/Vale Formation |
Permian |
|
| Clyde Formation |
Permian |
|
| Coetas Formation |
Neogene |
|
| Coleman Junction Formation |
Permian |
|
| Colmena Tuff |
Paleogene |
|
| Comanche Formation |
Cretaceous |
|
| Comanche Peak Limestone |
Cretaceous |
|
| Comanche Group/Paw Paw Formation |
Cretaceous |
|
| Concha Formation |
Permian |
|
| Cook Mountain Formation |
Paleogene |
|
| Corsicana Marl |
Cretaceous |
|
| Cow Creek Limestone (Cow Creek Formation) |
Cretaceous |
|
| Crockett Formation |
Paleogene |
|
| Cutoff Formation |
Permian |
|
| Cutter Dolomite |
Ordovician |
|
| Del Rio Clay |
Cretaceous |
|
| Delaho Formation |
Neogene |
|
| Delaware Mountain Formation |
Permian |
|
| Denton Formation |
Cretaceous |
|
| Devil's Graveyard Formation |
Paleogene |
|
| Devils River Limestone |
Cretaceous |
|
| Dockum Formation |
Triassic |
|
| Dockum Group/Camp Springs Formation |
Triassic |
|
| Dockum Group/Colorado City Formation |
Triassic |
|
| Dockum Group/Cooper Canyon Formation |
Triassic |
|
| Dockum Group/Santa Rosa Sandstone |
Triassic |
|
| Dockum Group/Tecovas Formation |
Triassic |
|
| Dockum Group/Trujillo Formation |
Triassic |
|
| Dog Creek Formation |
Permian |
|
| Eagle Ford Formation |
Cretaceous |
|
| Eagle Ford Group/Britton Formation |
Cretaceous |
|
| Eagle Ford Shale |
Cretaceous |
|
| Eagle Ford Group/Britton Formation |
Cretaceous |
|
| Eagle Ford Group/Lake Waco Formation |
Cretaceous |
|
| Eagle Ford Group/Tarrant Formation |
Cretaceous |
|
| East Mountain Shale |
Carboniferous |
|
| Edwards Limestone |
Cretaceous |
|
| Edwards Group/Segovia Formation |
Cretaceous |
|
| El Paso Formation |
Ordovician |
|
| El Paso Group/Florida Formation |
Ordovician |
|
| El Paso Group/McKelligon Canyon Formation |
Ordovician |
|
| El Paso Group/Padre Formation |
Ordovician |
|
| El Paso Group/Scenic Drive Formation |
Ordovician |
|
| El Picacho Formation |
Cretaceous |
|
| Ellenburger Group |
Ordovician |
|
| Ellenburger Group/Honeycut Formation |
Ordovician |
|
| Ellenburger Group/Tanyard Formation |
Ordovician |
|
| Escondido Formation |
Cretaceous |
|
| Fayette Sandstone |
Paleogene |
|
| Fleming Formation |
Neogene |
|
| Fort Hancock Formation |
Pleistocene |
|
| Fort Peña Formation |
Ordovician |
|
| Fort Worth Limestone |
Cretaceous |
|
| Fredericksburg Group/Comanche Peak Limestone |
Cretaceous |
|
| Fredericksburg Group/Edwards Limestone |
Cretaceous |
|
| Fredericksburg Group/Goodland Formation |
Cretaceous |
|
| Fredericksburg Group/Stuart City Formation |
Cretaceous |
|
| Fredericksburg Group/Walnut Formation |
Cretaceous |
|
| Fredericksburg Group/Glen Rose Limestone |
Cretaceous |
|
| Fredericksburg Group/Paluxy Formation |
Cretaceous |
|
| Gaptank Formation |
Carboniferous |
|
| Glen Rose Formation |
Cretaceous |
|
| Goliad Formation |
Neogene |
|
| Goodland Limestone |
Cretaceous |
|
| Goodnight Beds |
Neogene |
|
| Gorman Formation |
Ordovician |
|
| Graford Formation |
Carboniferous |
|
| Graham Formation |
Carboniferous |
|
| Graham Group/Gunsight Formation |
United States |
|
| Graham Group/Jacksboro Limestone |
Carboniferous |
|
| Graham Group/Wayland Formation |
United States |
|
| Grayson Formation |
Cretaceous |
|
| Grayson Marl |
Cretaceous |
|
| Gulf Group/Woodbine Formation |
Cretaceous |
|
| Hammett Formation |
Cretaceous |
|
| Hammett Shale |
Cretaceous |
|
| Hannold Hill Formation |
Paleogene |
|
| Harpersville Formation |
Carboniferous |
|
| Helms Formation |
Carboniferous |
|
| Hess Formation |
Permian |
|
| Hogeye Tuff |
Paleogene |
|
| Honeycut Formation |
Ordovician |
|
| Houy Formation |
Devonian to Carboniferous (Mississippian) |
|
| Hueco Formation |
Permian |
|
| Hueco Canyon Formation |
Permian |
|
| Jackson Formation |
Paleogene |
|
| Jackson Group/Wellborn Formation |
Paleogene |
|
| Javelina Formation |
Cretaceous |
|
| Kamp Ranch Limestone |
Cretaceous |
|
| Kemp Clay |
Cretaceous |
|
| Keys Valley Marl Member |
Cretaceous |
|
| Kiamichi Shale (Kiamichi Formation) |
Cretaceous |
|
| Kincaid Formation |
Paleogene |
|
| Lake Waco Formation |
Cretaceous |
|
| Laredo Formation |
Paleogene |
|
| Lazy Bend Formation |
Carboniferous |
|
| Lenox Hills Formation |
Permian |
|
| Lone Camp Group/East Mountain Formation |
Carboniferous |
|
| Love Formation |
United States |
|
| Lueders Formation |
Permian |
|
| Magdalen Limestone |
Carboniferous |
|
| Magdalena Formation |
Carboniferous to Permian (?) |
|
| Main Street Limestone |
Cretaceous |
|
| Malone Formation |
Late Jurassic |
|
| Mancos Shale |
Cretaceous |
|
| Marathon Formation |
Ordovician |
|
| Marble Falls Formation |
Carboniferous |
|
| Midway Formation |
Paleogene |
|
| Midway Group/Anacacho Limestone |
Cretaceous |
|
| Midway Group/Kincaid Formation |
Paleogene |
|
| Midway Group/Shark River Formation |
Paleogene |
|
| Midway Group/Wills Point Formation |
Paleogene |
|
| Millsap Lake Group/Lazy Bend Formation |
Carboniferous |
|
| Mineral Wells Formation |
Carboniferous |
|
| Mingus Formation |
Carboniferous |
|
| Montoya Group |
Ordovician |
|
| Montoya Group/Aleman Formation |
Ordovician |
|
| Montoya Group/Cutter Formation |
Ordovician |
|
| Montoya Group/Second Value Formation |
Ordovician |
|
| Moore Hollow Group/Wilberns Formation |
Cambrian |
|
| Moran Formation |
Permian |
|
| Nacatoch Sand |
Cretaceous |
|
| Navarro Formation |
Cretaceous |
|
| Navarro Group/Kemp Clay |
Cretaceous |
|
| Navarro Group/Neylandville Marl |
Cretaceous |
|
| Neal Ranch Formation |
Early Permian |
|
| Neylandville Marl |
Cretaceous |
|
| Oakville Formation |
Neogene |
|
| Obregon Formation |
Carboniferous |
|
| Ogallala Formation |
Neogene |
|
| Ojinaga Formation |
Cretaceous |
|
| Ozan Formation |
Cretaceous |
|
| Paluxy Formation |
Cretaceous |
|
| Pease River Group/San Angelo Formation |
Permian |
|
| Pease River Group/San Angelo Group/Blaine Formation |
Permian |
|
| Pecan Gap Chalk |
Cretaceous |
|
| Pen Formation |
Cretaceous |
|
| Pepper Shale |
Cretaceous |
|
| Pillar Bluff Limestone |
Devonian |
|
| Pruett Formation |
Paleogene |
|
| Pueblo Formation |
Carboniferous |
|
| Putnam Formation |
Permian |
|
| Quartermaster Formation |
Permian |
|
| Rawls Formation |
Neogene |
|
| Reklaw Formation |
Paleogene |
|
| Riley Formation |
Cambrian |
|
| Rita Blanca Formation |
Pleistocene |
|
| Road Canyon Formation |
Permian |
|
| Ross Mine Formation |
Permian |
|
| Rustler Formation |
Permian |
|
| Sabinetown Bluff Formation |
Paleogene |
|
| Salesville Formation |
Carboniferous |
|
| San Andres Formation |
Permian |
|
| San Carlos Formation |
Cretaceous |
|
| Second Value Dolomite |
Ordovician |
|
| Sedwick Formation |
Permian |
|
| Seguin Formation |
Paleogene |
|
| Selman Formation |
Paleogene |
|
| Seymour Formation |
Pleistocene |
|
| Shuler Formation |
Late Jurassic |
|
| Skinner Mountain Formation |
Permian |
|
| Skinner Ranch Formation |
Permian |
|
| Sligo Formation |
Cretaceous |
|
| Smithwick Formation |
Carboniferous |
|
| Starcke Limestone |
Silurian |
|
| Stone City Formation |
Paleogene |
|
| Strawn Formation |
Carboniferous |
|
| Strawn Group/Grindstone Formation |
Carboniferous |
|
| Strawn Group/Millsap Lake Formation |
Carboniferous |
|
| Sullivan Peak Formation |
Permian |
|
| Tahoka Formation |
Pleistocene |
|
| Talpa Formation |
Permian |
|
| Tanyard Formation |
Ordovician |
|
| Taylor Marl |
Cretaceous |
|
| Taylor Group/Sprinkle Formation |
Cretaceous |
|
| Taylor Group/Wolfe City Formation |
Cretaceous |
|
| Taylor Group/Wolfe City Group/Sprinkle Formation |
Cretaceous |
|
| Tecovas Formation |
Triassic |
|
| Tesnus Formation |
Carboniferous |
|
| Thrifty Formation |
Carboniferous |
|
| Torcer Formation |
Cretaceous |
|
| Tornillo Formation |
Paleogene, Cretaceous |
|
| Tornillo Group/Javelina Formation |
Cretaceous |
|
| Travis Peak Formation |
Cretaceous |
|
| Trinity Formation |
Cretaceous |
|
| Trinity Group/Antlers Formation |
Cretaceous |
|
| Trinity Group/Bluff Mesa Formation |
Cretaceous |
|
| Trinity Group/Cuchillo Formation |
Cretaceous |
|
| Trinity Group/Glen Rose Formation |
Cretaceous |
|
| Trinity Group/Glen Rose Group/Paluxy Formation |
Cretaceous |
|
| Trinity Group/Hensel Sand |
Cretaceous |
|
| Trinity Group/Paluxy Formation |
Cretaceous |
|
| Trinity Group/Twin Mountains Formation |
Cretaceous |
|
| Tule Formation |
Pleistocene |
|
| Twin Mountains Formation |
Cretaceous |
|
| Vale Formation |
Permian |
|
| Valera Shale |
Permian |
|
| Vidrio Formation |
Permian |
|
| Vieja Formation |
Paleogene |
|
| Waggoner Ranch Formation |
Permian |
|
| Waldrip Formation |
Carboniferous |
|
| Walnut Formation |
Cretaceous |
|
| Washita Formation |
Cretaceous |
|
| Washita Group/Del Rio Formation |
Cretaceous |
|
| Washita Group/Denison Formation |
Cretaceous |
|
| Washita Group/Denton Formation |
Cretaceous |
|
| Washita Group/Duck Creek Formation |
Cretaceous |
|
| Washita Group/Fort Worth Formation |
Cretaceous |
|
| Washita Group/Grayson Marl |
Cretaceous |
|
| Washita Group/Main Street Limestone |
Cretaceous |
|
| Washita Group/Pawpaw Formation |
Cretaceous |
|
| Washita Group/Weno Limestone |
Cretaceous |
|
|
| Weches Formation |
Paleogene |
|
| Weno Formation |
Cretaceous |
|
| Whitehorse Formation |
Permian |
|
| Wichita Formation |
Permian |
|
| Wichita Group/Admiral Formation |
Permian |
|
| Wichita Group/Archer City Formation |
Permian |
|
| Wichita Group/Belle Plains Formation |
Permian |
|
| Wichita Group/Clyde Formation |
Permian |
|
| Wichita Group/Lueders Formation |
Permian |
|
| Wichita Group/Moran Formation |
Permian |
|
| Wichita Group/Nocona Formation |
Permian |
|
| Wichita Group/Petrolia Formation |
Permian |
|
| Wichita Group/Waggoner Ranch Formation |
Permian |
|
| Wichita Group/Putnam Formation |
Permian |
|
| Wichita Group/Waggoner Ranch Formation |
Permian |
|
| Wilberns Formation |
Cambrian |
|
| Wilcox Group/Rockdale Formation |
Paleogene |
|
| Wills Point Formation |
Paleogene |
|
| Winchell Formation |
Carboniferous |
|
| Wolf Mountain Formation |
Carboniferous |
|
| Wolfe City Formation |
Cretaceous |
|
| Woodbine Formation |
Cretaceous |
|
| Woods Hollow Formation |
Middle Ordovician |
|
| Word Formation |
Permian |
|
| Yegua Formation |
Paleogene |
|
| Yucca Formation |
Cretaceous |
|
