Geologic units in Texas (state in United States)

Additional scientific data in this geographic area

Blackwater Draw Formation (Pleistocene) at surface, covers 9 % of this area

Blackwater Draw Formation

Alluvium (Holocene) at surface, covers 7 % of this area

Alluvium

Edwards Limestone (Early Cretaceous) at surface, covers 6 % of this area

Edwards Limestone

Sand sheet deposits (Holocene) at surface, covers 4 % of this area

Sand sheet deposits

Ogallala Formation (Pliocene to Miocene) at surface, covers 4 % of this area

Ogallala Formation

Quaternary deposit, undivided (Quaternary) at surface, covers 3 % of this area

Quaternary deposit, undivided

Terrace deposits (Pleistocene and Holocene) at surface, covers 3 % of this area

Terrace deposits

Queen City Sand (Eocene) at surface, covers 2 % of this area

Queen City Sand

Beaumont Formation, areas predominantly sand (Quaternary; Late Pleistocene) at surface, covers 2 % of this area

Beaumont Formation, areas predominantly sand

Lissie Formation (Quaternary; Middle Pleistocene) at surface, covers 2 % of this area

Lissie Formation

Beaumont Formation, areas predominantly clay (Quaternary; Late Pleistocene) at surface, covers 2 % of this area

Beaumont Formation, areas predominantly clay

Wilcox Group, undivided (Paleocene to Eocene) at surface, covers 2 % of this area

Wilcox Group, undivided

Glen Rose Limestone (Early Cretaceous) at surface, covers 2 % of this area

Glen Rose Limestone

Goliad Formation (Miocene) at surface, covers 2 % of this area

Goliad Formation

Yegua Formation (Middle Eocene) at surface, covers 1 % of this area

Yegua Formation

Whitehorse Group, undivided (Permian; Guadalupe Series) at surface, covers 1 % of this area

Whitehorse Group, undivided

Blaine Formation (Permian; Guadalupe Series) at surface, covers 1 % of this area

Blaine Formation

Clear Fork Group (Permian; Leonard Series) at surface, covers 1 % of this area

Clear Fork Group

Fleming Formation (Miocene) at surface, covers 1 % of this area

Fleming Formation

Willis Formation (Pliocene) at surface, covers 1 % of this area

Willis Formation

Dockum Group, undivided (Late Triassic) at surface, covers 1 % of this area

Dockum Group

Austin Chalk (Late Cretaceous; Gulfian Series) at surface, covers 1.0 % of this area

Austin Chalk

Alluvial fan deposits (Pleistocene and Holocene) at surface, covers 1.0 % of this area

Alluvial fan deposits

Older alluvial deposits (Pleistocene) at surface, covers 0.9 % of this area

Older alluvial deposits

Dune sand sheet deposits (Holocene) at surface, covers 0.9 % of this area

Dune sand sheet deposits

Walnut Clay (Early Cretaceous) at surface, covers 0.9 % of this area

Walnut Clay

Antlers Sand (Early Cretaceous) at surface, covers 0.9 % of this area

Antlers Sand

Buda Limestone (Early Cretaceous) at surface, covers 0.8 % of this area

Buda Limestone; Eastern part of Trans-Pecos and High Plains and Western part of Trans-Pecos and North, central, and south Texas including Quaternary for all of west Texas.

Carizzo Sand (Eocene) at surface, covers 0.7 % of this area

Carizzo Sand

Reklaw Formation (Eocene) at surface, covers 0.7 % of this area

Reklaw Formation

Sparta Sand (Eocene) at surface, covers 0.7 % of this area

Sparta Sand

Cook Mountain Formation (Eocene) at surface, covers 0.7 % of this area

Cook Mountain Formation

Quartermaster Formation (Permian; Guadalupe Series) at surface, covers 0.6 % of this area

Quartermaster Formation; North and central Texas including panhandle.

Catahoula Formation (Oligocene) at surface, covers 0.6 % of this area

Catahoula Formation

Laredo Formation (Middle Eocene) at surface, covers 0.6 % of this area

Laredo Formation

Ozan Formation (Late Cretaceous; Gulfian Series) at surface, covers 0.6 % of this area

Ozan Formation

Eagle Ford Formation (Late Cretaceous) at surface, covers 0.6 % of this area

Eagle Ford Formation

Thrifty and Graham Formations, undivided (Late Pennsylvanian; Virgil Series) at surface, covers 0.5 % of this area

Thrifty and Graham Formations, undivided

Sand deposits, undivided (Holocene) at surface, covers 0.5 % of this area

Sand deposits, undivided

Leona Formation (Pleistocene) at surface, covers 0.5 % of this area

Leona Formation

Devils River Limestone (Early Cretaceous; Comanchean Series) at surface, covers 0.5 % of this area

Devils River Limestone

Jackson Group, undivided (Oligocene and Eocene) at surface, covers 0.5 % of this area

Jackson Group, undivided

Uvalde Gravel (Pliocene to Pleistocene) at surface, covers 0.5 % of this area

Uvalde Gravel

Woodbine Formation (Late Cretaceous; Gulfian Series) at surface, covers 0.5 % of this area

Woodbine Formation

El Pico Clay (Eocene) at surface, covers 0.5 % of this area

El Pico Clay

Paluxy Sand (Early Cretaceous) at surface, covers 0.5 % of this area

Paluxy Sand

Caliche deposits (Pleistocene and Holocene) at surface, covers 0.5 % of this area

Caliche deposits

Paluxy Sand and Glen Rose Limestone, undivided (Early Cretaceous) at surface, covers 0.4 % of this area

Paluxy Sand and Glen Rose Limestone, undivided

Weches Formation (Eocene) at surface, covers 0.4 % of this area

Weches Formation

Lingos Formation (Middle (?) Pleistocene to Recent) at surface, covers 0.4 % of this area

Lingos Formation

Bouquillas Formation (Late Cretaceous) at surface, covers 0.4 % of this area

Bouquillas Formation

Twin Mountains Formation (Early Cretaceous) at surface, covers 0.4 % of this area

Twin Mountains Formation

Calvert Bluff Formation (Paleocene to Eocene) at surface, covers 0.4 % of this area

Calvert Bluff Formation

Midway Group, undivided (Paleocene) at surface, covers 0.4 % of this area

Midway Group, undivided

Santa Elena Limestone (Early Cretaceous) at surface, covers 0.4 % of this area

Santa Elena Limestone

Markley Formation (Pennsylvanian to Early Permian) at surface, covers 0.3 % of this area

Markley Formation

Archer City Formation (Permian; Wolfcamp Series) at surface, covers 0.3 % of this area

Archer City Formation

Undivided part Fredericksberg Group (Early Cretaceous) at surface, covers 0.3 % of this area

Undivided part Fredericksberg Group

Wills Point Formation (Paleocene) at surface, covers 0.3 % of this area

Wills Point Formation

Oakville Sandstone (Miocene) at surface, covers 0.3 % of this area

Oakville Sandstone

Lueders Formation (Permian; Leonard Series) at surface, covers 0.3 % of this area

Lueders Formation

Quartermaster Formation and Whitehorse Group, undivided (Permian; Guadalupe Series) at surface, covers 0.3 % of this area

Quartermaster Formation and Whitehorse Group, undivided

Older volcanic rocks of Davis and Barilla Mountains, including Sheep Pasture, Sleeping Lion, Frazier Canyon, Adobe Canyon, and Limpia formations, Gomez Tuff, Star Mountain Rhyolite, and Huelster Formation (Late Eocene) at surface, covers 0.3 % of this area

Older volcanic rocks of Davis and Barilla Mountains, including Sheep Pasture, Sleeping Lion, Frazier Canyon, Adobe Canyon, and Limpia formations, Gomez Tuff, Star Mountain Rhyolite, and Huelster Formation

Nocona Formation (Permian; Wolfcamp and Leonard Series) at surface, covers 0.3 % of this area

Nocona Formation

Hensell Sand (Early Cretaceous; Comanchean Series) at surface, covers 0.3 % of this area

Hensell Sand

Seymour Formation (Middle Pleistocene; Irvingtonian) at surface, covers 0.3 % of this area

Seymour Formation

Salmon Peak Limestone (Early Cretaceous) at surface, covers 0.3 % of this area

Salmon Peak Limestone

Manning Formation (Eocene) at surface, covers 0.3 % of this area

Manning Formation

Petrolia Formation (Permian; Wolfcamp to Leonard Series) at surface, covers 0.3 % of this area

Petrolia Formation

Strawn Group (Middle Pennsylvanian; Atoka and Des Moines Series) at surface, covers 0.3 % of this area

Strawn Group

Tecovas Formation (Late Triassic) at surface, covers 0.3 % of this area

Tecovas Formation

Perdiz Conglomerate, Tascotal Formation, and tuffaceous sediments of Fresno Formation (Oligocene) at surface, covers 0.3 % of this area

Perdiz Conglomerate, Tascotal Formation, and tuffaceous sediments of Fresno Formation

Salado and Castile Formations, undivided (Permian; Ochoa Series) at surface, covers 0.3 % of this area

Salado and Castile Formations, undivided

Wolfe City Formation (Late Cretaceous; Gulfian Series) at surface, covers 0.2 % of this area

Wolfe City Formation

Whitsett Formation (Oligocene and Eocene) at surface, covers 0.2 % of this area

Whitsett Formation

Grayson Marl and Main Street Limestone, undivided (Early Late Cretaceous and Late Early Cretaceous) at surface, covers 0.2 % of this area

Grayson Marl and Main Street Limestone, undivided

Fleming Formation and Oakville Sandstone, undivided (Miocene) at surface, covers 0.2 % of this area

Fleming Formation and Oakville Sandstone, undivided

Fort Worth Limestone and Duck Creek Formation, undivided (Early Cretaceous) at surface, covers 0.2 % of this area

Fort Worth Limestone and Duck Creek Formation, undivided

Silt sheet (Holocene) at surface, covers 0.2 % of this area

Silt sheet

Marlbrook Marl (Late Cretaceous; Gulfian Series) at surface, covers 0.2 % of this area

Marlbrook Marl

Deweyville Formation (Quaternary; Pleistocene and Holocene?) at surface, covers 0.2 % of this area

Deweyville Formation

Neylandville and Marlbrook Marls, undivided (Late Cretaceous; Gulfian Series) at surface, covers 0.2 % of this area

Neylandville and Marlbrook Marls, undivided

Quaternary-Tertiary bolson deposits (Pliocene to Pleistocene) at surface, covers 0.2 % of this area

Quaternary-Tertiary bolson deposits

Buda Limestone and Del Rio Clay, undivided (Late Cretaceous) at surface, covers 0.2 % of this area

Buda Limestone and Del Rio Clay, undivided; Eastern part of Trans-Pecos and High Plains and Western part of Trans-Pecos and North, central, and south Texas including Quaternary for all of west Texas.

High gravel deposits (Pleistocene) at surface, covers 0.2 % of this area

High gravel deposits

San Angelo Formation (Permian; Guadalupe Series) at surface, covers 0.2 % of this area

San Angelo Formation

Pecan Gap Chalk (Late Cretaceous; Gulfian Series) at surface, covers 0.2 % of this area

Pecan Gap Chalk

Navarro Group and Marlbrook Marl, undivided (Late Cretaceous; Gulfian Series) at surface, covers 0.2 % of this area

Navarro Group and Marlbrook Marl, undivided

Fredericksburg Group (Early Cretaceous; Comanchean Series) at surface, covers 0.2 % of this area

Fredericksburg Group

Washita Group (Early and Late Cretaceous; Comanchean Series) at surface, covers 0.2 % of this area

Washita Group

Cadell Formation (Eocene) at surface, covers 0.2 % of this area

Cadell Formation

Kincaid Formation (Paleocene) at surface, covers 0.2 % of this area

Kincaid Formation

Bigford Formation (Eocene) at surface, covers 0.2 % of this area

Bigford Formation

Hueco Limestone (Permian; Wolfcamp Series) at surface, covers 0.2 % of this area

Hueco Limestone

Bolson deposits (Pleistocene and Holocene) at surface, covers 0.2 % of this area

Bolson deposits

Hooper Formation (Paleocene) at surface, covers 0.2 % of this area

Hooper Formation

Bonham Formation (Late Cretaceous; Gulfian Series) at surface, covers 0.2 % of this area

Bonham Formation

Tanyard Formation (Early Ordovician) at surface, covers 0.2 % of this area

Tanyard Formation

Waggoner Ranch Formation (Permian; Leonard Series) at surface, covers 0.2 % of this area

Waggoner Ranch Formation

Jagger Bend and Valera Formations, undivided (Permian; Leonard Series) at surface, covers 0.2 % of this area

Jagger Bend and Valera Formations, undivided

Goodland Limestone and Walnut Clay, undivided (Early Cretaceous; Comanchean Series) at surface, covers 0.2 % of this area

Goodland Limestone and Walnut Clay, undivided

Bead Mountain Formation (Permian; Leonard Series) at surface, covers 0.2 % of this area

Bead Mountain Formation

Escondido Formation (Late Cretaceous; Gulfian Series) at surface, covers 0.2 % of this area

Escondido Formation

Alluvium in Rio Grande, subdivided into areas predominantly of sand (Quaternary; Holocene) at surface, covers 0.2 % of this area

Alluvium in Rio Grande, subdivided into areas predominantly of sand

Duff Formation (with Decie Member from Paisano caldera shown separately), Cottonwood Springs Basalt, Potato Hill Andesite, Sheep Canyon Basalt, Crossen Trachyte, and Pruett Formation, undivided (Late Eocene to Early Oligocene) at surface, covers 0.2 % of this area

Duff Formation (with Decie Member from Paisano caldera shown separaetly), Cottonwood Springs Basalt, Potato Hill Andesite, Sheep Canyon Basalt, Crossen Trachyte, and Pruett Formation, undivided

Bofecillos volcano volcanic rocks, including units 1-8 of Rawls Formation and lava flows in upper part of Fresno Formation (Oligocene) at surface, covers 0.1 % of this area

Bofecillos volcano volcanic rocks, including units 1-8 of Rawls Formation and lava flows in upper part of Fresno Formation

Valley Spring Gneiss (preCambrian (Proterozoic)) at surface, covers 0.1 % of this area

Valley Spring Gneiss

Town Mountain Granite (preCambrian (Proterozoic)) at surface, covers 0.1 % of this area

Town Mountain Granite

Harpersville Formation (Pennsylvanian; Virgil Series) at surface, covers 0.1 % of this area

Harpersville Formation

Trujillo Formation (Late Triassic) at surface, covers 0.1 % of this area

Trujillo Formation

Barrier island deposits (Quaternary) at surface, covers 0.1 % of this area

Barrier island deposits

Victorio Peak Formation (Permian; Leonard Series) at surface, covers 0.1 % of this area

Victorio Peak Formation

Travis Peak Formation (Early Cretaceous) at surface, covers 0.1 % of this area

Travis Peak Formation

Lower part of Washita Group (Early Cretaceous; Comanchean Series) at surface, covers 0.1 % of this area

Lower part of Washita Group

Grape Creek Formation (Permian; Leonard Series) at surface, covers 0.1 % of this area

Grape Creek Formation

Talpa Formation (Permian; Leonard Series) at surface, covers 0.1 % of this area

Talpa Formation

Admiral Formation (Permian; Wolfcamp Series) at surface, covers 0.1 % of this area

Admiral Formation

Gorman Formation (Early Ordovician) at surface, covers 0.1 % of this area

Gorman Formation

Pawpaw Formation, Weno Limestone, and Denton Clay, undivided (Early Cretaceous) at surface, covers 0.1 % of this area

Pawpaw Formation, Weno Limestone, and Denton Clay, undivided

Gober Chalk and Roxton Limestone (Late Cretaceous; Gulfian Series) at surface, covers 0.1 % of this area

Gober Chalk and Roxton Limestone

Alluvium in Rio Grande, subdivided into areas predominantly of clay (Quaternary; Holocene) at surface, covers 0.1 % of this area

Alluvium in Rio Grande, subdivided into areas predominantly of clay

Home Creek Limestone and Colony Creek Shale, undivided (Pennsylvanian; Missouri Series) at surface, covers 0.1 % of this area

Home Creek Limestone and Colony Creek Shale, undivided

Packsaddle Schist (preCambrian (Proterozoic); Llano Series) at surface, covers 0.1 % of this area

Packsaddle Schist

Finlay Limestone (Early Cretaceous; Comanchean; Albian Series) at surface, covers 0.1 % of this area

Finlay Limestone

Navarro and Taylor Groups, undivided (Late Cretaceous; Gulfian Series) at surface, covers 0.1 % of this area

Navarro and Taylor Groups, undivided

Simsboro Formation (Paleocene) at surface, covers 0.1 % of this area

Simsboro Formation

Pueblo Formation (Permian; Wolfcamp Series) at surface, covers 0.1 % of this area

Pueblo Formation

Chinati Mountains caldera volcanic rocks, including Chinati Mountains Group, Mitchell Mesa Ignimbrite, and type area of Petan Basalt (Oligocene) at surface, covers 0.1 % of this area

Chinati Mountains caldera volcanic rocks, including Chinati Mountains Group, Mitchell Mesa Ignimbrite, and type area of Petan Basalt

Playa deposits (Pleistocene and Holocene) at surface, covers 0.1 % of this area

Playa deposits

Ranger Limestone and Placid Creek Shale, undivided (Pennsylvanian; Missouri Series) at surface, covers 0.1 % of this area

Ranger Limestone and Placid Creek Shale, undivided

Bell Canyon Formation (Permian; Guadalupe Series) at surface, covers 0.1 % of this area

Bell Canyon Formation

Hickory Sandstone Member (Middle Cambrian) at surface, covers 0.1 % of this area

Hickory Sandstone Member

Younger volcanic rocks of Davis Mountains area including Brooks Mountain, Goat Canyon, Medley, Barrel Springs, Wild Cherry, Eppenaurer Ranch, Mount Locke, and Merrill Formations (Early Oligocene) at surface, covers 0.1 % of this area

Younger volcanic rocks of Davis Mountains area including Brooks Mountain, Goat Canyon, Medley, Barrel Springs, Wild Cherry, Eppenaurer Ranch, Mount Locke, and Merrill Formations

Wellborn Formation (Eocene) at surface, covers 0.1 % of this area

Wellborn Formation

Tahoka Formation (Pleistocene; Wisconsinan) at surface, covers 0.1 % of this area

Tahoka Formation

Indio Formation (Paleocene to Eocene) at surface, covers 0.1 % of this area

Indio Formation

Elm Creek Formation (Permian; Leonard Series) at surface, covers 0.1 % of this area

Elm Creek Formation

Rustler Formation (Permian; Ochoa Series) at surface, covers 0.1 % of this area

Rustler Formation

Undivided parts of Washita and Fredericksberg Groups (Early Cretaceous) at surface, covers 0.1 % of this area

Undivided parts of Washita and Fredericksberg Groups

Cherry Canyon Formation (Permian; Guadalupe Series) at surface, covers 0.1 % of this area

Cherry Canyon Formation

Nacatoch Sand (Late Cretaceous; Gulfian Series) at surface, covers 0.1 % of this area

Nacatoch Sand

Undivided part of Washita Group (Early Cretaceous; Comanchean Series) at surface, covers 0.1 % of this area

Undivided part of Washita Group

Navarro Group, undivided (Late Cretaceous; Gulfian Series) at surface, covers 0.1 % of this area

Navarro Group, undivided

Edwards and Comanche Peak Limestones, undivided (Early Cretaceous) at surface, covers 0.1 % of this area

Edwards and Comanche Peak Limestones, undivided

Santa Anna Branch Shale (Permian; Wolfcamp Series) at surface, covers < 0.1 % of this area

Santa Anna Branch Shale

Catahoula Formation and Frio Clay, undivided (Oligocene) at surface, covers < 0.1 % of this area

Catahoula Formation and Frio Clay, undivided

Maxon Sandstone and Glen Rose Limestone, undivided (Early Cretaceous) at surface, covers < 0.1 % of this area

Maxon Sandstone and Glen Rose Limestone, undivided

Vieja Group, including Bracks Rhyolite, Chambers and Colmena Tuffs and Gill Breccia (Eocene to Oligocene) at surface, covers < 0.1 % of this area

Vieja Group, including Bracks Rhyolite, Chambers and Colmena Tuffs and Gill Breccia

Kiamichi Formation (Early Cretaceous; Comanchean Series) at surface, covers < 0.1 % of this area

Kiamichi Formation

Mineral Wells Formation (Pennsylvanian; Missouri Series) at surface, covers < 0.1 % of this area

Mineral Wells Formation

Barrier ridge and barrier flat deposts (Quaternary; Holocene) at surface, covers < 0.1 % of this area

Barrier ridge and barrier flat deposts

Winchell Limestone (Pennsylvanian; Missouri Series) at surface, covers < 0.1 % of this area

Winchell Limestone

Tesnus Formation (Early Pennsylvanian and Late Mississippian) at surface, covers < 0.1 % of this area

Tesnus Formation

Cox Sandstone (Early Cretaceous) at surface, covers < 0.1 % of this area

Cox Sandstone

Moran Formation (Permian; Wolfcamp Series) at surface, covers < 0.1 % of this area

Moran Formation

Oligocene intrusive rocks (Oligocene) at surface, covers < 0.1 % of this area

Oligocene intrusive rocks

Palo Pinto Formation (Pennsylvanian; Missouri Series) at surface, covers < 0.1 % of this area

Palo Pinto Formation

Wilberns Formation showing San Saba Member (Late Cambrian) at surface, covers < 0.1 % of this area

Wilberns Formation showing San Saba Member

Capitan Formation (Permian; Guadalupe Series) at surface, covers < 0.1 % of this area

Capitan Formation

Aguja Formation (Late Cretaceous) at surface, covers < 0.1 % of this area

Aguja Formation

Marble Falls Limestone (Pennsylvanian; Morrow Series) at surface, covers < 0.1 % of this area

Marble Falls Limestone

Quaternary-Tertiary deposits, undivided (Pliocene to Pleistocene) at surface, covers < 0.1 % of this area

Quaternary-Tertiary deposits, undivided

Manning, Wellborn, and Cadell Formations, undivided (Eocene) at surface, covers < 0.1 % of this area

Manning, Wellborn, and Cadell Formations, undivided

Kemp clay and Corsicana Marl, undivided (Late Cretaceous; Gulfian Series) at surface, covers < 0.1 % of this area

Kemp clay and Corsicana Marl, undivided

Frio Clay (Oligocene) at surface, covers < 0.1 % of this area

Frio Clay

Chisos Formation of Schiebout et al (1987) and the Big Yellow Sandstone Member of their Tornillo Formation, undivided (Eocene to Oligocene) at surface, covers < 0.1 % of this area

Chisos Formation of Schiebout et al (1987) and the Big Yellow Sandstone Member of their Tornillo Formation, undivided

Santa Anna Branch Shale and Sedwick and Moran Formations, undivided (Permian; Wolfcamp Series) at surface, covers < 0.1 % of this area

Santa Anna Branch Shale and Sedwick and Moran Formations, undivided

Riley Formation showing Lion Mountain Sandstone and Cap Mountain Limestone Members, undivided (Middle Cambrian) at surface, covers < 0.1 % of this area

Riley Formation showing Lion Mountain Sandstone and Cap Mountain Limestone Members, undivided

Land slide deposits (Pleistocene and Holocene) at surface, covers < 0.1 % of this area

Land slide deposits

Wolf Mountain Shale (Pennsylvanian; Missouri Series) at surface, covers < 0.1 % of this area

Wolf Mountain Shale

Wilberns Formation showing Point Peak, Morgan Creek Limestone, and Welge Sandstone Members, undivided (Late Cambrian) at surface, covers < 0.1 % of this area

Wilberns Formation showing Point Peak, Morgan Creek Limestone, and Welge Sandstone Members, undivided

Brazos River Formation (Pennsylvanian; Des Moines Series) at surface, covers < 0.1 % of this area

Brazos River Formation

Blossom Sand (Late Cretaceous; Gulfian Series) at surface, covers < 0.1 % of this area

Blossom Sand

Anacacho Limestone (Late Cretaceous; Gulfian Series) at surface, covers < 0.1 % of this area

Anacacho Limestone; North, central, and south Texas including Quaternary for all of west Texas.

Infiernito caldera volcanic rocks including Capote Mountain Tuff, Tsh2 of Shely Group, Buckshot Ignimbrite, and Tm1 of Morita Ranch Formation (Late Eocene) at surface, covers < 0.1 % of this area

Infiernito caldera volcanic rocks including Capote Mountain Tuff, Tsh2 of Shely Group, Buckshot Ignimbrite, and Tm1 of Morita Ranch Formation

Sue Peaks Formation, Del Carmen Limestone, and Telephone Canyon Formation, undivided (Early Cretaceous) at surface, covers < 0.1 % of this area

Sue Peaks Formation, Del Carmen Limestone, and Telephone Canyon Formation, undivided

Mingus Formation (Pennsylvanian; Des Moines Series) at surface, covers < 0.1 % of this area

Mingus Formation

Neylandville Marl (Late Cretaceous; Gulfian Series) at surface, covers < 0.1 % of this area

Neylandville Marl

Brownstown Marl (Late Cretaceous; Gulfian Series) at surface, covers < 0.1 % of this area

Brownstown Marl

Coleman Junction Formation (Permian; Wolfcamp Series) at surface, covers < 0.1 % of this area

Coleman Junction Formation

Kemp clay (Late Cretaceous; Gulfian Series) at surface, covers < 0.1 % of this area

Kemp clay

Sand dune deposits (Holocene) at surface, covers < 0.1 % of this area

Sand dune deposits

Pawpaw Formation and upper limestone unit of Weno Formation, undivided (Early Cretaceous) at surface, covers < 0.1 % of this area

Pawpaw Formation and upper limestone unit of Weno Formation, undivided

Admiral and Coleman Junction Formations, undivided (Permian; Wolfcamp Series) at surface, covers < 0.1 % of this area

Admiral and Coleman Junction Formations, undivided

In Rio Grande delta area, clay veneer over meanderbelt sand (Quaternary) at surface, covers < 0.1 % of this area

In Rio Grande delta area, clay veneer over meanderbelt sand

McKnight Formation (Early Cretaceous) at surface, covers < 0.1 % of this area

McKnight Formation

Jones Basalt (Oligocene) at surface, covers < 0.1 % of this area

Jones Basalt

Grindstone Creek Formation, expanded (Pennsylvanian; Des Moines Series) at surface, covers < 0.1 % of this area

Grindstone Creek Formation, expanded

Chinle Formation (Late Triassic) at surface, covers < 0.1 % of this area

Chinle Formation

Pen Formation (Late Cretaceous) at surface, covers < 0.1 % of this area

Pen Formation

Devils Graveyard volcanic rocks (Eocene to Oligocene) at surface, covers < 0.1 % of this area

Devils Graveyard volcanic rocks

Duff Formation, Decie Member from Paisano caldera (Early Oligocene) at surface, covers < 0.1 % of this area

Duff Formation, Decie Member from Paisano caldera

Campagrande Formation (Early Cretaceous) at surface, covers < 0.1 % of this area

Campagrande Formation

Younger granitic intrusion (preCambrian (Proterozoic)) at surface, covers < 0.1 % of this area

Younger granitic intrusion

Eocene intrusive rocks (Eocene) at surface, covers < 0.1 % of this area

Eocene intrusive rocks

Eagle Ford Formation and Woodbine Formations, undivided (Late Cretaceous; Gulfian Series) at surface, covers < 0.1 % of this area

Eagle Ford Formation and Woodbine Formations, undivided

Fill and spoil (Holocene) at surface, covers < 0.1 % of this area

Fill and spoil

Brushy Canyon Formation (Permian; Guadalupe Series) at surface, covers < 0.1 % of this area

Brushy Canyon Formation

Fredericksberg Group and Maxon Sandstone, undivided (Early Cretaceous; Comanchean Series) at surface, covers < 0.1 % of this area

Fredericksberg Group and Maxon Sandstone, undivided

Wiley Mountain caldera volcanic rocks (Eocene) at surface, covers < 0.1 % of this area

Wiley Mountain caldera volcanic rocks

Pond deposits (Pleistocene) at surface, covers < 0.1 % of this area

Pond deposits

Sedwick and Moran Formations, undivided (Permian; Wolfcamp Series) at surface, covers < 0.1 % of this area

Sedwick and Moran Formations, undivided

Javelina Member of Tornillo Formation (Late Cretaceous and Paleocene) at surface, covers < 0.1 % of this area

Javelina Member of Tornillo Formation

Honeycut Formation (Early Ordovician) at surface, covers < 0.1 % of this area

Honeycut Formation

Wilke Ranch Formation (Permian; Leonard Series) at surface, covers < 0.1 % of this area

Wilke Ranch Formation

Sedwick Formation (Permian; Wolfcamp Series) at surface, covers < 0.1 % of this area

Sedwick Formation

Clay dune (Holocene) at surface, covers < 0.1 % of this area

Clay dune

Woods Hollow Shale, Fort Pena Formation, Alsate Shale, Marathon Limestone, and Dagger Flat Sandstone, undivided (Cambrian and Ordovician) at surface, covers < 0.1 % of this area

Woods Hollow Shale, Fort Pena Formation, Alsate Shale, Marathon Limestone, and Dagger Flat Sandstone, undivided

Ventioner Formation (Pennsylvanian; Missouri Series) at surface, covers < 0.1 % of this area

Ventioner Formation

Smithwick Formation (Middle Pennsylvanian; Atoka Series) at surface, covers < 0.1 % of this area

Smithwick Formation

Yazoo Formation (Late Eocene) at surface, covers < 0.1 % of this area

Yazoo Formation

Tertiary intrusive rocks, undivided (Tertiary) at surface, covers < 0.1 % of this area

Tertiary intrusive rocks, undivided

Boracho Limestone (Early Cretaceous) at surface, covers < 0.1 % of this area

Boracho Limestone

Yucca Formation (Early Cretaceous) at surface, covers < 0.1 % of this area

Yucca Formation

Santa Elena Limestone, Sue Peaks Formation, Del Carmen Limestone, and Telephone Canyon Formation, undivided (Early Cretaceous) at surface, covers < 0.1 % of this area

Santa Elena Limestone, Sue Peaks Formation, Del Carmen Limestone, and Telephone Canyon Formation, undivided

Deweyville Formation with higher level? (Quaternary; Pleistocene and Holocene?) at surface, covers < 0.1 % of this area

Deweyville Formation with higher level?

Gypsum of Rustler, Salado, and Castile Formations, undivided (Permian; Ochoa Series) at surface, covers < 0.1 % of this area

Gypsum of Rustler, Salado, and Castile Formations, undivided

Olmos Formation (Late Cretaceous; Gulfian Series) at surface, covers < 0.1 % of this area

Olmos Formation

Barnett Formation, Chappel Limestone, Houy, Zesch, Bear Spring, and Stribling Formations, and Pillar Bluff Limestone, undivided (Late; Middle; and Early Mississippian and Devonian) at surface, covers < 0.1 % of this area

Barnett Formation, Chappel Limestone, Houy, Zesch, Bear Spring, and Stribling Formations, and Pillar Bluff Limestone, undivided

El Picacho Formation (Late Cretaceous) at surface, covers < 0.1 % of this area

El Picacho Formation

Bone Spring Formation (Permian; Leonard Series) at surface, covers < 0.1 % of this area

Bone Spring Formation

Bluff Mesa Formation (Early Cretaceous) at surface, covers < 0.1 % of this area

Bluff Mesa Formation; Western part of Trans-Pecos Texas.

Cedarton Shale and Adams Branch Limestone, undivided (Pennsylvanian; Missouri Series) at surface, covers < 0.1 % of this area

Cedarton Shale and Adams Branch Limestone, undivided

Ojinaga Formation (Late Cretaceous) at surface, covers < 0.1 % of this area

Ojinaga Formation

Magdalena Formation (Pennsylvanian to Permian?) at surface, covers < 0.1 % of this area

Magdalena Formation

Gatuna Formation (Middle (?) Pleistocene) at surface, covers < 0.1 % of this area

Gatuna Formation

Eagle Mountains caldera volcanic rocks (Oligocene) at surface, covers < 0.1 % of this area

Eagle Mountains caldera volcanic rocks

Del Rio Clay (Late Cretaceous) at surface, covers < 0.1 % of this area

Del Rio Clay

San Miguel Formation (Late Cretaceous; Gulfian Series) at surface, covers < 0.1 % of this area

San Miguel Formation

Washita and Fredericksburg Groups, undivided (Early Cretaceous; Comanchean Series) at surface, covers < 0.1 % of this area

Washita and Fredericksburg Groups, undivided

Duck Creek Limestone (Early Cretaceous; Comanchean Series) at surface, covers < 0.1 % of this area

Duck Creek Limestone

Alkali flat deposits (Holocene) at surface, covers < 0.1 % of this area

Alkali flat deposits

Hazel Formation (preCambrian (Proterozoic); Grenville Series) at surface, covers < 0.1 % of this area

Hazel Formation

Rita Blanca Formation (Pliocene) at surface, covers < 0.1 % of this area

Rita Blanca Formation

Cow Creek Limestone, Hammett Shale, and Sycamore Sand, undivided (Early Cretaceous) at surface, covers < 0.1 % of this area

Cow Creek Limestone, Hammett Shale, and Sycamore Sand, undivided

Georgetown Limestone (Early Cretaceous) at surface, covers < 0.1 % of this area

Georgetown Limestone

Skinner Ranch and Hess Formations, undivided (Permian; Wolfcamp Series) at surface, covers < 0.1 % of this area

Skinner Ranch and Hess Formations, undivided

Bolson deposits (Pliocene) at surface, covers < 0.1 % of this area

Bolson deposits

El Paso Formation and Bliss Sandstone, undivided (Late Cambrian? to Early Ordovician) at surface, covers < 0.1 % of this area

El Paso Formation and Bliss Sandstone, undivided

Cutoff Formation (Permian; Leonard Series) at surface, covers < 0.1 % of this area

Cutoff Formation

Jasper Creek Formation (Late Pennsylvanian; Missouri Series) at surface, covers < 0.1 % of this area

Jasper Creek Formation

West Nueces Formation (Early Cretaceous; Comanchean Series) at surface, covers < 0.1 % of this area

West Nueces Formation

Caballos Novaculite and Maravillas Chert, undivided (Late Ordovician; Mississippian; and Devonian) at surface, covers < 0.1 % of this area

Caballos Novaculite and Maravillas Chert, undivided

Whitehorse Group and Blaine Formation, undivided (Permian; Guadalupe Series) at surface, covers < 0.1 % of this area

Whitehorse Group and Blaine Formation, undivided

Del Rio Clay and Georgetown Limestone, undivided (Late Cretaceous; Gulfian Series) at surface, covers < 0.1 % of this area

Del Rio Clay and Georgetown Limestone, undivided

Annona Chalk (Late Cretaceous; Gulfian Series) at surface, covers < 0.1 % of this area

Annona Chalk

Dimple Formation (Early Pennsylvanian) at surface, covers < 0.1 % of this area

Dimple Formation

Lazy Bend Formation (Pennsylvanian; Des Moines Series) at surface, covers < 0.1 % of this area

Lazy Bend Formation

Haymond Formation (Early Pennsylvanian) at surface, covers < 0.1 % of this area

Haymond Formation

Edwards Limestone and Antlers Sand, undivided (Early Cretaceous) at surface, covers < 0.1 % of this area

Edwards Limestone and Antlers Sand, undivided

Alluvium (Holocene) at surface, covers < 0.1 % of this area

WOODWARD- Lenticular and interfingering deposits of gravel, sand, silt, and clay. Generally light-tan to gray. Thickness along major streams ranges up to 100 feet and probably averages 40 feet; along minor streams the thickness ranges up to 45 feet and probably averages 20 feet. ENID- Sand, silt, clay, and locally gravel. Maximum thickness ranges from 30 to 80 feet (9 to 24 m) along major streams and from 0 to 60 feet (0 to 18 m) along minor streams. TULSA- Gravel, sand, silt, and clay. TULSA- Gravel, sand, silt, and clay. OKLAHOMA CITY- Sand, silt, clay, and lenticular beds of gravel. Thickness ranges from about 30 to 100 feet and probably averages about 50 feet along major streams. Along minor streams, thickness ranges from a few feet to about 50 feet and probably averages about 25 feet. LAWTON- Sand, clay, and gravel as much as 50 feet (15 m) thick; Shown only along major streams and tributaries. ARDMORE-SHERMAN- Gravel, sand, silt, and clay, including low terraces; thickness, about 25 to 100 feet. McALESTER TEXARKANA- Gravel, sand, silt, and clay, including low terraces about 30 feet above channels; thickness, about 50 feet along Little River and 110 feet along Red River.

Tessey Limestone (Permian; Ochoa Series) at surface, covers < 0.1 % of this area

Tessey Limestone

Cretaceous rocks, undivided (Late Cretaceous) at surface, covers < 0.1 % of this area

Cretaceous rocks, undivided

Gypsite deposits (Pleistocene and Holocene) at surface, covers < 0.1 % of this area

Gypsite deposits

Word Formation (Permian; Guadalupe Series) at surface, covers < 0.1 % of this area

Word Formation

Lost Creek Gneiss (preCambrian (Proterozoic)) at surface, covers < 0.1 % of this area

Lost Creek Gneiss

Tm2 and Tm3 units of Morita Ranch Formation (possibly from Cienega Mountain area) (Oligocene) at surface, covers < 0.1 % of this area

Tm2 and Tm3 units of Morita Ranch Formation (possibly from Cienega Mountain area)

Tarantula Gravel (Miocene) at surface, covers < 0.1 % of this area

Tarantula Gravel

Benevides Formation and Finlay Limestone, undivided (Early Cretaceous; Comanchean Series) at surface, covers < 0.1 % of this area

Benevides Formation and Finlay Limestone, undivided

Upper part of Shely Group, including Tm4 or Morita Ranch Formation (Oligocene) at surface, covers < 0.1 % of this area

Upper part of Shely Group, including Tm4 or Morita Ranch Formation

Pre-Brazos River rocks, undivided (Pennsylvanian; Des Moines Series) at surface, covers < 0.1 % of this area

Pre-Brazos River rocks, undivided

Ranger Limestone (Pennsylvanian; Missouri Series) at surface, covers < 0.1 % of this area

Ranger Limestone

Unnamed Pliocene deposits (Pliocene) at surface, covers < 0.1 % of this area

Unnamed Pliocene deposits

Yates Formation (Permian; Guadalupe Series) at surface, covers < 0.1 % of this area

Yates Formation

Eagle Ford Formation and Buda Limestone, undivided (Late Cretaceous) at surface, covers < 0.1 % of this area

Eagle Ford Formation and Buda Limestone, undivided

Comanche Peak Limestone and Walnut Clay, undivided (Early Cretaceous) at surface, covers < 0.1 % of this area

Comanche Peak Limestone and Walnut Clay, undivided

Bell Canyon, Cherry Canyon, and Brushy Canyon Formations undivided (Permian; Guadalupe Series) at surface, covers < 0.1 % of this area

Bell Canyon, Cherry Canyon, and Brushy Canyon Formations undivided

Seven Rivers Formation (Permian; Guadalupe Series) at surface, covers < 0.1 % of this area

Seven Rivers Formation

Igneous rocks of Austin age (Late Cretaceous) at surface, covers < 0.1 % of this area

Igneous rocks of Austin age

Nash Creek Formation (Oligocene) at surface, covers < 0.1 % of this area

Nash Creek Formation

Tule Formation (Pleistocene) at surface, covers < 0.1 % of this area

Tule Formation

Carlsbad Group (Permian; Guadalupe Series) at surface, covers < 0.1 % of this area

Carlsbad Group

Ector Chalk (Late Cretaceous; Gulfian Series) at surface, covers < 0.1 % of this area

Ector Chalk

Chico Ridge Limestone (Pennsylvanian; Missouri Series) at surface, covers < 0.1 % of this area

Chico Ridge Limestone

Loma Plata Formation (Early Cretaceous; Comanchean Series) at surface, covers < 0.1 % of this area

Loma Plata Formation

Fusselman Dolomite (Early and Middle Silurian) at surface, covers < 0.1 % of this area

Fusselman Dolomite

Moodys Branch Formation (Late Eocene) at surface, covers < 0.1 % of this area

Moodys Branch Formation

Upson Clay (Late Cretaceous; Gulfian Series) at surface, covers < 0.1 % of this area

Upson Clay

Double Lakes Formation (Pleistocene; Early Wisconsinan) at surface, covers < 0.1 % of this area

Double Lakes Formation

Goat Seep Formation (Permian; Guadalupe Series) at surface, covers < 0.1 % of this area

Goat Seep Formation

Cathederal Mountain Formation (Permian; Leonard Series) at surface, covers < 0.1 % of this area

Cathederal Mountain Formation

Big Branch Gneiss (preCambrian (Proterozoic)) at surface, covers < 0.1 % of this area

Big Branch Gneiss

Allamore Formation (preCambrian (Proterozoic); Grenville Series) at surface, covers < 0.1 % of this area

Allamore Formation

Carrizo Mountain Group showing metasedimentary rocks (preCambrian (Proterozoic)) at surface, covers < 0.1 % of this area

Carrizo Mountain Group showing metasedimentary rocks

South Rim Formation from Pine Canyon Caldera (Oligocene) at surface, covers < 0.1 % of this area

South Rim Formation from Pine Canyon Caldera

Santana Tuff from Sierra Rica caldera in Mexico (Oligocene) at surface, covers < 0.1 % of this area

Santana Tuff from Sierra Rica caldera in Mexico

Van Horn Sandstone (preCambrian (Proterozoic); Grenville Series) at surface, covers < 0.1 % of this area

Van Horn Sandstone

Yearwood Formation (Early Cretaceous) at surface, covers < 0.1 % of this area

Yearwood Formation

San Carlos Sandstone (Late Cretaceous) at surface, covers < 0.1 % of this area

San Carlos Sandstone

Black Gap area volcanic rocks (Miocene) at surface, covers < 0.1 % of this area

Black Gap area volcanic rocks

Comanche Peak Limestone, Walnut Clay, and Antlers Sand, undivided (Early Cretaceous) at surface, covers < 0.1 % of this area

Comanche Peak Limestone, Walnut Clay, and Antlers Sand, undivided; North, central, and south Texas including Quaternary for all of west Texas.

Espy Formation (Early Cretaceous) at surface, covers < 0.1 % of this area

Espy Formation

Willow Point Formation (Late Pennsylvanian; Missouri Series) at surface, covers < 0.1 % of this area

Willow Point Formation

Toy Limestone (Early (?) Pleistocene) at surface, covers < 0.1 % of this area

Toy Limestone

Gaptank Formation (Early; Middle; and Late Pennsylvanian) at surface, covers < 0.1 % of this area

Gaptank Formation

Montoya Dolomite (Middle and Late Ordovician) at surface, covers < 0.1 % of this area

Montoya Dolomite

Munn Formation (Permian; Guadalupe Series) at surface, covers < 0.1 % of this area

Munn Formation

Gulfian rocks, undivided (Late Cretaceous) at surface, covers < 0.1 % of this area

Gulfian rocks, undivided

Canyon Group, undivided (Late Pennsylvanian; Missouri Series) at surface, covers < 0.1 % of this area

Canyon Group, undivided

Bissett Conglomerate (Early Cretaceous) at surface, covers < 0.1 % of this area

Bissett Conglomerate

Tansill Formation (Permian; Guadalupe Series) at surface, covers < 0.1 % of this area

Tansill Formation

Carrizo Mountain Group showing metaigneous rocks (preCambrian (Proterozoic)) at surface, covers < 0.1 % of this area

Carrizo Mountain Group showing metaigneous rocks

Buda Limestone and Eagle Mountain Sandstone, undivided (Late Cretaceous) at surface, covers < 0.1 % of this area

Buda Limestone and Eagle Mountain Sandstone, undivided

Buda Limestone and San Martine Member of Borache Limestone, undivided (Late Cretaceous) at surface, covers < 0.1 % of this area

Buda Limestone and San Martine Member of Borache Limestone, undivided

Quitman Mountains caldera volcanic rocks and volcanic rocks of sneed (Cox) Mountain and west of Victorio Peak (Oligocene) at surface, covers < 0.1 % of this area

Quitman Mountains caldera volcanic rocks and volcanic rocks of sneed (Cox) Mountain and west of Victoria Peak

Granite (preCambrian (Proterozoic); Grenville Series) at surface, covers < 0.1 % of this area

Granite

Blanco Formation (Pliocene) at surface, covers < 0.1 % of this area

Blanco Formation

Shafter Formation (Early Cretaceous) at surface, covers < 0.1 % of this area

Shafter Formation

Pleistocene and Pliocene deposits, undifferentiated (Pleistocene to Pliocene) at surface, covers < 0.1 % of this area

TEXAS- Interfingering beds, tongues, and lenses of sand, silt, clay, gravel, sandstone, caliche, limestone, conglomerate, and volcanic ash. Includes Ogallala and Laverne Formations of Pliocene age and younger deposits of Pleistocene age. Locally the units are tightly cemented by calcium carbonate; other places, they are very poorly consolidated and nearly free of cementing materials. Thickness ranges from 0 to about 800 feet.

Hannold Hill Member of Tornillo Formation (Eocene) at surface, covers < 0.1 % of this area

Hannold Hill Member of Tornillo Formation

Van Horn Mountains caldera volcanic rocks (Eocene) at surface, covers < 0.1 % of this area

Van Horn Mountains caldera volcanic rocks

Eocene volcanic rocks (Eocene) at surface, covers < 0.1 % of this area

Eocene volcanic rocks

Comanchean rocks, undivided (Early Cretaceous; Washita Series) at surface, covers < 0.1 % of this area

Comanchean rocks, undivided

Fingers Formation (Pliocene) at surface, covers < 0.1 % of this area

Fingers Formation

Pinto Canyon Formation (Permian; Leonard and Guadalupe Series) at surface, covers < 0.1 % of this area

Pinto Canyon Formation

Rhyolite (preCambrian (Proterozoic); Grenville Series) at surface, covers < 0.1 % of this area

Rhyolite

Helms Shale, Rancheria Formation, Las Cruces Limestone, Percha Shale, and Canutillo Formations, undivided (Late Mississippian; Chesteran; and Devonian) at surface, covers < 0.1 % of this area

Helms Shale, Rancheria Formation, Las Cruces Limestone, Percha Shale, and Canutillo Formations, undivided

Onion Creek Marl (Pleistocene) at surface, covers < 0.1 % of this area

Onion Creek Marl

Alta Formation (Permian; Wolfcamp Series) at surface, covers < 0.1 % of this area

Alta Formation

Lenox Hills and Neal Ranch Formations, undivided (Permian; Wolfcamp Series) at surface, covers < 0.1 % of this area

Lenox Hills and Neal Ranch Formations, undivided

Malone Formation (Late Jurassic) at surface, covers < 0.1 % of this area

Malone Formation

Del Carmen Limestone (Early Cretaceous) at surface, covers < 0.1 % of this area

Del Carmen Limestone

Black Peaks Member of Tornillo Formation (Paleocene) at surface, covers < 0.1 % of this area

Black Peaks Member of Tornillo Formation

Duck Creek Limestone and Kiamichi Formation, undivided (Early Cretaceous) at surface, covers < 0.1 % of this area

Duck Creek Limestone and Kiamichi Formation, undivided; Eastern part of Trans-Pecos and High Plains.

Presidio Formation (Early Cretaceous; Aptian; Albian Series) at surface, covers < 0.1 % of this area

Presidio Formation

Llanoria Quartzite (preCambrian (Proterozoic); Grenville Series) at surface, covers < 0.1 % of this area

Llanoria Quartzite

Alluvium (Holocene to upper Pleistocene) at surface, covers < 0.1 % of this area

Alluvium

Cienequita Formation (Pennsylvanian; Middle and Late) at surface, covers < 0.1 % of this area

Cienequita Formation

Red Mountain Gneiss (preCambrian (Proterozoic)) at surface, covers < 0.1 % of this area

Red Mountain Gneiss

Mafic igneous rocks (preCambrian (Proterozoic)) at surface, covers < 0.1 % of this area

Mafic igneous rocks

Ross Mine Formation (Permian; Guadalupe Series) at surface, covers < 0.1 % of this area

Ross Mine Formation

Ordovician rocks, undivided (Ordovician) at surface, covers < 0.1 % of this area

Ordovician rocks, undivided

Ogallala Formation (Pliocene) at surface, covers < 0.1 % of this area

CIMARRON- Generally semiconsolidated clay, silt, sand, gravel, and caliche 0 to 400 feet thick. BEAVER- Interbedded sand, siltstone, clay, gravel lenses, and thin limestone. Caliche common near surface but occurrence is not limited to the surface. Caliche accounts for most of the white color in the Ogallala. Other colors generally light tan or buff but locally may be pastel shades of almost any color. The Laverne and Rexroad Formations of Pliocene age and the Meade Group and Odee (of local usage) and other formations of Pleistocene age occur locally and are included with the Ogallala Formation, 0-700 feet thick. WOODWARD- Gravel, sand, silt, clay, caliche, and limestone, locally cemented with calcium carbonate. Generally light-tan to gray to white. Thickness ranges up to 400 feet and probably averages 150 feet. CLINTON- Gray to light-brown, fine- to medium-grained sand with some, clay, silt, gravel, volcanic ash, and caliche beds; locally cemented by calcium carbonate. Thickness ranges from 0 to about 320 feet. The formation thins eastward.

Coal Creek Serpentinite (preCambrian (Proterozoic)) at surface, covers < 0.1 % of this area

Coal Creek Serpentinite

Castile Formation (Upper Permian) at surface, covers < 0.1 % of this area

Dominantly anhydrite sequence.

Alluvium (Holocene) at surface, covers < 0.1 % of this area

Gray to brownish gray clay and silty clay, reddish brown in the Red River Valley, some sand and gravel locally.

San Andres Formation (Guadalupian and Leonardian) at surface, covers < 0.1 % of this area

Limestone and dolomite with minor shale. Guadalupian in south, in part Leonardian to north.

Reklaw Formation, Carrizo Sand, and Wilcox and Midway Groups, undivided (Paleocene and Eocene) at surface, covers < 0.1 % of this area

Reklaw Formation, Carrizo Sand, and Wilcox and Midway Groups, undivided

Cloud Chief Formation (Permian; Guadalupe Series) at surface, covers < 0.1 % of this area

Cloud Chief Formation

Dewey Lake Red beds (Permian; Ochoa Series) at surface, covers < 0.1 % of this area

Dewey Lake Red beds

Piedmont alluvial deposits (Holocene to lower Pleistocene) at surface, covers < 0.1 % of this area

Includes deposits of higher gradient tributaries bordering major stream valleys, alluvial veneers of the piedmont slope, and alluvial fans. May locally include uppermost Pliocene deposits.

Briggs Formation (Permian; Leonard Series) at surface, covers < 0.1 % of this area

Briggs Formation

Unnamed Pennsylvanian rocks (Pennsylvanian) at surface, covers < 0.1 % of this area

Unnamed Pennsylvanian rocks

Permian rocks, undivided (Permian) at surface, covers < 0.1 % of this area

Permian rocks, undivided

Torcer Formation (Early Cretaceous) at surface, covers < 0.1 % of this area

Torcer Formation

Upper Cretaceous rocks, undivided (Late Cretaceous) at surface, covers < 0.1 % of this area

Upper Cretaceous rocks, undivided

Sue Peaks Formation (Early Cretaceous) at surface, covers < 0.1 % of this area

Sue Peaks Formation

Paleozoic rocks, undivided (Paleozoic) at surface, covers < 0.1 % of this area

Paleozoic rocks, undivided

Mina Grande Formation (Permian; Guadalupe Series) at surface, covers < 0.1 % of this area

Mina Grande Formation

Eolian and piedmont deposits (Holocene to middle Pleistocene) at surface, covers < 0.1 % of this area

Interlayered eolian sands and piedmont-slope deposits along the eastern flank of the Pecos River valley, primarily between Roswell and Carlsbad. Typically capped by thin eolian deposits.

Morrison Formation (Late Jurassic) at surface, covers < 0.1 % of this area

Morrison Formation

Etholen Conglomerate (Early Cretaceous) at surface, covers < 0.1 % of this area

Etholen Conglomerate

Alluvium - Alluvial deposits in major stream channels or in mappable meanders of major streams (Holocene) at surface, covers < 0.1 % of this area

Alluvial deposits in major stream channels or in mappable meanders of major streams - Includes alluvial deposits in natural levees in some areas.

Cibolo Formation (Permian; Leonard Series) at surface, covers < 0.1 % of this area

Cibolo Formation

Dakota and Purgatoir Formations, undivided (Early Cretaceous) at surface, covers < 0.1 % of this area

Dakota and Purgatoir Formations, undivided

Artesia Group (Guadalupian) at surface, covers < 0.1 % of this area

Shelf facies forming broad south-southeast trending outcrop from Glorieta to Artesia area; includes Tansill, Yates, Seven Rivers, Queen and Grayburg Formations (Guadalupian). May locally include Moenkopi Formation (Triassic) at top.

San Carlos Tuff from San Carlos caldera in Mexico (Oligocene) at surface, covers < 0.1 % of this area

San Carlos Tuff from San Carlos caldera in Mexico

Mundy Breccia and Castner Limestone, undivided (preCambrian (Proterozoic)) at surface, covers < 0.1 % of this area

Mundy Breccia and Castner Limestone, undivided

Benevides Formation (Early Cretaceous; Comanchean Series) at surface, covers < 0.1 % of this area

Benevides Formation

Rustler Formation (Upper Permian) at surface, covers < 0.1 % of this area

Siltstone, gypsum, sandstone, and dolomite.

Alluvium (Holocene) at surface, covers < 0.1 % of this area

Alluvial deposits of present streams

Mississippi, Devonian, and Ordovician rocks, undivided (Mississippi; Devonian; and Ordovician) at surface, covers < 0.1 % of this area

Mississippi, Devonian, and Ordovician rocks, undivided

Older alluvial deposits of upland plains and piedmont areas, and calcic soils and eolian cover sediments of High Plains region (Middle to lower Pleistocene) at surface, covers < 0.1 % of this area

Includes scattered lacustrine, playa, and alluvial deposits of the Tahoka, Double Tanks, Tule, Blanco, Blackwater Draw, and Gatuna Formations, the latter of which may be Pliocene at base; outcrops, however, are basically of Quaternary deposits.

Queen and Grayburg Formations (Guadalupian) at surface, covers < 0.1 % of this area

Sandstone, gypsum, anhydrite, dolomite, and red mudstone.

Miocene intrusive rocks (Miocene) at surface, covers < 0.1 % of this area

Miocene intrusive rocks

Salado Formation (Upper Permian) at surface, covers < 0.1 % of this area

Evaporite sequence, dominantly halite.

Alluvium (Holocene) at surface, covers < 0.1 % of this area

CIMARRON- Clay, silt, sand, and gravel 0 to 100 feet thick. TEXAS- Sand, silt, clay, and gravel located in valleys of principal streams. Thickness not known but may exceed 100 feet in North Canadian River valley and may be 50 to 100 feet in lower parts of valleys of Coldwater and Palo Duro Creeks BEAVER - Sand, gravel, silt, and clay in discontinuous lenses along courses of larger streams. 0-50 feet thick.

Bell Canyon Formation (Guadalupian) at surface, covers < 0.1 % of this area

Basin facies - sandstone, limestone, and shale.

Capitan Formation (Guadalupian) at surface, covers < 0.1 % of this area

Limestone (reef facies).

Tertiary intrusive rocks of intermediate to silicic composition (Pliocene to Eocene) at surface, covers < 0.1 % of this area

Includes monzonitic to granitic plutons, stocks, laccoliths, and porphyritic dikes in deeply eroded magmatic centers; and andesitic, dacitic, or rhyolitic plugs and dikes near cauldrons or stratovolcanoes. In the Latir field, fine-grained rhyolitic dikes commonly cut coarse-grained granitic plutons. Includes alkaline laccoliths, plugs, and dikes in Colfax County. North-trending dikes near Capitan include some mafic diabase dikes.

Ogallala Formation (Lower Pliocene to middle Miocene) at surface, covers < 0.1 % of this area

Alluvial and eolian deposits, and petrocalcic soils of the southern High Plains. Locally includes Qoa.

Quartermaster Formation; red sandstone and siltstone; Upper Permian (Upper Permian) at surface, covers < 0.1 % of this area

Red sandstone and siltstone.

Eolian deposits (Holocene to middle Pleistocene) at surface, covers < 0.1 % of this area

Eolian deposits.

Upper Santa Fe Group (Middle Pleistocene to uppermost Miocene) at surface, covers < 0.1 % of this area

Includes Camp Rice, Fort Hancock, Palomas, Sierra Ladrones, Arroyo Ojito, Ancha, Puye, and Alamosa Formations.

Dune Sand (Pleistocene) at surface, covers < 0.1 % of this area

CIMARRON- Fine- to medium-grained sand 0 to 40 feet thick. TEXAS- Fine to coarse windblown sand. Maximum thickness about 30 feet. BEAVER- Fine to coarse, round to sub-round, windblown sand consisting mostly of quartz grains. 0-50 feet thick.

Seven Rivers Formation (Guadalupian) at surface, covers < 0.1 % of this area

Gypsum, anhydrite, salt, dolomite, and siltstone.

Permian rocks undifferentiated (Late Permian to Early Permian) at surface, covers < 0.1 % of this area

TEXAS- Red to dark reddish-brown shale, sandstone, and siltstone. Gypsum occurs in all rock units as a cementing agent, as tiny flakes, as thin irregular veinlets, and as discontinuous beds ranging from less than an inch to more than 30 feet thick. Maximum thickness exceeds 2,000 feet. BEAVER- Red shale, sandstone, and siltstone, are predominant rocks with lesser amounts of limestone, dolomite, gypsum, and salt. The undifferentiated Permian rocks include the Whitehorse Group, the Cloud Chief Formation, and the Quartermaster Formation; also included are local outcrops in the southwestern part of the county, which maybe Triassic in age, 3,800 feet thick.

Cutoff Shale (Leonardian) at surface, covers < 0.1 % of this area

In Brokeoff Mountains only.

Lower Cretaceous, undivided (Lower Cretaceous) at surface, covers < 0.1 % of this area

In northern Lea and Roosevelt Counties includes equivalents of Tucumcari Shale; in Cornudas Mountains includes Campogrande and Cox Formations and Washita Group; at Cerro de Cristo Rey includes several formations of the Fredricksburg and Washita Groups, and the Boquillas Formation (Cenomanian); in the southwest includes Mojado, U-Bar (Aptian), and Hell-to-Finish Formations, whch are equivalent to Bisbee Group of Arizona.

Terrace Deposits (Pleistocene) at surface, covers < 0.1 % of this area

WOODWARD- Lenticular and interfingering deposits of light-tan to gray gravel, sand, silt, clay, and volcanic ash. Sand dunes are common in many places. Thickness ranges up to 150 feet and averages about 60 feet. ENID- Sand, silt, clay, and gravel. Maximum thickness, about 75 feet (23 m) along major streams. TULSA- Fine gravel, sand, silt, and clay. CLINTON- Stream-laid deposits of sand, silt, clay, gravel, and volcanic ash; thickness ranges from 0 to about 120 feet. OKLAHOMA CITY- Lenticular beds of sand, silt, clay, and gravel. Thickness ranges from a few feet to about 100 feet and probably averages about 50 feet along major streams. FORT SMITH- Gravel, sand, silt, and clay. LAWTON- Sand, clay, and gravel as much as 75 feet (23 m) in Tillman County, ranging from 5 to 50 feet (2 to 15 m) elsewhere. ARDMORE-SHERMAN- Gravel, sand, silt, clay, and volcanic ash; thickness, about 5 to 50 feet; at various levels, as high as 160 feet above present flood plains. McALESTER TEXARKANA- Gravel, sand, silt, clay, and volcanic ash; several levels 20 to 160 feet or more above present flood plains, with each level containing deposits that average 20 to 30 feet in thickness, some windblown sand on top; may include colluvial wash down sides of hills.

Cherry Canyon Formation (Guadalupian) at surface, covers < 0.1 % of this area

Basin facies - sandstone, limestone, and shale.

Victorio Peak Limestone (Leonardian) at surface, covers < 0.1 % of this area

In Brokeoff Mountains only.

Chenier Plain, Saline Marsh (Holocene) at surface, covers < 0.1 % of this area

Gray to brown to black clay and silt of moderate organic content.

Dakota Formation (Early and Late Cretaceous) at surface, covers < 0.1 % of this area

Dakota Formation

Caddo Formation (Early Cretaceous) at surface, covers < 0.1 % of this area

ARDMORE-SHERMAN-Limestones, marls, and shales; 150 feet thick. Subdivided into "Fort Worth Limestone" at top and "Duck Creek Limestone" below. McALESTER TEXARKANA- Limestones, white to cream, silty, alternating with gray shales, with "Texigryphaea washitaensis;" 7-foot bed at top (Fort Worth equivalent) and blue-gray silty shales and limestones below with "Texigryphaea navia" (Duck Creek equivalent); thickness, 150 feet. Ouachita Mountain uplift; S. OK folded belt province.

Pennsylvanian rocks, undivided (Pennsylvanian) at surface, covers < 0.1 % of this area

In Sangre de Cristo Mountains may include Sandia, Madera, La Pasada, Alamitos, and Flechado Formations; elsewhere may include Bar-B, Nakaye, Red House, Oswaldo, and Syrena Formations.

Dune Sand (Pleistocene) at surface, covers < 0.1 % of this area

CLINTON- Wind-blown sand; thickness ranges from a thin Veneer to about 70 feet. LAWTON- Wind-laid sand; maximum thickness about 50 feet (15 m).

Hueco Formation or Group (Wolfcampian) at surface, covers < 0.1 % of this area

Limestone unit restricted to south-central area; Pendejo Tongue of Hueco Formation divides Abo Formation into upper and lower parts in Sacramento Mountains.

Mississippian and Devonian rocks, undivided (Mississippian and Devonian) at surface, covers < 0.1 % of this area

Includes Helms, Rancheria, Las Cruces, Lake Valley, and Caballero Formations and Escabrosa Group (Mississippian); Percha Shale, Contadero, Sly Gap, and Onate Formations of south-central New Mexico, and Canutillo Formation of northern Franklin Mountains and Bishops Cap area (Devonian).

Woodbine Formation (Late Cretaceous) at surface, covers < 0.1 % of this area

McALESTER TEXARKANA- Sand, dark-green, yellowish-red, white, gray, fine- to coarse-grained, tuffaceous in upper part; crossbedded, quartzose, and brownish-red noncalcareous clay; some gravel lentils with little to no quartz and some lignites and fossil plants; rests unconformably upon successively older Cretaceous units eastward; thickness, 325 to 455 feet, increasing eastward.

Antlers Sand or Antlers Sandstone (Early Cretaceous) at surface, covers < 0.1 % of this area

ARDMORE-SHERMAN- "Antlers Sand" Sand, white to yellow, medium-grained, weakly indurated, with varicolored clays. Contains arkosic conglomerates near Arbuckle Mountains and "Baum Limestone" near Mannsville anticline. Thickness, 200 to 700 feet. McALESTER TEXARKANA- "Antlers Sandstone" Sandstone and sand, white to reddish-yellow to orange-brown to gray, fine- to coarse-grained, quartzose, crossbedded, moderately to weakly indurated, interbedded with varicolored clays and conglomerates; contains fossil wood and dinosaurs; rests unconformably upon Ouachita rocks but conformably upon DeQueen Limestone; thickness, 0 to 320 feet, thickening southeastward to 900 feet in subsurface.

Silurian and Ordovician rocks, undivided (Silurian and Ordovician) at surface, covers < 0.1 % of this area

Silurian and Ordovician rocks, undivided

Yeso Formation (Leonardian) at surface, covers < 0.1 % of this area

Sandstones, siltstones, anhydrite, gypsum, halite, and dolomite.

Upper Chinle Group, Garita Creek through Redonda Formations, undivided (Upper Triassic) at surface, covers < 0.1 % of this area

Upper Chinle Group, Garita Creek through Redonda Formations, undivided

Lacustrine and playa-lake deposits (Holocene) at surface, covers < 0.1 % of this area

Includes associated alluvial and eolian deposits of major lake basins.