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Mineral Resources > Online Spatial Data > Geology > by state > Texas Geology

Geologic units in Texas (state in United States)

[Additional scientific data in this geographic area]

Alluvium (Phanerozoic | Cenozoic | Quaternary | Holocene) at surface, covers < 0.1 % of this area
Alluvium - Alluvial deposits of present streams
Lithology: alluvium
Alluvium - Alluvial deposits in major stream channels or in mappable meanders of major streams (Phanerozoic | Cenozoic | Quaternary | 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.
Lithology: alluvium
Alluvium (Phanerozoic | Cenozoic | Quaternary | 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.
Lithology: clay or mud; sand; gravel
Chenier Plain, Saline Marsh (Phanerozoic | Cenozoic | Quaternary | Holocene) at surface, covers < 0.1 % of this area
gray to brown to black clay and silt of moderate organic content.
Lithology: clay or mud; silt
Mississippian and Devonain rocks, undivided (Phanerozoic | Paleozoic | Devonian Carboniferous Mississippian) at surface, covers < 0.1 % of this area
Mississippian and Devonian rocks, undivided; includes the Lake Valley Limestone, Caballero, Las Cruces, Rancheria, and Helms Formations and Escabrosa Group; Mississippian; the Onate, Sly Gap, Contadero Formations, and Percha Shale of south-central New Mexico, and Canutillo Formation of Northern Franklin Mountains and Bishops Cap area; Devonian
Lithology: carbonate; medium-grained mixed clastic
Pennsylvanian rocks, undivided (Phanerozoic | Paleozoic | Carboniferous Pennsylvanian) at surface, covers < 0.1 % of this area
Pennsylvanian rocks, undivided; in Sangre de Cristo Mountains may include Sandia Formation, Madera Limestone, La Pasada, Alamitos, and Flechado Formations; elsewhere may include Bar-B, Nakaye, Red House, Oswaldo, and Syrena Formations
Lithology: sedimentary rock; medium-grained mixed clastic; carbonate
Artesia Group (Phanerozoic | Paleozoic | Permian) at surface, covers < 0.1 % of this area
Artesia Group; shelf facies forming broad south-southeast trending outcrop from Glorieta to Artesia area; includes Grayburg, Queen, Seven Rivers, Yates, and Tansill Formations; Guadalupian. May locally include Moenkopi Formation (Triassic) at top
Lithology: fine-grained mixed clastic; dolostone (dolomite); evaporite
Bell Canyon Formation (Phanerozoic | Paleozoic | Permian) at surface, covers < 0.1 % of this area
Bell Canyon Formation; basin facies-sandstone, limestone, and shale; Guadalupian
Lithology: sandstone; limestone; shale
Castile Formation (Phanerozoic | Paleozoic | Permian) at surface, covers < 0.1 % of this area
Castile Formation; dominantly anhydrite sequence; Upper Permian
Lithology: evaporite; limestone
Cherry Canyon Formation (Phanerozoic | Paleozoic | Permian) at surface, covers < 0.1 % of this area
Cherry Canyon Formation; basin facies-sandstone, limestone, and shale
Lithology: sandstone; limestone; shale
Cutoff Shale (Phanerozoic | Paleozoic | Permian) at surface, covers < 0.1 % of this area
Cutoff Shale; in Brokeoff Mountains only
Lithology: shale
Capitan Formation (Phanerozoic | Paleozoic | Permian) at surface, covers < 0.1 % of this area
Capitan Formation; Upper Guadalupian age limestone (reef facies)
Lithology: carbonate
Grayburg and Queen Fromations (Phanerozoic | Paleozoic | Permian) at surface, covers < 0.1 % of this area
Grayburg and Queen Formations; sandstone, gypsum, anhydrite, dolomite, and red mudstone; Guadalupian
Lithology: carbonate; sandstone; evaporite; shale; bentonite; mudstone
Hueco Formation (Phanerozoic | Paleozoic | Permian) at surface, covers < 0.1 % of this area
Hueco Formation; limestone unit restricted to south-central area; Pendejo Tongue divides Abo Formation into upper and lower parts; Wolfcampian
Lithology: limestone; shale; conglomerate
Quartermaster Formation (Phanerozoic | Paleozoic | Permian) at surface, covers < 0.1 % of this area
Quartermaster Formation; red sandstone and siltstone; Upper Permian
Lithology: sandstone; mudstone; evaporite
Rustler Formation (Phanerozoic | Paleozoic | Permian) at surface, covers < 0.1 % of this area
Rustler Formation; siltstone, gypsum, sandstone, and dolomite; Upper Permian
Lithology: carbonate; fine-grained mixed clastic; evaporite
San Andres Formation (Phanerozoic | Paleozoic | Permian) at surface, covers < 0.1 % of this area
San Andres Formation; limestone and dolomite with minor shale; Guadalupian in south, in part Leonardian to north
Lithology: carbonate; fine-grained mixed clastic; evaporite
Salado Formation (Phanerozoic | Paleozoic | Permian) at surface, covers < 0.1 % of this area
Salado Formation; evaporite sequence; Upper Permian
Lithology: evaporite; sandstone
Seven Rivers Formation (Phanerozoic | Paleozoic | Permian) at surface, covers < 0.1 % of this area
Seven Rivers Formation; gypsum, anhydrite, salt, dolomite, and siltstone; Guadalupian
Lithology: evaporite; fine-grained mixed clastic; dolostone (dolomite)
Victoria Peak Limestone (Phanerozoic | Paleozoic | Permian) at surface, covers < 0.1 % of this area
Victorio Peak Limestone; in Brokeoff Mountains only
Lithology: limestone
alluvium (Phanerozoic | Cenozoic | Quaternary) at surface, covers < 0.1 % of this area
Alluvium; upper and middle Quaternary
Lithology: alluvium
eolian deposits (Phanerozoic | Cenozoic | Quaternary) at surface, covers < 0.1 % of this area
Eolian deposits
Lithology: eolian
older alluvial deposits of upland plains and piedmont areas (Phanerozoic | Cenozoic | Quaternary) at surface, covers < 0.1 % of this area
Older alluvial deposits of upland plains and piedmont areas, and calcic soils and eolian cover sediments of High Plains region; 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; upper Quaternary to uppermost Pliocene(?)
Lithology: alluvium
piedmont alluvial deposits (Phanerozoic | Cenozoic | Quaternary) at surface, covers < 0.1 % of this area
Piedmont alluvial deposits: upper and middle Quaternary; includes deposits of higher gradient tributaries bordering major stream valleys, alluvial veneers of the piedmont slope, and alluvial fans
Lithology: alluvium
lacustrine and playa-lake deposits (Phanerozoic | Cenozoic | Quaternary) at surface, covers < 0.1 % of this area
Lacustrine and playa-lake deposits; includes associated alluvial and eolian deposits of major lake basins; upper Quaternary
Lithology: lake or marine deposit (non-glacial); alluvium; eolian
Silurian and Ordovician rocks, undivided (Phanerozoic | Paleozoic | Ordovician Silurian) at surface, covers < 0.1 % of this area
Silurian and Ordovician rocks, undivided
Lithology: sedimentary rock
intrusive rocks (Phanerozoic | Cenozoic | Tertiary) at surface, covers < 0.1 % of this area
Tertiary intrusive rocks; undifferentiated
Lithology: plutonic rock (phaneritic)
Ogallala Formation (Phanerozoic | Cenozoic | Tertiary) at surface, covers < 0.1 % of this area
Ogallala Formation, alluvial and eolian deposits, and petrocalcic soils of the southern High Plains; Lower Pliocene to middle Miocene (locally includes unit Qoa)
Lithology: alluvium; eolian; carbonate
upper Chinle Group (Garita Creek, Trujillo, Bull Canyon, and Redonda Formations) (Phanerozoic | Mesozoic | Triassic) at surface, covers < 0.1 % of this area
Upper Chinle Group, Garita Creek through Redonda Formations, undivided
Lithology: medium-grained mixed clastic; fine-grained mixed clastic; limestone
Antlers Sand or Antlers Sandstone (Phanerozoic | Mesozoic | Cretaceous-Early ) 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.
Lithology: sandstone; mudstone; conglomerate; limestone
Caddo Formation (Phanerozoic | Mesozoic | Cretaceous-Early ) 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
Lithology: limestone; shale
Woodbine Formation (Phanerozoic | Mesozoic | Cretaceous-Late) 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.
Lithology: sandstone; clay or mud; gravel; coal
Permian rocks undifferentiated (Phanerozoic | Paleozoic | 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
Lithology: shale; sandstone; siltstone; limestone; dolostone (dolomite); evaporite
Alluvium (Phanerozoic | Cenozoic | Quaternary | 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
Lithology: alluvium
Alluvium (Phanerozoic | Cenozoic | Quaternary | 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
Lithology: alluvium
Dune Sand (Phanerozoic | Cenozoic | Quaternary | 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).
Lithology: sand
Terrace Deposits (Phanerozoic | Cenozoic | Quaternary | 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
Lithology: sand; gravel; volcanic ash
Ogallala Formation (Phanerozoic | Cenozoic | Tertiary | 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.
Lithology: sand; siltstone; clay or mud; gravel; limestone; volcanic ash
Pleistocene and Pliocene deposits, undifferentiated (Phanerozoic | Cenozoic | Tertiary Quaternary | Pliocene Pleistocene) 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.
Lithology: sand; silt; clay or mud; gravel; sandstone; limestone; conglomerate; volcanic ash
Hickory Sandstone Member (Phanerozoic | Paleozoic | Cambrian-Middle) at surface, covers < 0.1 % of this area
Hickory Sandstone Member
Lithology: sandstone; sandstone; conglomerate
Riley Formation showing Lion Mountain Sandstone and Cap Mountain Limestone Members, undivided (Phanerozoic | Paleozoic | Cambrian-Middle) at surface, covers < 0.1 % of this area
Riley Formation showing Lion Mountain Sandstone and Cap Mountain Limestone Members, undivided
Lithology: limestone; sandstone; shale; siltstone
Wilberns Formation showing Point Peak, Morgan Creek Limestone, and Welge Sandstone Members, undivided (Phanerozoic | Paleozoic | Cambrian-Furongian) at surface, covers < 0.1 % of this area
Wilberns Formation showing Point Peak, Morgan Creek Limestone, and Welge Sandstone Members, undivided
Lithology: limestone; medium-grained mixed clastic; conglomerate; siltstone
Wilberns Formation showing San Saba Member (Phanerozoic | Paleozoic | Cambrian-Furongian) at surface, covers < 0.1 % of this area
Wilberns Formation showing San Saba Member
Lithology: dolostone (dolomite); limestone; sandstone
Bigford Formation (Phanerozoic | Cenozoic | Tertiary | Eocene) at surface, covers 0.2 % of this area
Bigford Formation
Lithology: siltstone; sandstone; clay or mud
Carizzo Sand (Phanerozoic | Cenozoic | Tertiary | Eocene) at surface, covers 0.5 % of this area
Carizzo Sand
Lithology: sandstone
Cadell Formation (Phanerozoic | Cenozoic | Tertiary | Eocene) at surface, covers 0.2 % of this area
Cadell Formation
Lithology: siltstone; clay or mud; sandstone; sand
Cook Mountain Formation (Phanerozoic | Cenozoic | Tertiary | Eocene) at surface, covers 0.6 % of this area
Cook Mountain Formation
Lithology: clay or mud; sandstone; coal
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 (Phanerozoic | Cenozoic | Tertiary | Eocene-Late) at surface, covers < 0.1 % 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
Lithology: rhyolite; trachyte; lava flow
El Pico Clay (Phanerozoic | Cenozoic | Tertiary | Eocene) at surface, covers 0.3 % of this area
El Pico Clay
Lithology: clay or mud; sandstone; coal
Hannold Hill Member of Tornillo Formation (Phanerozoic | Cenozoic | Tertiary | Eocene) at surface, covers < 0.1 % of this area
Hannold Hill Member of Tornillo Formation
Lithology: clay or mud; sandstone; conglomerate; coal
Eocene intrusive rocks (Phanerozoic | Cenozoic | Tertiary | Eocene) at surface, covers < 0.1 % of this area
Eocene intrusive rocks
Lithology: basalt; trachyte; felsic volcanic rock; rhyolite; phonolite; latite; trachyandesite
Infiernito caldera volcanic rocks including Capote Mountain Tuff, Tsh2 of Shely Group, Buckshot Ignimbrite, and Tm1 of Morita Ranch Formation (Phanerozoic | Cenozoic | Tertiary | Eocene-Late) 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
Lithology: trachyte; rhyolite; sandstone; trachyandesite; latite; trachybasalt; basalt; ash-flow tuff; mudstone; conglomerate
Manning, Wellborn, and Cadell Formations, undivided (Phanerozoic | Cenozoic | Tertiary | Eocene) at surface, covers < 0.1 % of this area
Manning, Wellborn, and Cadell Formations, undivided
Lithology: clay or mud; sandstone; siltstone; bentonite
Laredo Formation (Phanerozoic | Cenozoic | Tertiary | Eocene-Middle) at surface, covers 0.4 % of this area
Laredo Formation
Lithology: sandstone; clay or mud
Manning Formation (Phanerozoic | Cenozoic | Tertiary | Eocene) at surface, covers 0.3 % of this area
Manning Formation
Lithology: clay or mud; sand; bentonite; sandstone; siltstone; coal
Moodys Branch Formation (Phanerozoic | Cenozoic | Tertiary | Eocene-Late) at surface, covers < 0.1 % of this area
Moodys Branch Formation
Lithology: mudstone
Calvert Bluff Formation (Phanerozoic | Cenozoic | Tertiary | Paleocene Eocene) at surface, covers 0.3 % of this area
Calvert Bluff Formation
Lithology: mudstone; sandstone; coal
Indio Formation (Phanerozoic | Cenozoic | Tertiary | Paleocene Eocene) at surface, covers 0.1 % of this area
Indio Formation
Lithology: fine-grained mixed clastic; coal
Reklaw Formation, Carrizo Sand, and Wilcox and Midway Groups, undivided (Phanerozoic | Cenozoic | Tertiary | Paleocene Eocene) at surface, covers < 0.1 % of this area
Reklaw Formation, Carrizo Sand, and Wilcox and Midway Groups, undivided
Lithology: fine-grained mixed clastic; coal
Wilcox Group, undivided (Phanerozoic | Cenozoic | Tertiary | Paleocene Eocene) at surface, covers 0.8 % of this area
Wilcox Group, undivided
Lithology: fine-grained mixed clastic; coal; sand; clay or mud
Queen City Sand (Phanerozoic | Cenozoic | Tertiary | Eocene) at surface, covers 1 % of this area
Queen City Sand
Lithology: sandstone; siltstone; clay or mud; sand
Reklaw Formation (Phanerozoic | Cenozoic | Tertiary | Eocene) at surface, covers 0.5 % of this area
Reklaw Formation
Lithology: sandstone; clay or mud
Sparta Sand (Phanerozoic | Cenozoic | Tertiary | Eocene) at surface, covers 0.6 % of this area
Sparta Sand
Lithology: sand; clay or mud; silt; sandstone; coal
Eocene volcanic rocks (Phanerozoic | Cenozoic | Tertiary | Eocene) at surface, covers < 0.1 % of this area
Eocene volcanic rocks
Lithology: rhyolite
Van Horn Mountains caldera volcanic rocks (Phanerozoic | Cenozoic | Tertiary | Eocene) at surface, covers < 0.1 % of this area
Van Horn Mountains caldera volcanic rocks
Lithology: coarse-grained mixed clastic; trachyte; tuff; volcanic breccia (agglomerate); rhyolite; basalt; ignimbrite; andesite; hawaiite; vitrophyre
Weches Formation (Phanerozoic | Cenozoic | Tertiary | Eocene) at surface, covers 0.4 % of this area
Weches Formation
Lithology: sand; clay or mud
Wellborn Formation (Phanerozoic | Cenozoic | Tertiary | Eocene) at surface, covers 0.1 % of this area
Wellborn Formation
Lithology: sandstone; sand ; clay or mud; coal
Wiley Mountain caldera volcanic rocks (Phanerozoic | Cenozoic | Tertiary | Eocene) at surface, covers < 0.1 % of this area
Wiley Mountain caldera volcanic rocks
Lithology: trachyte; volcanic breccia (agglomerate); felsic volcanic rock; tuff
Yegua Formation (Phanerozoic | Cenozoic | Tertiary | Eocene-Middle) at surface, covers 1 % of this area
Yegua Formation
Lithology: clay or mud; sandstone; limestone; coal
Yazoo Formation (Phanerozoic | Cenozoic | Tertiary | Eocene-Late) at surface, covers < 0.1 % of this area
Yazoo Formation
Lithology: clay or mud
fill and spoil (Phanerozoic | Cenozoic | Quaternary | Holocene) at surface, covers < 0.1 % of this area
fill and spoil
Lithology: sand; silt; clay or mud
Malone Formation (Phanerozoic | Mesozoic | Jurassic-Late) at surface, covers < 0.1 % of this area
Malone Formation
Lithology: limestone; shale; siltstone; evaporite; sandstone; conglomerate
Morrison Formation (Phanerozoic | Mesozoic | Jurassic-Late) at surface, covers < 0.1 % of this area
Morrison Formation
Lithology: shale; sandstone
Cretaceous rocks, undivided (Phanerozoic | Mesozoic | Cretaceous-Late) at surface, covers < 0.1 % of this area
Cretaceous rocks, undivided
Lithology: limestone; shale; sandstone; mudstone
Antlers Sand (Phanerozoic | Mesozoic | Cretaceous-Early) at surface, covers 0.2 % of this area
Antlers Sand
Lithology: sand; clay or mud; conglomerate; sandstone; claystone
Anacacho Limestone (Phanerozoic | Mesozoic | Cretaceous-Late [Gulfian]) at surface, covers < 0.1 % of this area
Anacacho Limestone
Lithology: limestone; mudstone
Aguja Formation (Phanerozoic | Mesozoic | Cretaceous-Late) at surface, covers < 0.1 % of this area
Aguja Formation
Lithology: clay or mud; sandstone; coal
Annona Chalk (Phanerozoic | Mesozoic | Cretaceous-Late [Gulfian]) at surface, covers < 0.1 % of this area
Annona Chalk
Lithology: limestone
Austin Chalk (Phanerozoic | Mesozoic | Cretaceous-Late [Gulfian]) at surface, covers 0.8 % of this area
Austin Chalk
Lithology: limestone; mudstone; clay or mud; bentonite; mudstone
Benevides Formation (Phanerozoic | Mesozoic | Cretaceous-Early [Comanchean]) at surface, covers < 0.1 % of this area
Benevides Formation
Lithology: sandstone
Buda Limestone and San Martine Member of Borache Limestone, undivided (Phanerozoic | Mesozoic | Cretaceous-Late) at surface, covers < 0.1 % of this area
Buda Limestone and San Martine Member of Borache Limestone, undivided
Lithology: limestone; shale
Buda Limestone and Del Rio Clay, undivided (Phanerozoic | Mesozoic | Cretaceous-Late) at surface, covers 0.2 % of this area
Buda Limestone and Del Rio Clay, undivided
Lithology: limestone; mudstone; clay or mud; siltstone; shale
Buda Limestone and Eagle Mountain Sandstone, undivided (Phanerozoic | Mesozoic | Cretaceous-Late) at surface, covers < 0.1 % of this area
Buda Limestone and Eagle Mountain Sandstone, undivided
Lithology: limestone; sandstone; shale; mudstone
Benevides Formation and Finlay Limestone, undivided (Phanerozoic | Mesozoic | Cretaceous-Early [Comanchean]) at surface, covers < 0.1 % of this area
Benevides Formation and Finlay Limestone, undivided
Lithology: limestone; sandstone; shale
Boracho Limestone (Phanerozoic | Mesozoic | Cretaceous-Early) at surface, covers < 0.1 % of this area
Boracho Limestone
Lithology: limestone
Bissett Conglomerate (Phanerozoic | Mesozoic | Cretaceous-Early) at surface, covers < 0.1 % of this area
Bissett Conglomerate
Lithology: conglomerate; limestone; shale
Blossom Sand (Phanerozoic | Mesozoic | Cretaceous-Late [Gulfian]) at surface, covers < 0.1 % of this area
Blossom Sand
Lithology: sand; clay or mud
Bluff Mesa Formation (Phanerozoic | Mesozoic | Cretaceous-Early) at surface, covers < 0.1 % of this area
Bluff Mesa Formation
Lithology: limestone; sandstone; shale
Bonham Formation (Phanerozoic | Mesozoic | Cretaceous-Late [Gulfian]) at surface, covers < 0.1 % of this area
Bonham Formation
Lithology: mudstone; clay or mud
Bouquillas Formation (Phanerozoic | Mesozoic | Cretaceous-Late) at surface, covers 0.4 % of this area
Bouquillas Formation
Lithology: limestone; shale; mudstone; siltstone
Brownstown Marl (Phanerozoic | Mesozoic | Cretaceous-Late [Gulfian]) at surface, covers < 0.1 % of this area
Brownstown Marl
Lithology: clay or mud
Buda Limestone (Phanerozoic | Mesozoic | Cretaceous-Early) at surface, covers 0.3 % of this area
Buda Limestone
Lithology: limestone
Comanchean rocks, undivided (Phanerozoic | Mesozoic | Cretaceous-Early [Washita]) at surface, covers < 0.1 % of this area
Comanchean rocks, undivided
Lithology: limestone; shale; mudstone; clay or mud
Comanche Peak Limestone, Walnut Clay, and Antlers Sand, undivided (Phanerozoic | Mesozoic | Cretaceous-Early) at surface, covers < 0.1 % of this area
Comanche Peak Limestone, Walnut Clay, and Antlers Sand, undivided
Lithology: limestone; shale; fine-grained mixed clastic
Campagrande Formation (Phanerozoic | Mesozoic | Cretaceous-Early) at surface, covers < 0.1 % of this area
Campagrande Formation
Lithology: limestone; mudstone; sandstone; siltstone
Cow Creek Limestone, Hammett Shale, and Sycamore Sand, undivided (Phanerozoic | Mesozoic | Cretaceous-Early) at surface, covers < 0.1 % of this area
Cow Creek Limestone, Hammett Shale, and Sycamore Sand, undivided
Lithology: limestone; shale; fine-grained mixed clastic
Comanche Peak Limestone and Walnut Clay, undivided (Phanerozoic | Mesozoic | Cretaceous-Early) at surface, covers < 0.1 % of this area
Comanche Peak Limestone and Walnut Clay, undivided
Lithology: limestone; mixed clastic/carbonate
Cox Sandstone (Phanerozoic | Mesozoic | Cretaceous-Early) at surface, covers < 0.1 % of this area
Cox Sandstone
Lithology: mixed clastic/carbonate; limestone
Dakota Formation (Phanerozoic | Mesozoic | Cretaceous-Early Cretaceous-Late) at surface, covers < 0.1 % of this area
Dakota Formation
Lithology: sandstone; shale; coal
Duck Creek Limestone (Phanerozoic | Mesozoic | Cretaceous-Early [Comanchean]) at surface, covers < 0.1 % of this area
Duck Creek Limestone
Lithology: limestone
Del Rio Clay and Georgetown Limestone, undivided (Phanerozoic | Mesozoic | Cretaceous-Late [Gulfian] ) at surface, covers < 0.1 % of this area
Del Rio Clay and Georgetown Limestone, undivided
Lithology: clay or mud; limestone
Duck Creek Limestone and Kiamichi Formation, undivided (Phanerozoic | Mesozoic | Cretaceous-Early) at surface, covers < 0.1 % of this area
Duck Creek Limestone and Kiamichi Formation, undivided
Lithology: limestone; clay or mud
Del Carmen Limestone (Phanerozoic | Mesozoic | Cretaceous-Early ) at surface, covers < 0.1 % of this area
Del Carmen Limestone
Lithology: limestone
Dakota and Purgatoir Formations, undivided (Phanerozoic | Mesozoic | Cretaceous-Early) at surface, covers < 0.1 % of this area
Dakota and Purgatoir Formations, undivided
Lithology: sandstone; shale; coal
Del Rio Clay (Phanerozoic | Mesozoic | Cretaceous-Late) at surface, covers < 0.1 % of this area
Del Rio Clay
Lithology: mudstone; limestone
Devils River Limestone (Phanerozoic | Mesozoic | Cretaceous-Early [Comanchean]) at surface, covers 0.5 % of this area
Devils River Limestone
Lithology: limestone; dolostone (dolomite); chert
Edwards Limestone and Antlers Sand, undivided (Phanerozoic | Mesozoic | Cretaceous-Early) at surface, covers < 0.1 % of this area
Edwards Limestone and Antlers Sand, undivided
Lithology: sandstone; limestone; claystone
Eagle Ford Formation and Buda Limestone, undivided (Phanerozoic | Mesozoic | Cretaceous-Late) at surface, covers < 0.1 % of this area
Eagle Ford Formation and Buda Limestone, undivided
Lithology: fine-grained mixed clastic; limestone
Edwards and Comanche Peak Limestones, undivided (Phanerozoic | Mesozoic | Cretaceous-Early) at surface, covers < 0.1 % of this area
Edwards and Comanche Peak Limestones, undivided
Lithology: limestone; dolostone (dolomite); chert
Edwards Limestone (Phanerozoic | Mesozoic | Cretaceous-Early) at surface, covers 0.5 % of this area
Edwards Limestone
Lithology: limestone; dolostone (dolomite); chert
Eagle Ford Formation (Phanerozoic | Mesozoic | Cretaceous-Late) at surface, covers 0.4 % of this area
Eagle Ford Formation
Lithology: shale; siltstone; limestone
Fredericksberg Group and Maxon Sandstone, undivided (Phanerozoic | Mesozoic | Cretaceous-Early [Comanchean]) at surface, covers < 0.1 % of this area
Fredericksberg Group and Maxon Sandstone, undivided
Lithology: sandstone; limestone; dolostone (dolomite)
Ector Chalk (Phanerozoic | Mesozoic | Cretaceous-Late [Gulfian]) at surface, covers < 0.1 % of this area
Ector Chalk
Lithology: limestone
Escondido Formation (Phanerozoic | Mesozoic | Cretaceous-Late [Gulfian]) at surface, covers 0.2 % of this area
Escondido Formation
Lithology: shale; siltstone; sandstone
Etholen Conglomerate (Phanerozoic | Mesozoic | Cretaceous-Early) at surface, covers < 0.1 % of this area
Etholen Conglomerate
Lithology: conglomerate; shale; limestone
Eagle Ford Formation and Woodbine Formations, undivided (Phanerozoic | Mesozoic | Cretaceous-Late [Gulfian]) at surface, covers < 0.1 % of this area
Eagle Ford Formation and Woodbine Formations, undivided
Lithology: shale; sand; clay or mud; limestone; coal; tuff
Espy Formation (Phanerozoic | Mesozoic | Cretaceous-Early) at surface, covers < 0.1 % of this area
Espy Formation
Lithology: limestone; shale; sandstone
Finlay Limestone (Phanerozoic | Mesozoic | Cretaceous-Early [Comanchean Albian]) at surface, covers 0.1 % of this area
Finlay Limestone
Lithology: limestone; siltstone; sandstone
Fort Worth Limestone and Duck Creek Formation, undivided (Phanerozoic | Mesozoic | Cretaceous-Early) at surface, covers 0.2 % of this area
Fort Worth Limestone and Duck Creek Formation, undivided
Lithology: limestone; mudstone; clay or mud
Fredericksburg Group (Phanerozoic | Mesozoic | Cretaceous-Early [Comanchean]) at surface, covers 0.2 % of this area
Fredericksburg Group
Lithology: limestone; mudstone; dolostone (dolomite); chert
undivided part Fredericksberg Group (Phanerozoic | Mesozoic | Cretaceous-Early) at surface, covers 0.1 % of this area
undivided part Fredericksberg Group
Lithology: clay or mud; limestone; mudstone; shale
Gulfian rocks, undivided (Phanerozoic | Mesozoic | Cretaceous-Late) at surface, covers < 0.1 % of this area
Gulfian rocks, undivided
Lithology: mudstone; shale; limestone
Gober Chalk and Roxton Limestone (Phanerozoic | Mesozoic | Cretaceous-Late [Gulfian]) at surface, covers 0.1 % of this area
Gober Chalk and Roxton Limestone
Lithology: limestone; limestone
Grayson Marl and Main Street Limestone, undivided (Phanerozoic | Mesozoic | Cretaceous-Early Cretaceous-Late) at surface, covers 0.2 % of this area
Grayson Marl and Main Street Limestone, undivided
Lithology: mudstone; limestone
Glen Rose Limestone (Phanerozoic | Mesozoic | Cretaceous-Early) at surface, covers 0.3 % of this area
Glen Rose Limestone
Lithology: limestone; clay or mud; sandstone; conglomerate
Georgetown Limestone (Phanerozoic | Mesozoic | Cretaceous-Early) at surface, covers < 0.1 % of this area
Georgetown Limestone
Lithology: limestone; mudstone
Goodland Limestone and Walnut Clay, undivided (Phanerozoic | Mesozoic | Cretaceous-Early [Comanchean]) at surface, covers < 0.1 % of this area
Goodland Limestone and Walnut Clay, undivided
Lithology: limestone; clay or mud
Hensell Sand (Phanerozoic | Mesozoic | Cretaceous-Early [Comanchean) at surface, covers 0.2 % of this area
Hensell Sand
Lithology: limestone; sand; conglomerate; shale
igneous rocks of Austin age (Phanerozoic | Mesozoic | Cretaceous-Late) at surface, covers < 0.1 % of this area
igneous rocks of Austin age
Lithology: basalt; pyroclastic
Kemp clay and Corsicana Marl, undivided (Phanerozoic | Mesozoic | Cretaceous-Late [Gulfian]) at surface, covers < 0.1 % of this area
Kemp clay and Corsicana Marl, undivided
Lithology: clay or mud; sandstone
Kemp clay (Phanerozoic | Mesozoic | Cretaceous-Late [Gulfian]) at surface, covers < 0.1 % of this area
Kemp clay
Lithology: clay or mud; sandstone
Kiamichi Formation (Phanerozoic | Mesozoic | Cretaceous-Early [Comanchean]) at surface, covers < 0.1 % of this area
Kiamichi Formation
Lithology: clay or mud; limestone; sandstone
Loma Plata Formation (Phanerozoic | Mesozoic | Cretaceous-Early [Comanchean]) at surface, covers < 0.1 % of this area
Loma Plata Formation
Lithology: limestone; shale
Marlbrook Marl (Phanerozoic | Mesozoic | Cretaceous-Late [Gulfian]) at surface, covers 0.1 % of this area
Marlbrook Marl
Lithology: clay or mud; limestone
McKnight Formation (Phanerozoic | Mesozoic | Cretaceous-Early ) at surface, covers < 0.1 % of this area
McKnight Formation
Lithology: limestone; shale; chert
Navarro Group, undivided (Phanerozoic | Mesozoic | Cretaceous-Late [Gulfian]) at surface, covers < 0.1 % of this area
Navarro Group, undivided
Lithology: clay or mud; sand; sandstone
Navarro Group and Marlbrook Marl, undivided (Phanerozoic | Mesozoic | Cretaceous-Late [Gulfian]) at surface, covers 0.1 % of this area
Navarro Group and Marlbrook Marl, undivided
Lithology: clay or mud; fine-grained mixed clastic; sandstone; sand
Neylandville Marl (Phanerozoic | Mesozoic | Cretaceous-Late [Gulfian]) at surface, covers < 0.1 % of this area
Neylandville Marl
Lithology: clay or mud
Neylandville and Marlbrook Marls, undivided (Phanerozoic | Mesozoic | Cretaceous-Late [Gulfian]) at surface, covers 0.2 % of this area
Neylandville and Marlbrook Marls, undivided
Lithology: clay or mud
Nacatoch Sand (Phanerozoic | Mesozoic | Cretaceous-Late [Gulfian]) at surface, covers < 0.1 % of this area
Nacatoch Sand
Lithology: clay or mud; sand; sandstone
Navarro and Taylor Groups, undivided (Phanerozoic | Mesozoic | Cretaceous-Late [Gulfian]) at surface, covers < 0.1 % of this area
Navarro and Taylor Groups, undivided
Lithology: clay or mud; fine-grained mixed clastic; sandstone; limestone
Ozan Formation (Phanerozoic | Mesozoic | Cretaceous-Late [Gulfian]) at surface, covers 0.4 % of this area
Ozan Formation
Lithology: clay or mud
Ojinaga Formation (Phanerozoic | Mesozoic | Cretaceous-Late) at surface, covers < 0.1 % of this area
Ojinaga Formation
Lithology: shale; sandstone; limestone
Olmos Formation (Phanerozoic | Mesozoic | Cretaceous-Late [Gulfian]) at surface, covers < 0.1 % of this area
Olmos Formation
Lithology: clay or mud; sandstone; coal
Pen Formation (Phanerozoic | Mesozoic | Cretaceous-Late) at surface, covers < 0.1 % of this area
Pen Formation
Lithology: clay or mud; sandstone
Paluxy Sand (Phanerozoic | Mesozoic | Cretaceous-Early) at surface, covers < 0.1 % of this area
Paluxy Sand
Lithology: sand; sandstone; limestone
Pawpaw Formation, Weno Limestone, and Denton Clay, undivided (Phanerozoic | Mesozoic | Cretaceous-Early) at surface, covers 0.1 % of this area
Pawpaw Formation, Weno Limestone, and Denton Clay, undivided
Lithology: mudstone; limestone; clay or mud
Pecan Gap Chalk (Phanerozoic | Mesozoic | Cretaceous-Late [Gulfian]) at surface, covers 0.2 % of this area
Pecan Gap Chalk
Lithology: limestone; sand; clay or mud; limestone
Paluxy Sand and Glen Rose Limestone, undivided (Phanerozoic | Mesozoic | Cretaceous-Early) at surface, covers 0.2 % of this area
Paluxy Sand and Glen Rose Limestone, undivided
Lithology: sandstone; limestone; claystone
El Picacho Formation (Phanerozoic | Mesozoic | Cretaceous-Late) at surface, covers < 0.1 % of this area
El Picacho Formation
Lithology: claystone; sandstone; coal
Presidio Formation (Phanerozoic | Mesozoic | Cretaceous-Early [Aptian Albian]) at surface, covers < 0.1 % of this area
Presidio Formation
Lithology: conglomerate; sandstone; siltstone
Sue Peaks Formation, Del Carmen Limestone, and Telephone Canyon Formation, undivided (Phanerozoic | Mesozoic | Cretaceous-Early) at surface, covers < 0.1 % of this area
Sue Peaks Formation, Del Carmen Limestone, and Telephone Canyon Formation, undivided
Lithology: limestone; shale
Pawpaw Formation and upper limestone unit of Weno Formation, undivided (Phanerozoic | Mesozoic | Cretaceous-Early) at surface, covers < 0.1 % of this area
Pawpaw Formation and upper limestone unit of Weno Formation, undivided
Lithology: mudstone; limestone
Salmon Peak Limestone (Phanerozoic | Mesozoic | Cretaceous-Early) at surface, covers < 0.1 % of this area
Salmon Peak Limestone
Lithology: limestone; mudstone; chert
San Carlos Sandstone (Phanerozoic | Mesozoic | Cretaceous-Late) at surface, covers < 0.1 % of this area
San Carlos Sandstone
Lithology: sandstone; coal
Santa Elena Limestone (Phanerozoic | Mesozoic | Cretaceous-Early) at surface, covers 0.3 % of this area
Santa Elena Limestone
Lithology: limestone; mudstone; chert
Shafter Formation (Phanerozoic | Mesozoic | Cretaceous-Early) at surface, covers < 0.1 % of this area
Shafter Formation
Lithology: mixed clastic/carbonate; sandstone
San Miguel Formation (Phanerozoic | Mesozoic | Cretaceous-Late [Gulfian]) at surface, covers < 0.1 % of this area
San Miguel Formation
Lithology: sandstone; limestone; clay or mud
Santa Elena Limestone, Sue Peaks Formation, Del Carmen Limestone, and Telephone Canyon Formation, undivided (Phanerozoic | Mesozoic | Cretaceous-Early) at surface, covers < 0.1 % of this area
Santa Elena Limestone, Sue Peaks Formation, Del Carmen Limestone, and Telephone Canyon Formation, undivided
Lithology: limestone; shale
Sue Peaks Formation (Phanerozoic | Mesozoic | Cretaceous-Early) at surface, covers < 0.1 % of this area
Sue Peaks Formation
Lithology: limestone; shale; mudstone
Maxon Sandstone and Glen Rose Limestone, undivided (Phanerozoic | Mesozoic | Cretaceous-Early) at surface, covers < 0.1 % of this area
Maxon Sandstone and Glen Rose Limestone, undivided
Lithology: sandstone; limestone
Twin Mountains Formation (Phanerozoic | Mesozoic | Cretaceous-Early) at surface, covers 0.1 % of this area
Twin Mountains Formation
Lithology: sandstone; claystone; conglomerate
Torcer Formation (Phanerozoic | Mesozoic | Cretaceous-Early) at surface, covers < 0.1 % of this area
Torcer Formation
Lithology: limestone; shale; mudstone; clay or mud
Travis Peak Formation (Phanerozoic | Mesozoic | Cretaceous-Early) at surface, covers 0.1 % of this area
Travis Peak Formation
Lithology: conglomerate; sandstone; limestone
upper Cretaceous rocks, undivided (Phanerozoic | Mesozoic | Cretaceous-Late) at surface, covers < 0.1 % of this area
upper Cretaceous rocks, undivided
Lithology: limestone; shale; mudstone; sandstone; clay or mud; sand; fine-grained mixed clastic; medium-grained mixed clastic; coarse-grained mixed clastic; mixed clastic/carbonate
Upson Clay (Phanerozoic | Mesozoic | Cretaceous-Late [Gulfian]) at surface, covers < 0.1 % of this area
Upson Clay
Lithology: clay or mud
Washita Group (Phanerozoic | Mesozoic | Cretaceous-Early [Comanchean] Cretaceous-Late ) at surface, covers 0.2 % of this area
Washita Group
Lithology: clay or mud; limestone
Walnut Clay (Phanerozoic | Mesozoic | Cretaceous-Early) at surface, covers 0.1 % of this area
Walnut Clay
Lithology: clay or mud; limestone; shale
Woodbine Formation (Phanerozoic | Mesozoic | Cretaceous-Late [Gulfian]) at surface, covers 0.4 % of this area
Woodbine Formation
Lithology: shale; sand; clay or mud; limestone; coal; tuff
Wolfe City Formation (Phanerozoic | Mesozoic | Cretaceous-Late [Gulfian]) at surface, covers 0.2 % of this area
Wolfe City Formation
Lithology: sand; silt; mudstone
undivided parts of Washita and Fredericksberg Groups (Phanerozoic | Mesozoic | Cretaceous-Early) at surface, covers < 0.1 % of this area
undivided parts of Washita and Fredericksberg Groups
Lithology: clay or mud; limestone; mudstone; shale
Washita and Fredericksburg Groups, undivided (Phanerozoic | Mesozoic | Cretaceous-Early [Comanchean]) at surface, covers < 0.1 % of this area
Washita and Fredericksburg Groups, undivided
Lithology: clay or mud; limestone; dolostone (dolomite); chert
lower part of Washita Group (Phanerozoic | Mesozoic | Cretaceous-Early [Comanchean]) at surface, covers < 0.1 % of this area
lower part of Washita Group
Lithology: limestone; mudstone
West Nueces Formation (Phanerozoic | Mesozoic | Cretaceous-Early [Comanchean]) at surface, covers < 0.1 % of this area
West Nueces Formation
Lithology: limestone
undivided part of Washita Group (Phanerozoic | Mesozoic | Cretaceous-Early [Comanchean]) at surface, covers < 0.1 % of this area
undivided part of Washita Group
Lithology: clay or mud; limestone; mudstone
Yearwood Formation (Phanerozoic | Mesozoic | Cretaceous-Early) at surface, covers < 0.1 % of this area
Yearwood Formation
Lithology: limestone; shale; conglomerate
Yucca Formation (Phanerozoic | Mesozoic | Cretaceous-Early) at surface, covers < 0.1 % of this area
Yucca Formation
Lithology: conglomerate; sandstone; siltstone
Barnett Formation, Chappel Limestone, Houy, Zesch, Bear Spring, and Stribling Formations, and Pillar Bluff Limestone, undivided (Phanerozoic | Paleozoic | Devonian Carboniferous Mississippian-Early Mississippian-Middle Mississippian-Late) at surface, covers < 0.1 % of this area
Barnett Formation, Chappel Limestone, Houy, Zesch, Bear Spring, and Stribling Formations, and Pillar Bluff Limestone, undivided
Lithology: limestone; shale; phosphorite; dolostone (dolomite); chert
Caballos Novaculite and Maravillas Chert, undivided (Phanerozoic | Paleozoic | Ordovician-Late Devonian Carboniferous Mississippian) at surface, covers < 0.1 % of this area
Caballos Novaculite and Maravillas Chert, undivided
Lithology: chert; novaculite; limestone; shale
Helms Shale, Rancheria Formation, Las Cruces Limestone, Percha Shale, and Canutillo Formations, undivided (Phanerozoic | Paleozoic | Devonian Carboniferous Mississippian-Late [Chesteran]) at surface, covers < 0.1 % of this area
Helms Shale, Rancheria Formation, Las Cruces Limestone, Percha Shale, and Canutillo Formations, undivided
Lithology: limestone; shale; chert; sandstone
Mississippi, Devonian, and Ordovician rocks, undivided (Phanerozoic | Paleozoic | Ordovician Devonian Carboniferous Mississippian) at surface, covers < 0.1 % of this area
Mississippi, Devonian, and Ordovician rocks, undivided
Lithology: novaculite; limestone; chert; shale
Black Gap area volcanic rocks (Phanerozoic | Cenozoic | Tertiary | Miocene) at surface, covers < 0.1 % of this area
Black Gap area volcanic rocks
Lithology: tuff; basalt
Fleming Formation (Phanerozoic | Cenozoic | Tertiary | Miocene) at surface, covers 0.7 % of this area
Fleming Formation
Lithology: clay or mud; sandstone
Fleming Formation and Oakville Sandstone, undivided (Phanerozoic | Cenozoic | Tertiary | Miocene) at surface, covers < 0.1 % of this area
Fleming Formation and Oakville Sandstone, undivided
Lithology: clay or mud; sandstone
Goliad Formation (Phanerozoic | Cenozoic | Tertiary | Miocene) at surface, covers 0.8 % of this area
Goliad Formation
Lithology: clay or mud; sandstone; mudstone; carbonate; limestone; conglomerate
Miocene intrusive rocks (Phanerozoic | Cenozoic | Tertiary | Miocene) at surface, covers < 0.1 % of this area
Miocene intrusive rocks
Lithology: basalt
Oakville Sandstone (Phanerozoic | Cenozoic | Tertiary | Miocene) at surface, covers 0.3 % of this area
Oakville Sandstone
Lithology: sandstone; clay or mud
Tarantula Gravel (Phanerozoic | Cenozoic | Tertiary | Miocene) at surface, covers < 0.1 % of this area
Tarantula Gravel
Lithology: gravel; tuff; trachyte; basalt; ignimbrite; quartzite; limestone
Ordovician rocks, undivided (Phanerozoic | Paleozoic| Ordovician) at surface, covers < 0.1 % of this area
Ordovician rocks, undivided
Lithology: limestone; shale
Woods Hollow Shale, Fort Pena Formation, Alsate Shale, Marathon Limestone, and Dagger Flat Sandstone, undivided (Phanerozoic | Paleozoic| Cambrian Ordovician) at surface, covers < 0.1 % of this area
Woods Hollow Shale, Fort Pena Formation, Alsate Shale, Marathon Limestone, and Dagger Flat Sandstone, undivided
Lithology: mixed clastic/carbonate; chert; conglomerate
El Paso Formation and Bliss Sandstone, undivided (Phanerozoic | Paleozoic| Cambrian-Furongian(?) Ordovician-Early) at surface, covers < 0.1 % of this area
El Paso Formation and Bliss Sandstone, undivided
Lithology: limestone; dolostone (dolomite); sandstone; conglomerate
Gorman Formation (Phanerozoic | Paleozoic| Ordovician-Early) at surface, covers < 0.1 % of this area
Gorman Formation
Lithology: limestone; dolostone (dolomite)
Catahoula Formation (Phanerozoic | Cenozoic | Tertiary | Oligocene) at surface, covers 0.4 % of this area
Catahoula Formation
Lithology: mudstone; sand; tuff; sandstone; conglomerate
Catahoula Formation and Frio Clay, undivided (Phanerozoic | Cenozoic | Tertiary | Oligocene) at surface, covers < 0.1 % of this area
Catahoula Formation and Frio Clay, undivided
Lithology: clay or mud; mudstone; tuff; sandstone; sand; conglomerate
Chinati Mountains caldera volcanic rocks, including Chinati Mountains Group, Mitchell Mesa Ignimbrite, and type area of Petan Basalt (Phanerozoic | Cenozoic | Tertiary | 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
Lithology: rhyolite; basalt; ash-flow tuff; volcanic breccia (agglomerate); quartz monzonite; trachyte; andesite; dacite
younger volcanic rocks of Davis Mountains area including Brooks Mountain, Goat Canyon, Medley, Barrel Springs, Wild Cherry, Eppenaurer Ranch, Mount Locke, and Merrill Formations (Phanerozoic | Cenozoic | Tertiary | Oligocene-Early) 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
Lithology: trachyte; rhyolite; tuff; latite
Duff Formation, Decie Member from Paisano caldera (Phanerozoic | Cenozoic | Tertiary | Oligocene-Early) at surface, covers < 0.1 % of this area
Duff Formation, Decie Member from Paisano caldera
Lithology: rhyolite; trachyte; tuff; conglomerate
Eagle Mountains caldera volcanic rocks (Phanerozoic | Cenozoic | Tertiary | Oligocene) at surface, covers < 0.1 % of this area
Eagle Mountains caldera volcanic rocks
Lithology: rhyolite; trachyte; conglomerate; tuff; volcanic breccia (agglomerate)
Chisos Formation of Schiebout et al (1987) and the Big Yellow Sandstone Member of their Tornillo Formation, undivided (Phanerozoic | Cenozoic | Tertiary | Eocene 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
Lithology: sandstone; mudstone; tuff; conglomerate; mixed clastic/volcanic; basalt; trachyandesite
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 (Phanerozoic | Cenozoic | Tertiary | Eocene-Late Oligocene-Early) at surface, covers 0.1 % 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
Lithology: rhyolite; basalt; tuff; sandstone; conglomerate; limestone
Devils Graveyard volcanic rocks (Phanerozoic | Cenozoic | Tertiary | Eocene Oligocene) at surface, covers < 0.1 % of this area
Devils Graveyard volcanic rocks
Lithology: tuff; basalt
Jackson Group, undivided (Phanerozoic | Cenozoic | Tertiary | Eocene Oligocene) at surface, covers 0.5 % of this area
Jackson Group, undivided
Lithology: clay or mud; sandstone; siltstone
Vieja Group, including Bracks Rhyolite, Chambers and Colmena Tuffs and Gill Breccia (Phanerozoic | Cenozoic | Tertiary | Eocene Oligocene) at surface, covers < 0.1 % of this area
Vieja Group, including Bracks Rhyolite, Chambers and Colmena Tuffs and Gill Breccia
Lithology: rhyolite; sandstone; ash-flow tuff; breccia; conglomerate
Whitsett Formation (Phanerozoic | Cenozoic | Tertiary | Eocene Oligocene) at surface, covers 0.2 % of this area
Whitsett Formation
Lithology: clay or mud; sandstone; siltstone; sand
Frio Clay (Phanerozoic | Cenozoic | Tertiary | Oligocene) at surface, covers < 0.1 % of this area
Frio Clay
Lithology: clay or mud
Oligocene intrusive rocks (Phanerozoic | Cenozoic | Tertiary | Oligocene) at surface, covers < 0.1 % of this area
Oligocene intrusive rocks
Lithology: basalt; trachyte; felsic volcanic rock; rhyolite; phonolite; latite; trachyandesite
Jones Basalt (Phanerozoic | Cenozoic | Tertiary | Oligocene) at surface, covers < 0.1 % of this area
Jones Basalt
Lithology: basalt; trachyandesite
Tm2 and Tm3 units of Morita Ranch Formation (possibly from Cienega Mountain area) (Phanerozoic | Cenozoic | Tertiary | Oligocene) at surface, covers < 0.1 % of this area
Tm2 and Tm3 units of Morita Ranch Formation (possibly from Cienega Mountain area)
Lithology: basalt; trachyte
Nash Creek Formation (Phanerozoic | Cenozoic | Tertiary | Oligocene) at surface, covers < 0.1 % of this area
Nash Creek Formation
Lithology: indeterminate
Perdiz Conglomerate, Tascotal Formation, and tuffaceous sediments of Fresno Formation (Phanerozoic | Cenozoic | Tertiary | Oligocene) at surface, covers < 0.1 % of this area
Perdiz Conglomerate, Tascotal Formation, and tuffaceous sediments of Fresno Formation
Lithology: sandstone; conglomerate; ash-flow tuff; mudstone
Quitman Mountains caldera volcanic rocks and volcanic rocks of sneed (Cox) Mountain and west of Victorio Peak (Phanerozoic | Cenozoic | Tertiary | 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
Lithology: trachyte; rhyolite; felsic volcanic rock; basalt
Bofecillos volcano volcanic rocks, including units 1-8 of Rawls Formation and lava flows in upper part of Fresno Formation (Phanerozoic | Cenozoic | Tertiary | 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
Lithology: basalt; trachyte; felsic volcanic rock; rhyolite
South Rim Formation from Pine Canyon Caldera (Phanerozoic | Cenozoic | Tertiary | Oligocene) at surface, covers < 0.1 % of this area
South Rim Formation from Pine Canyon Caldera
Lithology: rhyolite; ash-flow tuff; lava flow; volcanic breccia (agglomerate); vitrophyre
Santana Tuff from Sierra Rica caldera in Mexico (Phanerozoic | Cenozoic | Tertiary | Oligocene) at surface, covers < 0.1 % of this area
Santana Tuff from Sierra Rica caldera in Mexico
Lithology: ash-flow tuff
San Carlos Tuff from San Carlos caldera in Mexico (Phanerozoic | Cenozoic | Tertiary | Oligocene) at surface, covers < 0.1 % of this area
San Carlos Tuff from San Carlos caldera in Mexico
Lithology: ash-flow tuff
upper part of Shely Group, including Tm4 or Morita Ranch Formation (Phanerozoic | Cenozoic | Tertiary | Oligocene) at surface, covers < 0.1 % of this area
upper part of Shely Group, including Tm4 or Morita Ranch Formation
Lithology: rhyolite; basalt
Honeycut Formation (Phanerozoic | Paleozoic | Ordovician-Early) at surface, covers < 0.1 % of this area
Honeycut Formation
Lithology: dolostone (dolomite); limestone
Montoya Dolomite (Phanerozoic | Paleozoic | Ordovician-Middle Ordovician-Late) at surface, covers < 0.1 % of this area
Montoya Dolomite
Lithology: dolostone (dolomite); limestone; sandstone
Tanyard Formation (Phanerozoic | Paleozoic | Ordovician-Early) at surface, covers 0.1 % of this area
Tanyard Formation
Lithology: limestone; dolostone (dolomite)
Permian rocks, undivided (Phanerozoic | Paleozoic | Permian) at surface, covers < 0.1 % of this area
Permian rocks, undivided
Lithology: shale; sandstone; evaporite; dolostone (dolomite); siltstone
Alta Formation (Phanerozoic | Paleozoic | Permian [Wolfcamp]) at surface, covers < 0.1 % of this area
Alta Formation
Lithology: sandstone; shale
Brazos River Formation (Phanerozoic | Paleozoic | Carboniferous Pennsylvanian [Des Moines]) at surface, covers < 0.1 % of this area
Brazos River Formation
Lithology: sandstone; conglomerate
Archer City Formation (Phanerozoic | Paleozoic | Permian [Wolfcamp]) at surface, covers 0.2 % of this area
Archer City Formation
Lithology: mudstone; sandstone; siltstone; conglomerate
Cedarton Shale and Adams Branch Limestone, undivided (Phanerozoic | Paleozoic | Carboniferous Pennsylvanian [Missouri]) at surface, covers < 0.1 % of this area
Cedarton Shale and Adams Branch Limestone, undivided
Lithology: shale; sandstone; limestone
Cienequita Formation (Phanerozoic | Paleozoic | Carboniferous Pennsylvanian-Middle Pennsylvanian-Late) at surface, covers < 0.1 % of this area
Cienequita Formation
Lithology: coarse-grained mixed clastic; sedimentary breccia; black shale; hornfels
Canyon Group, undivided (Phanerozoic | Paleozoic | Carboniferous Pennsylvanian-Late [Missouri]) at surface, covers < 0.1 % of this area
Canyon Group, undivided
Lithology: fine-grained mixed clastic; medium-grained mixed clastic; limestone
Chico Ridge Limestone (Phanerozoic | Paleozoic | Carboniferous Pennsylvanian [Missouri]) at surface, covers < 0.1 % of this area
Chico Ridge Limestone
Lithology: limestone
Admiral Formation (Phanerozoic | Paleozoic | Permian [Wolfcamp]) at surface, covers 0.1 % of this area
Admiral Formation
Lithology: mudstone; limestone; sandstone
Dimple Formation (Phanerozoic | Paleozoic | Carboniferous Pennsylvanian-Early) at surface, covers < 0.1 % of this area
Dimple Formation
Lithology: limestone; shale
Grindstone Creek Formation, expanded (Phanerozoic | Paleozoic | Carboniferous Pennsylvanian [Des Moines]) at surface, covers < 0.1 % of this area
Grindstone Creek Formation, expanded
Lithology: shale; sandstone; limestone
Gaptank Formation (Phanerozoic | Paleozoic | Carboniferous Pennsylvanian-Early Pennsylvanian-Middle Pennsylvanian-Late) at surface, covers < 0.1 % of this area
Gaptank Formation
Lithology: fine-grained mixed clastic; limestone; conglomerate
Haymond Formation (Phanerozoic | Paleozoic | Carboniferous Pennsylvanian-Early) at surface, covers < 0.1 % of this area
Haymond Formation
Lithology: medium-grained mixed clastic; fine-grained mixed clastic; conglomerate; arkose
Home Creek Limestone and Colony Creek Shale, undivided (Phanerozoic | Paleozoic | Carboniferous Pennsylvanian [Missouri]) at surface, covers < 0.1 % of this area
Home Creek Limestone and Colony Creek Shale, undivided
Lithology: shale; limestone; sandstone
Admiral and Coleman Junction Formations, undivided (Phanerozoic | Paleozoic | Permian [Wolfcamp]) at surface, covers < 0.1 % of this area
Admiral and Coleman Junction Formations, undivided
Lithology: mudstone; shale; sandstone; limestone
Jasper Creek Formation (Phanerozoic | Paleozoic | Carboniferous Pennsylvanian-Late [Missouri]) at surface, covers < 0.1 % of this area
Jasper Creek Formation
Lithology: fine-grained mixed clastic
Lazy Bend Formation (Phanerozoic | Paleozoic | Carboniferous Pennsylvanian [Des Moines]) at surface, covers < 0.1 % of this area
Lazy Bend Formation
Lithology: shale; sandstone; limestone
Mingus Formation (Phanerozoic | Paleozoic | Carboniferous Pennsylvanian [Des Moines]) at surface, covers < 0.1 % of this area
Mingus Formation
Lithology: shale; sandstone; limestone; coal
Marble Falls Limestone (Phanerozoic | Paleozoic | Carboniferous Pennsylvanian [Morrow]) at surface, covers < 0.1 % of this area
Marble Falls Limestone
Lithology: limestone; shale
Tesnus Formation (Phanerozoic | Paleozoic | Carboniferous Mississippian-Late Pennsylvanian-Early) at surface, covers < 0.1 % of this area
Tesnus Formation
Lithology: medium-grained mixed clastic; fine-grained mixed clastic; chert; arkose; conglomerate
Mineral Wells Formation (Phanerozoic | Paleozoic | Carboniferous Pennsylvanian [Missouri]) at surface, covers < 0.1 % of this area
Mineral Wells Formation
Lithology: sandstone; limestone; conglomerate; shale
pre-Brazos River rocks, undivided (Phanerozoic | Paleozoic | Carboniferous Pennsylvanian [Des Moines]) at surface, covers < 0.1 % of this area
pre-Brazos River rocks, undivided
Lithology: mudstone; sandstone; limestone
Palo Pinto Formation (Phanerozoic | Paleozoic | Carboniferous Pennsylvanian [Missouri]) at surface, covers < 0.1 % of this area
Palo Pinto Formation
Lithology: sandstone; shale; limestone
Ranger Limestone (Phanerozoic | Paleozoic | Carboniferous Pennsylvanian [Missouri]) at surface, covers < 0.1 % of this area
Ranger Limestone
Lithology: limestone; shale
Ranger Limestone and Placid Creek Shale, undivided (Phanerozoic | Paleozoic | Carboniferous Pennsylvanian [Missouri]) at surface, covers < 0.1 % of this area
Ranger Limestone and Placid Creek Shale, undivided
Lithology: shale; limestone
Strawn Group (Phanerozoic | Paleozoic | Carboniferous Pennsylvanian-Middle [Atoka Des Moines]) at surface, covers < 0.1 % of this area
Strawn Group
Lithology: shale; sandstone; clay or mud; sandstone; conglomerate; coal
Smithwick Formation (Phanerozoic | Paleozoic | Carboniferous Pennsylvanian-Middle [Atoka]) at surface, covers < 0.1 % of this area
Smithwick Formation
Lithology: fine-grained mixed clastic; limestone; shale; sandstone; conglomerate
Thrifty and Graham Formations, undivided (Phanerozoic | Paleozoic | Carboniferous Pennsylvanian-Late [Virgil]) at surface, covers 0.1 % of this area
Thrifty and Graham Formations, undivided
Lithology: shale; sandstone; limestone; mudstone; conglomerate
unnamed Pennsylvanian rocks (Phanerozoic | Paleozoic | Carboniferous Pennsylvanian) at surface, covers < 0.1 % of this area
unnamed Pennsylvanian rocks
Lithology: shale; limestone; sandstone
Ventioner Formation (Phanerozoic | Paleozoic | Carboniferous Pennsylvanian [Missouri]) at surface, covers < 0.1 % of this area
Ventioner Formation
Lithology: fine-grained mixed clastic; medium-grained mixed clastic; limestone
Winchell Limestone (Phanerozoic | Paleozoic | Carboniferous Pennsylvanian [Missouri]) at surface, covers < 0.1 % of this area
Winchell Limestone
Lithology: limestone; shale
Wolf Mountain Shale (Phanerozoic | Paleozoic | Carboniferous Pennsylvanian [Missouri]) at surface, covers < 0.1 % of this area
Wolf Mountain Shale
Lithology: shale; sandstone; limestone
Willow Point Formation (Phanerozoic | Paleozoic | Carboniferous Pennsylvanian-Late [Missouri]) at surface, covers < 0.1 % of this area
Willow Point Formation
Lithology: limestone
Blaine Formation (Phanerozoic | Paleozoic | Permian [Guadalupe]) at surface, covers 0.5 % of this area
Blaine Formation
Lithology: mudstone; evaporite; dolostone (dolomite); sandstone
Bell Canyon, Cherry Canyon, and Brushy Canyon Formations undivided (Phanerozoic | Paleozoic | Permian [Guadalupe]) at surface, covers < 0.1 % of this area
Bell Canyon, Cherry Canyon, and Brushy Canyon Formations undivided
Lithology: sandstone; limestone; siltstone
Bell Canyon Formation (Phanerozoic | Paleozoic | Permian [Guadalupe]) at surface, covers 0.1 % of this area
Bell Canyon Formation
Lithology: sandstone; limestone
Bead Mountain Formation (Phanerozoic | Paleozoic | Permian [Leonard]) at surface, covers < 0.1 % of this area
Bead Mountain Formation
Lithology: shale; limestone
Briggs Formation (Phanerozoic | Paleozoic | Permian [Leonard]) at surface, covers < 0.1 % of this area
Briggs Formation
Lithology: evaporite; dolostone (dolomite)
Brushy Canyon Formation (Phanerozoic | Paleozoic | Permian [Guadalupe]) at surface, covers < 0.1 % of this area
Brushy Canyon Formation
Lithology: sandstone; limestone; shale; chert; conglomerate
Bone Spring Formation (Phanerozoic | Paleozoic | Permian [Leonard]) at surface, covers < 0.1 % of this area
Bone Spring Formation
Lithology: limestone; dolostone (dolomite); sandstone
Capitan Formation (Phanerozoic | Paleozoic | Permian [Guadalupe]) at surface, covers < 0.1 % of this area
Capitan Formation
Lithology: limestone; dolostone (dolomite)
Allamore Formation (preCambrian-Proterozoic [Grenville]) at surface, covers < 0.1 % of this area
Allamore Formation
Lithology: limestone; conglomerate; phyllite; tuff; lava flow; volcanic rock (aphanitic)
Big Branch Gneiss (preCambrian-Proterozoic) at surface, covers < 0.1 % of this area
Big Branch Gneiss
Lithology: gneiss; schist
Coal Creek Serpentinite (preCambrian-Proterozoic) at surface, covers < 0.1 % of this area
Coal Creek Serpentinite
Lithology: serpentinite
Granite (preCambrian-Proterozoic [Grenville]) at surface, covers < 0.1 % of this area
Granite
Lithology: granite
Hazel Formation (preCambrian-Proterozoic [Grenville]) at surface, covers < 0.1 % of this area
Hazel Formation
Lithology: sandstone; conglomerate; arkose; limestone
Carrizo Mountain Group showing metaigneous rocks (preCambrian-Proterozoic) at surface, covers < 0.1 % of this area
Carrizo Mountain Group showing metaigneous rocks
Lithology: granodiorite; amphibolite; metarhyolite; pegmatite
Lost Creek Gneiss (preCambrian-Proterozoic) at surface, covers < 0.1 % of this area
Lost Creek Gneiss
Lithology: paragneiss; schist; metasedimentary rock
Llanoria Quartzite (preCambrian-Proterozoic [Grenville]) at surface, covers < 0.1 % of this area
Llanoria Quartzite
Lithology: quartzite; sandstone; siltstone; shale
Mafic igneous rocks (preCambrian-Proterozoic) at surface, covers < 0.1 % of this area
Mafic igneous rocks
Lithology: diorite; hornblendite; metagabbro
Mundy Breccia and Castner Limestone, undivided (preCambrian-Proterozoic) at surface, covers < 0.1 % of this area
Mundy Breccia and Castner Limestone, undivided
Lithology: limestone; basalt; hornfels; conglomerate; dolostone (dolomite); diabase
Packsaddle Schist (preCambrian-Proterozoic [Llano]) at surface, covers < 0.1 % of this area
Packsaddle Schist
Lithology: amphibole schist; quartz-feldspar schist; mica schist; schist; amphibolite; quartzite; marble; granulite; gneiss
Red Mountain Gneiss (preCambrian-Proterozoic) at surface, covers < 0.1 % of this area
Red Mountain Gneiss
Lithology: gneiss; granite; granite
Rhyolite (preCambrian-Proterozoic [Grenville]) at surface, covers < 0.1 % of this area
Rhyolite
Lithology: rhyolite; porphyry
Carrizo Mountain Group showing metasedimentary rocks (preCambrian-Proterozoic) at surface, covers < 0.1 % of this area
Carrizo Mountain Group showing metasedimentary rocks
Lithology: phyllite; mica schist; chert; slate; limestone; quartzite; amphibolite
Town Mountain Granite (preCambrian-Proterozoic) at surface, covers 0.1 % of this area
Town Mountain Granite
Lithology: granite; porphyry
Valley Spring Gneiss (preCambrian-Proterozoic) at surface, covers < 0.1 % of this area
Valley Spring Gneiss
Lithology: paragneiss; mica schist; amphibole schist
Van Horn Sandstone (preCambrian-Proterozoic [Grenville]) at surface, covers < 0.1 % of this area
Van Horn Sandstone
Lithology: sandstone; arkose; conglomerate
Younger granitic intrusion (preCambrian-Proterozoic) at surface, covers < 0.1 % of this area
Younger granitic intrusion
Lithology: granite; aplite; pegmatite
Carlsbad Group (Phanerozoic | Paleozoic | Permian [Guadalupe]) at surface, covers < 0.1 % of this area
Carlsbad Group
Lithology: limestone; sandstone
Cherry Canyon Formation (Phanerozoic | Paleozoic | Permian [Guadalupe]) at surface, covers 0.1 % of this area
Cherry Canyon Formation
Lithology: sandstone; siltstone; limestone; dolostone (dolomite)
Clear Fork Group (Phanerozoic | Paleozoic | Permian [Leonard]) at surface, covers 0.7 % of this area
Clear Fork Group
Lithology: mudstone; sandstone; dolostone (dolomite); siltstone; evaporite
Cibolo Formation (Phanerozoic | Paleozoic | Permian [Leonard]) at surface, covers < 0.1 % of this area
Cibolo Formation
Lithology: limestone; shale
Coleman Junction Formation (Phanerozoic | Paleozoic | Permian [Wolfcamp]) at surface, covers < 0.1 % of this area
Coleman Junction Formation
Lithology: mudstone; limestone; sandstone
Cloud Chief Formation (Phanerozoic | Paleozoic | Permian [Guadalupe]) at surface, covers < 0.1 % of this area
Cloud Chief Formation
Lithology: evaporite; shale; sandstone
Cathederal Mountain Formation (Phanerozoic | Paleozoic | Permian [Leonard]) at surface, covers < 0.1 % of this area
Cathederal Mountain Formation
Lithology: shale; chert; limestone; conglomerate
Cutoff Formation (Phanerozoic | Paleozoic | Permian [Leonard]) at surface, covers < 0.1 % of this area
Cutoff Formation
Lithology: shale; siltstone; sandstone; limestone
Dewey Lake Red beds (Phanerozoic | Paleozoic | Permian [Ochoa]) at surface, covers < 0.1 % of this area
Dewey Lake Red beds
Lithology: fine-grained mixed clastic; evaporite
Elm Creek Formation (Phanerozoic | Paleozoic | Permian [Leonard]) at surface, covers < 0.1 % of this area
Elm Creek Formation
Lithology: shale; mudstone; limestone
Grape Creek Formation (Phanerozoic | Paleozoic | Permian [Leonard]) at surface, covers 0.1 % of this area
Grape Creek Formation
Lithology: shale; limestone
Goat Seep Formation (Phanerozoic | Paleozoic | Permian [Guadalupe]) at surface, covers < 0.1 % of this area
Goat Seep Formation
Lithology: limestone ; sandstone
Hueco Limestone (Phanerozoic | Paleozoic | Permian [Wolfcamp]) at surface, covers 0.2 % of this area
Hueco Limestone
Lithology: limestone; dolostone (dolomite); sandstone; shale; mudstone; conglomerate
Jagger Bend and Valera Formations, undivided (Phanerozoic | Paleozoic | Permian [Leonard]) at surface, covers < 0.1 % of this area
Jagger Bend and Valera Formations, undivided
Lithology: shale; mudstone; limestone
Lenox Hills and Neal Ranch Formations, undivided (Phanerozoic | Paleozoic | Permian [Wolfcamp]) at surface, covers < 0.1 % of this area
Lenox Hills and Neal Ranch Formations, undivided
Lithology: shale; limestone; conglomerate
Lueders Formation (Phanerozoic | Paleozoic | Permian [Leonard]) at surface, covers 0.1 % of this area
Lueders Formation
Lithology: shale; limestone
Munn Formation (Phanerozoic | Paleozoic | Permian [Guadalupe]) at surface, covers < 0.1 % of this area
Munn Formation
Lithology: dolostone (dolomite); limestone; siltstone; sandstone
Mina Grande Formation (Phanerozoic | Paleozoic | Permian [Guadalupe]) at surface, covers < 0.1 % of this area
Mina Grande Formation
Lithology: limestone
Moran Formation (Phanerozoic | Paleozoic | Permian [Wolfcamp]) at surface, covers < 0.1 % of this area
Moran Formation
Lithology: mudstone; sandstone; limestone
Nocona Formation (Phanerozoic | Paleozoic | Permian [Wolfcamp Leonard]) at surface, covers 0.2 % of this area
Nocona Formation
Lithology: mudstone; sandstone; conglomerate
Black Peaks Member of Tornillo Formation (Phanerozoic | Cenozoic | Tertiary | Paleocene) at surface, covers < 0.1 % of this area
Black Peaks Member of Tornillo Formation
Lithology: sandstone; clay or mud
Hooper Formation (Phanerozoic | Cenozoic | Tertiary | Paleocene) at surface, covers 0.1 % of this area
Hooper Formation
Lithology: mudstone; sandstone
Kincaid Formation (Phanerozoic | Cenozoic | Tertiary | Paleocene) at surface, covers 0.1 % of this area
Kincaid Formation
Lithology: sand; clay or mud; limestone
Javelina Member of Tornillo Formation (Phanerozoic | Mesozoic Cenozoic | Cretaceous-Late Tertiary | Paleocene) at surface, covers < 0.1 % of this area
Javelina Member of Tornillo Formation
Lithology: clay or mud; sandstone
Midway Group, undivided (Phanerozoic | Cenozoic | Tertiary | Paleocene) at surface, covers 0.3 % of this area
Midway Group, undivided
Lithology: fine-grained mixed clastic; limestone; mudstone
Simsboro Formation (Phanerozoic | Cenozoic | Tertiary | Paleocene) at surface, covers 0.1 % of this area
Simsboro Formation
Lithology: sand; mudstone
Wills Point Formation (Phanerozoic | Cenozoic | Tertiary | Paleocene) at surface, covers 0.3 % of this area
Wills Point Formation
Lithology: clay or mud; limestone
Blanco Formation (Phanerozoic | Cenozoic | Tertiary | Pliocene) at surface, covers < 0.1 % of this area
Blanco Formation
Lithology: sand; clay or mud; limestone; gravel
bolson deposits (Phanerozoic | Cenozoic | Tertiary | Pliocene) at surface, covers < 0.1 % of this area
bolson deposits
Lithology: clay or mud; silt; sandstone; conglomerate
Fingers Formation (Phanerozoic | Cenozoic | Tertiary | Pliocene) at surface, covers < 0.1 % of this area
Fingers Formation
Lithology: indeterminate
Ogallala Formation (Phanerozoic | Cenozoic | Tertiary | Pliocene Miocene) at surface, covers 0.9 % of this area
Ogallala Formation
Lithology: sand; silt; clay or mud; gravel; carbonate
Rita Blanca Formation (Phanerozoic | Cenozoic | Tertiary | Pliocene) at surface, covers < 0.1 % of this area
Rita Blanca Formation
Lithology: sand; clay or mud; sandstone
unnamed Pliocene deposits (Phanerozoic | Cenozoic | Tertiary | Pliocene) at surface, covers < 0.1 % of this area
unnamed Pliocene deposits
Lithology: sand; gravel; silt
Willis Formation (Phanerozoic | Cenozoic | Tertiary | Pliocene) at surface, covers 0.8 % of this area
Willis Formation
Lithology: clay or mud; silt; sand; gravel
Petrolia Formation (Phanerozoic | Paleozoic | Permian [Wolfcamp Leonard]) at surface, covers 0.2 % of this area
Petrolia Formation
Lithology: mudstone ; sandstone; limestone
Harpersville Formation (Phanerozoic | Paleozoic | Carboniferous Pennsylvanian [Virgil]) at surface, covers 0.1 % of this area
Harpersville Formation
Lithology: mudstone; sandstone; siltstone; limestone
Magdalena Formation (Phanerozoic | Paleozoic | Carboniferous Pennsylvanian Permian (?)) at surface, covers < 0.1 % of this area
Magdalena Formation
Lithology: limestone; shale
Markley Formation (Phanerozoic | Paleozoic | Carboniferous Pennsylvanian Permian) at surface, covers 0.2 % of this area
Markley Formation
Lithology: sandstone; mudstone; conglomerate; coal; limestone
Pinto Canyon Formation (Phanerozoic | Paleozoic | Permian [Leonard Guadalupe]) at surface, covers < 0.1 % of this area
Pinto Canyon Formation
Lithology: limestone; siltstone; chert
Pueblo Formation (Phanerozoic | Paleozoic | Permian [Wolfcamp]) at surface, covers < 0.1 % of this area
Pueblo Formation
Lithology: mudstone; sandstone
Quartermaster Formation (Phanerozoic | Paleozoic | Permian [Guadalupe]) at surface, covers < 0.1 % of this area
Quartermaster Formation
Lithology: shale; sandstone; evaporite; dolostone (dolomite)
Quartermaster Formation and Whitehorse Group, undivided (Phanerozoic | Paleozoic | Permian [Guadalupe]) at surface, covers 0.2 % of this area
Quartermaster Formation and Whitehorse Group, undivided
Lithology: mixed clastic/carbonate; evaporite
Ross Mine Formation (Phanerozoic | Paleozoic | Permian [Guadalupe]) at surface, covers < 0.1 % of this area
Ross Mine Formation
Lithology: fine-grained mixed clastic
gypsum of Rustler, Salado, and Castile Formations, undivided (Phanerozoic | Paleozoic | Permian [Ochoa]) at surface, covers < 0.1 % of this area
gypsum of Rustler, Salado, and Castile Formations, undivided
Lithology: evaporite
Rustler Formation (Phanerozoic | Paleozoic | Permian [Ochoa]) at surface, covers 0.1 % of this area
Rustler Formation
Lithology: limestone; siltstone; sandstone
San Angelo Formation (Phanerozoic | Paleozoic | Permian [Guadalupe]) at surface, covers < 0.1 % of this area
San Angelo Formation
Lithology: mudstone; siltstone; evaporite
Santa Anna Branch Shale (Phanerozoic | Paleozoic | Permian [Wolfcamp]) at surface, covers < 0.1 % of this area
Santa Anna Branch Shale
Lithology: mudstone; shale; sandstone; limestone
Salado and Castile Formations, undivided (Phanerozoic | Paleozoic | Permian [Ochoa]) at surface, covers 0.2 % of this area
Salado and Castile Formations, undivided
Lithology: evaporite; evaporite; limestone
Sedwick Formation (Phanerozoic | Paleozoic | Permian [Wolfcamp]) at surface, covers < 0.1 % of this area
Sedwick Formation
Lithology: mudstone; sandstone; limestone
Skinner Ranch and Hess Formations, undivided (Phanerozoic | Paleozoic | Permian [Wolfcamp]) at surface, covers < 0.1 % of this area
Skinner Ranch and Hess Formations, undivided
Lithology: limestone; dolostone (dolomite); shale; conglomerate
Sedwick and Moran Formations, undivided (Phanerozoic | Paleozoic | Permian [Wolfcamp]) at surface, covers < 0.1 % of this area
Sedwick and Moran Formations, undivided
Lithology: mudstone; sandstone; limestone
Seven Rivers Formation (Phanerozoic | Paleozoic | Permian [Guadalupe]) at surface, covers < 0.1 % of this area
Seven Rivers Formation
Lithology: dolostone (dolomite); limestone
Santa Anna Branch Shale and Sedwick and Moran Formations, undivided (Phanerozoic | Paleozoic | Permian [Wolfcamp]) at surface, covers < 0.1 % of this area
Santa Anna Branch Shale and Sedwick and Moran Formations, undivided
Lithology: mudstone; shale; sandstone; limestone
Tansill Formation (Phanerozoic | Paleozoic | Permian [Guadalupe]) at surface, covers < 0.1 % of this area
Tansill Formation
Lithology: dolostone (dolomite); limestone
Talpa Formation (Phanerozoic | Paleozoic | Permian [Leonard]) at surface, covers 0.1 % of this area
Talpa Formation
Lithology: shale; limestone
Tessey Limestone (Phanerozoic | Paleozoic | Permian [Ochoa]) at surface, covers < 0.1 % of this area
Tessey Limestone
Lithology: limestone; dolostone (dolomite)
Victorio Peak Formation (Phanerozoic | Paleozoic | Permian [Leonard]) at surface, covers 0.1 % of this area
Victorio Peak Formation
Lithology: limestone; dolostone (dolomite); fine-grained mixed clastic
Word Formation (Phanerozoic | Paleozoic | Permian [Guadalupe]) at surface, covers < 0.1 % of this area
Word Formation
Lithology: limestone; sandstone; shale; dolostone (dolomite)
Whitehorse Group and Blaine Formation, undivided (Phanerozoic | Paleozoic | Permian [Guadalupe]) at surface, covers < 0.1 % of this area
Whitehorse Group and Blaine Formation, undivided
Lithology: sandstone; shale; evaporite; conglomerate
Whitehorse Group, undivided (Phanerozoic | Paleozoic | Permian [Guadalupe]) at surface, covers 0.3 % of this area
Whitehorse Group, undivided
Lithology: sandstone; shale; evaporite
Wilke Ranch Formation (Phanerozoic | Paleozoic | Permian [Leonard]) at surface, covers < 0.1 % of this area
Wilke Ranch Formation
Lithology: mudstone; limestone; conglomerate; chert
Waggoner Ranch Formation (Phanerozoic | Paleozoic | Permian [Leonard]) at surface, covers 0.1 % of this area
Waggoner Ranch Formation
Lithology: shale; mudstone; limestone; siltstone; sandstone; conglomerate
Yates Formation (Phanerozoic | Paleozoic | Permian [Guadalupe]) at surface, covers < 0.1 % of this area
Yates Formation
Lithology: siltstone; shale; limestone; dolostone (dolomite)
Paleozoic rocks, undivided (Phanerozoic | Paleozoic) at surface, covers < 0.1 % of this area
Paleozoic rocks, undivided
Lithology: limestone; shale; mixed clastic/carbonate
Alluvium in Rio Grande, subdivided into areas predominantly of clay (Phanerozoic | Cenozoic | Quaternary | Holocene) at surface, covers < 0.1 % of this area
Alluvium in Rio Grande, subdivided into areas predominantly of clay
Lithology: silt; clay or mud
alkali flat deposits (Phanerozoic | Cenozoic | Quaternary | Holocene) at surface, covers < 0.1 % of this area
alkali flat deposits
Lithology: playa; evaporite; clay or mud; sand; dolostone (dolomite)
alluvium (Phanerozoic | Cenozoic | Quaternary | Holocene) at surface, covers 4 % of this area
alluvium
Lithology: sand; silt; clay or mud; gravel
older alluvial deposits (Phanerozoic | Cenozoic | Quaternary | Pleistocene) at surface, covers 0.9 % of this area
older alluvial deposits
Lithology: gravel; sand; silt
Alluvium in Rio Grande, subdivided into areas predominantly of sand (Phanerozoic | Cenozoic | Quaternary | Holocene) at surface, covers < 0.1 % of this area
Alluvium in Rio Grande, subdivided into areas predominantly of sand
Lithology: sand; silt
bolson deposits (Phanerozoic | Cenozoic | Quaternary | Pleistocene Holocene) at surface, covers 0.2 % of this area
bolson deposits
Lithology: clay or mud; silt; sand; evaporite
barrier island deposits (Phanerozoic | Cenozoic | Quaternary) at surface, covers 0.1 % of this area
barrier island deposits
Lithology: sand; silt
Beaumont Formation, areas predominantly clay (Phanerozoic | Cenozoic | Quaternary | Pleistocene-Late) at surface, covers 1 % of this area
Beaumont Formation, areas predominantly clay
Lithology: clay or mud; silt
Blackwater Draw Formation (Phanerozoic | Cenozoic | Quaternary | Pleistocene) at surface, covers 3 % of this area
Blackwater Draw Formation
Lithology: sand; silt; clay or mud
barrier ridge and barrier flat deposts (Phanerozoic | Cenozoic | Quaternary | Holocene) at surface, covers < 0.1 % of this area
barrier ridge and barrier flat deposts
Lithology: sand; silt; clay or mud
Beaumont Formation, areas predominantly sand (Phanerozoic | Cenozoic | Quaternary | Pleistocene-Late) at surface, covers 0.9 % of this area
Beaumont Formation, areas predominantly sand
Lithology: sand; silt; clay or mud; gravel
in Rio Grande delta area, clay veneer over meanderbelt sand (Phanerozoic | Cenozoic | Quaternary) at surface, covers < 0.1 % of this area
in Rio Grande delta area, clay veneer over meanderbelt sand
Lithology: clay or mud; sand
caliche deposits (Phanerozoic | Cenozoic | Quaternary | Pleistocene Holocene) at surface, covers 0.2 % of this area
caliche deposits
Lithology: evaporite
clay dune (Phanerozoic | Cenozoic | Quaternary | Holocene) at surface, covers < 0.1 % of this area
clay dune
Lithology: sand; silt; clay or mud
Deweyville Formation (Phanerozoic | Cenozoic | Quaternary | Pleistocene Holocene (?)) at surface, covers 0.2 % of this area
Deweyville Formation
Lithology: sand; silt; clay or mud
Deweyville Formation with higher level? (Phanerozoic | Cenozoic | Quaternary | Pleistocene Holocene (?)) at surface, covers < 0.1 % of this area
Deweyville Formation with higher level?
Lithology: clay or mud; silt
Double Lakes Formation (Phanerozoic | Cenozoic | Quaternary | Pleistocene [Early Wisconsinan]) at surface, covers < 0.1 % of this area
Double Lakes Formation
Lithology: sand; gravel
dune sand sheet deposits (Phanerozoic | Cenozoic | Quaternary | Holocene) at surface, covers 0.6 % of this area
dune sand sheet deposits
Lithology: sand; silt
alluvial fan deposits (Phanerozoic | Cenozoic | Quaternary | Pleistocene Holocene) at surface, covers 0.8 % of this area
alluvial fan deposits
Lithology: alluvial fan
Gatuna Formation (Phanerozoic | Cenozoic | Quaternary | Pleistocene-Middle(?)) at surface, covers < 0.1 % of this area
Gatuna Formation
Lithology: sand; conglomerate; evaporite; limestone; siltstone; shale
gypsite deposits (Phanerozoic | Cenozoic | Quaternary | Pleistocene Holocene) at surface, covers < 0.1 % of this area
gypsite deposits
Lithology: evaporite
high gravel deposits (Phanerozoic | Cenozoic | Quaternary | Pleistocene) at surface, covers 0.2 % of this area
high gravel deposits
Lithology: gravel; silt; sand
Lissie Formation (Phanerozoic | Cenozoic | Quaternary | Pleistocene-Middle) at surface, covers 1 % of this area
Lissie Formation
Lithology: sand; silt; clay or mud
Leona Formation (Phanerozoic | Cenozoic | Quaternary | Pleistocene) at surface, covers 0.5 % of this area
Leona Formation
Lithology: sand; gravel; clay or mud
Lingos Formation (Phanerozoic | Cenozoic | Quaternary | Pleistocene-Middle(?) Pleistocene-Late(?) Holocene) at surface, covers 0.4 % of this area
Lingos Formation
Lithology: sand; gravel; clay or mud; silt
land slide deposits (Phanerozoic | Cenozoic | Quaternary | Pleistocene Holocene) at surface, covers < 0.1 % of this area
land slide deposits
Lithology: landslide
Onion Creek Marl (Phanerozoic | Cenozoic | Quaternary | Pleistocene) at surface, covers < 0.1 % of this area
Onion Creek Marl
Lithology: sand; gravel; clay or mud
playa deposits (Phanerozoic | Cenozoic | Quaternary | Pleistocene Holocene) at surface, covers 0.1 % of this area
playa deposits
Lithology: clay or mud; silt
sand sheet deposits (Phanerozoic | Cenozoic | Quaternary | Holocene) at surface, covers 3 % of this area
sand sheet deposits
Lithology: sand; silt
sand dune deposits (Phanerozoic | Cenozoic | Quaternary | Holocene) at surface, covers < 0.1 % of this area
sand dune deposits
Lithology: sand; silt
Seymour Formation (Phanerozoic | Cenozoic | Quaternary | Pleistocene-Middle [Irvingtonian]) at surface, covers 0.2 % of this area
Seymour Formation
Lithology: sand; gravel; clay or mud
silt sheet (Phanerozoic | Cenozoic | Quaternary | Holocene) at surface, covers 0.2 % of this area
silt sheet
Lithology: silt; sand
sand deposits, undivided (Phanerozoic | Cenozoic | Quaternary | Holocene) at surface, covers 0.3 % of this area
sand deposits, undivided
Lithology: sand; silt
Terrace deposits (Phanerozoic | Cenozoic | Quaternary | Pleistocene Holocene) at surface, covers 2 % of this area
Terrace deposits
Lithology: terrace; sand; gravel; silt; clay or mud
Quaternary-Tertiary deposits, undivided (Phanerozoic | Cenozoic | Tertiary Quaternary | Pliocene Pleistocene) at surface, covers < 0.1 % of this area
Quaternary-Tertiary deposits, undivided
Lithology: gravel; conglomerate
Tahoka Formation (Phanerozoic | Cenozoic | Quaternary | Pleistocene [Wisconsinan]) at surface, covers 0.1 % of this area
Tahoka Formation
Lithology: clay or mud; silt; sand; gravel
Quaternary-Tertiary bolson deposits (Phanerozoic | Cenozoic | Tertiary Quaternary | Pliocene Pleistocene) at surface, covers 0.2 % of this area
Quaternary-Tertiary bolson deposits
Lithology: clay or mud; silt; sandstone; conglomerate
Toy Limestone (Phanerozoic | Cenozoic | Quaternary | Pleistocene-Early(?)) at surface, covers < 0.1 % of this area
Toy Limestone
Lithology: limestone
Tule Formation (Phanerozoic | Cenozoic | Quaternary | Pleistocene) at surface, covers < 0.1 % of this area
Tule Formation
Lithology: sand; silt; clay or mud
Uvalde Gravel (Phanerozoic | Cenozoic | Tertiary Quaternary | Pliocene Pleistocene) at surface, covers 0.4 % of this area
Uvalde Gravel
Lithology: gravel; chert
Quaternary deposit, undivided (Phanerozoic | Cenozoic | Quaternary) at surface, covers 2 % of this area
sand, silt, clay, and gravel. locally indurated with calcium carbonate (caliche); includes point bar, natural levee, stream channel, sand dune, terrace, alluvial fan, landslide bolson and playa deposits
Lithology: sand ; silt ; clay or mud; gravel; carbonate
pond deposits (Phanerozoic | Cenozoic | Quaternary | Pleistocene) at surface, covers < 0.1 % of this area
pond deposits
Lithology: silt; sand
Fusselman Dolomite (Phanerozoic | Paleozoic | Silurian) at surface, covers < 0.1 % of this area
Fusselman Dolomite
Lithology: dolostone (dolomite); limestone
Tertiary intrusive rocks, undivided (Phanerozoic | Cenozoic | Tertiary) at surface, covers < 0.1 % of this area
Tertiary intrusive rocks, undivided
Lithology: granite; granite
Chinle Formation (Phanerozoic | Mesozoic | Triassic-Late) at surface, covers < 0.1 % of this area
Chinle Formation
Lithology: fine-grained mixed clastic; sandstone
Dockum Group, undivided (Phanerozoic | Mesozoic | Triassic-Late) at surface, covers < 0.1 % of this area
Dockum Group
Lithology: fine-grained mixed clastic; limestone; conglomerate
Trujillo Formation (Phanerozoic | Mesozoic | Triassic-Late) at surface, covers 0.1 % of this area
Trujillo Formation
Lithology: fine-grained mixed clastic; sandstone
Tecovas Formation (Phanerozoic | Mesozoic | Triassic-Late) at surface, covers 0.1 % of this area
Tecovas Formation
Lithology: fine-grained mixed clastic; sandstone

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