Blackwater Draw Formation
Sand sheet deposits
Quaternary deposit, undivided
Queen City Sand
Beaumont Formation, areas predominantly sand
Beaumont Formation, areas predominantly clay
Wilcox Group, undivided
Glen Rose Limestone
Whitehorse Group, undivided
Clear Fork Group
Alluvial fan deposits
Older alluvial deposits
Dune sand sheet deposits
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.
Cook Mountain Formation
Quartermaster Formation; North and central Texas including panhandle.
Eagle Ford Formation
Thrifty and Graham Formations, undivided
Sand deposits, undivided
Devils River Limestone
Jackson Group, undivided
El Pico Clay
Paluxy Sand and Glen Rose Limestone, undivided
Twin Mountains Formation
Calvert Bluff Formation
Midway Group, undivided
Santa Elena Limestone
Archer City Formation
Undivided part Fredericksberg Group
Wills Point Formation
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
Salmon Peak Limestone
Perdiz Conglomerate, Tascotal Formation, and tuffaceous sediments of Fresno Formation
Salado and Castile Formations, undivided
Wolfe City Formation
Grayson Marl and Main Street Limestone, undivided
Fleming Formation and Oakville Sandstone, undivided
Fort Worth Limestone and Duck Creek Formation, undivided
Neylandville and Marlbrook Marls, undivided
Quaternary-Tertiary bolson deposits
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
San Angelo Formation
Pecan Gap Chalk
Navarro Group and Marlbrook Marl, undivided
Waggoner Ranch Formation
Jagger Bend and Valera Formations, undivided
Goodland Limestone and Walnut Clay, undivided
Bead Mountain Formation
Alluvium in Rio Grande, subdivided into areas predominantly of sand
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
Valley Spring Gneiss
Town Mountain Granite
Barrier island deposits
Victorio Peak Formation
Travis Peak Formation
Lower part of Washita Group
Grape Creek Formation
Pawpaw Formation, Weno Limestone, and Denton Clay, undivided
Gober Chalk and Roxton Limestone
Alluvium in Rio Grande, subdivided into areas predominantly of clay
Home Creek Limestone and Colony Creek Shale, undivided
Navarro and Taylor Groups, undivided
Chinati Mountains caldera volcanic rocks, including Chinati Mountains Group, Mitchell Mesa Ignimbrite, and type area of Petan Basalt
Ranger Limestone and Placid Creek Shale, undivided
Bell Canyon Formation
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
Elm Creek Formation
Undivided parts of Washita and Fredericksberg Groups
Cherry Canyon Formation
Undivided part of Washita Group
Navarro Group, undivided
Edwards and Comanche Peak Limestones, undivided
Santa Anna Branch Shale
Catahoula Formation and Frio Clay, undivided
Maxon Sandstone and Glen Rose Limestone, undivided
Vieja Group, including Bracks Rhyolite, Chambers and Colmena Tuffs and Gill Breccia
Mineral Wells Formation
Barrier ridge and barrier flat deposts
Oligocene intrusive rocks
Palo Pinto Formation
Wilberns Formation showing San Saba Member
Marble Falls Limestone
Quaternary-Tertiary deposits, undivided
Manning, Wellborn, and Cadell Formations, undivided
Kemp clay and Corsicana Marl, undivided
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
Riley Formation showing Lion Mountain Sandstone and Cap Mountain Limestone Members, undivided
Land slide deposits
Wolf Mountain Shale
Wilberns Formation showing Point Peak, Morgan Creek Limestone, and Welge Sandstone Members, undivided
Brazos River Formation
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
Sue Peaks Formation, Del Carmen Limestone, and Telephone Canyon Formation, undivided
Coleman Junction Formation
Sand dune deposits
Pawpaw Formation and upper limestone unit of Weno Formation, undivided
Admiral and Coleman Junction Formations, undivided
In Rio Grande delta area, clay veneer over meanderbelt sand
Grindstone Creek Formation, expanded
Devils Graveyard volcanic rocks
Duff Formation, Decie Member from Paisano caldera
Younger granitic intrusion
Eocene intrusive rocks
Eagle Ford Formation and Woodbine Formations, undivided
Fill and spoil
Brushy Canyon Formation
Fredericksberg Group and Maxon Sandstone, undivided
Wiley Mountain caldera volcanic rocks
Sedwick and Moran Formations, undivided
Javelina Member of Tornillo Formation
Wilke Ranch Formation
Woods Hollow Shale, Fort Pena Formation, Alsate Shale, Marathon Limestone, and Dagger Flat Sandstone, undivided
Tertiary intrusive rocks, undivided
Santa Elena Limestone, Sue Peaks Formation, Del Carmen Limestone, and Telephone Canyon Formation, undivided
Deweyville Formation with higher level?
Gypsum of Rustler, Salado, and Castile Formations, undivided
Barnett Formation, Chappel Limestone, Houy, Zesch, Bear Spring, and Stribling Formations, and Pillar Bluff Limestone, undivided
El Picacho Formation
Bone Spring Formation
Bluff Mesa Formation; Western part of Trans-Pecos Texas.
Cedarton Shale and Adams Branch Limestone, undivided
Eagle Mountains caldera volcanic rocks
Del Rio Clay
San Miguel Formation
Washita and Fredericksburg Groups, undivided
Duck Creek Limestone
Alkali flat deposits
Rita Blanca Formation
Cow Creek Limestone, Hammett Shale, and Sycamore Sand, undivided
Skinner Ranch and Hess Formations, undivided
El Paso Formation and Bliss Sandstone, undivided
Jasper Creek Formation
West Nueces Formation
Caballos Novaculite and Maravillas Chert, undivided
Whitehorse Group and Blaine Formation, undivided
Del Rio Clay and Georgetown Limestone, undivided
Lazy Bend Formation
Edwards Limestone and Antlers Sand, undivided
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.
Cretaceous rocks, undivided
Lost Creek Gneiss
Tm2 and Tm3 units of Morita Ranch Formation (possibly from Cienega Mountain area)
Benevides Formation and Finlay Limestone, undivided
Upper part of Shely Group, including Tm4 or Morita Ranch Formation
Pre-Brazos River rocks, undivided
Unnamed Pliocene deposits
Eagle Ford Formation and Buda Limestone, undivided
Comanche Peak Limestone and Walnut Clay, undivided
Bell Canyon, Cherry Canyon, and Brushy Canyon Formations undivided
Seven Rivers Formation
Igneous rocks of Austin age
Nash Creek Formation
Chico Ridge Limestone
Loma Plata Formation
Moodys Branch Formation
Double Lakes Formation
Goat Seep Formation
Cathederal Mountain Formation
Big Branch Gneiss
Carrizo Mountain Group showing metasedimentary rocks
South Rim Formation from Pine Canyon Caldera
Santana Tuff from Sierra Rica caldera in Mexico
Van Horn Sandstone
San Carlos Sandstone
Black Gap area volcanic rocks
Comanche Peak Limestone, Walnut Clay, and Antlers Sand, undivided; North, central, and south Texas including Quaternary for all of west Texas.
Willow Point Formation
Gulfian rocks, undivided
Canyon Group, undivided
Carrizo Mountain Group showing metaigneous rocks
Buda Limestone and Eagle Mountain Sandstone, undivided
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 Victoria Peak
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
Van Horn Mountains caldera volcanic rocks
Eocene volcanic rocks
Comanchean rocks, undivided
Pinto Canyon Formation
Helms Shale, Rancheria Formation, Las Cruces Limestone, Percha Shale, and Canutillo Formations, undivided
Onion Creek Marl
Lenox Hills and Neal Ranch Formations, undivided
Del Carmen Limestone
Black Peaks Member of Tornillo Formation
Duck Creek Limestone and Kiamichi Formation, undivided; Eastern part of Trans-Pecos and High Plains.
Red Mountain Gneiss
Mafic igneous rocks
Ross Mine Formation
Ordovician rocks, undivided
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
Dominantly anhydrite sequence.
Gray to brownish gray clay and silty clay, reddish brown in the Red River Valley, some sand and gravel locally.
Limestone and dolomite with minor shale. Guadalupian in south, in part Leonardian to north.
Reklaw Formation, Carrizo Sand, and Wilcox and Midway Groups, undivided
Cloud Chief Formation
Dewey Lake Red beds
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.
Unnamed Pennsylvanian rocks
Permian rocks, undivided
Upper Cretaceous rocks, undivided
Sue Peaks Formation
Paleozoic rocks, undivided
Mina Grande Formation
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.
Alluvial deposits in major stream channels or in mappable meanders of major streams - Includes alluvial deposits in natural levees in some areas.
Dakota and Purgatoir Formations, undivided
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
Mundy Breccia and Castner Limestone, undivided
Siltstone, gypsum, sandstone, and dolomite.
Alluvial deposits of present streams
Mississippi, Devonian, and Ordovician rocks, undivided
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.
Sandstone, gypsum, anhydrite, dolomite, and red mudstone.
Miocene intrusive rocks
Evaporite sequence, dominantly halite.
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.
Basin facies - sandstone, limestone, and shale.
Limestone (reef facies).
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.
Alluvial and eolian deposits, and petrocalcic soils of the southern High Plains. Locally includes Qoa.
Red sandstone and siltstone.
Includes Camp Rice, Fort Hancock, Palomas, Sierra Ladrones, Arroyo Ojito, Ancha, Puye, and Alamosa Formations.
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.
Gypsum, anhydrite, salt, dolomite, and siltstone.
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.
In Brokeoff Mountains only.
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.
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.
Basin facies - sandstone, limestone, and shale.
In Brokeoff Mountains only.
Gray to brown to black clay and silt of moderate organic content.
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.
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.
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).
Limestone unit restricted to south-central area; Pendejo Tongue of Hueco Formation divides Abo Formation into upper and lower parts in Sacramento Mountains.
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).
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.
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
Sandstones, siltstones, anhydrite, gypsum, halite, and dolomite.
Upper Chinle Group, Garita Creek through Redonda Formations, undivided
Includes associated alluvial and eolian deposits of major lake basins.