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

Geologic units in Brewster county, Texas

[Additional scientific data in this geographic area]

Aguja Formation (Phanerozoic | Mesozoic | Cretaceous-Late) at surface, covers 3 % of this area

Aguja Formation

Lithology: clay or mud; sandstone; coal

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 0.3 % 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

Haymond Formation (Phanerozoic | Paleozoic | Carboniferous Pennsylvanian-Early) at surface, covers 0.6 % of this area

Haymond Formation

Lithology: medium-grained mixed clastic; fine-grained mixed clastic; conglomerate; arkose

Caballos Novaculite and Maravillas Chert, undivided (Phanerozoic | Paleozoic | Ordovician-Late Devonian Carboniferous Mississippian) at surface, covers 0.8 % of this area

Caballos Novaculite and Maravillas Chert, undivided

Lithology: chert; novaculite; limestone; shale

Washita and Fredericksburg Groups, undivided (Phanerozoic | Mesozoic | Cretaceous-Early [Comanchean]) at surface, covers 0.8 % of this area

Washita and Fredericksburg Groups, undivided

Lithology: clay or mud; limestone; dolostone (dolomite); chert

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

Dimple Formation (Phanerozoic | Paleozoic | Carboniferous Pennsylvanian-Early) at surface, covers 0.6 % of this area

Dimple Formation

Lithology: limestone; shale

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 6 % 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

Duff Formation, Decie Member from Paisano caldera (Phanerozoic | Cenozoic | Tertiary | Oligocene-Early) at surface, covers 1 % of this area

Duff Formation, Decie Member from Paisano caldera

Lithology: rhyolite; trachyte; tuff; conglomerate

Tessey Limestone (Phanerozoic | Paleozoic | Permian [Ochoa]) at surface, covers 0.1 % of this area

Tessey Limestone

Lithology: limestone; dolostone (dolomite)

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

Javelina Member of Tornillo Formation (Phanerozoic | Mesozoic Cenozoic | Cretaceous-Late Tertiary | Paleocene) at surface, covers 1 % of this area

Javelina Member of Tornillo Formation

Lithology: clay or mud; sandstone

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

Sue Peaks Formation

Lithology: limestone; shale; mudstone

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

alluvium (Phanerozoic | Cenozoic | Quaternary | Holocene) at surface, covers 5 % of this area

alluvium

Lithology: sand; silt; clay or mud; gravel

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

Fredericksberg Group and Maxon Sandstone, undivided (Phanerozoic | Mesozoic | Cretaceous-Early [Comanchean]) at surface, covers 0.5 % of this area

Fredericksberg Group and Maxon Sandstone, undivided

Lithology: sandstone; limestone; dolostone (dolomite)

Washita Group (Phanerozoic | Mesozoic | Cretaceous-Early [Comanchean] Cretaceous-Late ) at surface, covers 0.7 % of this area

Washita Group

Lithology: clay or mud; limestone

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 0.3 % 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

Jones Basalt (Phanerozoic | Cenozoic | Tertiary | Oligocene) at surface, covers < 0.1 % of this area

Jones Basalt

Lithology: basalt; trachyandesite

Devils Graveyard volcanic rocks (Phanerozoic | Cenozoic | Tertiary | Eocene Oligocene) at surface, covers 1 % of this area

Devils Graveyard volcanic rocks

Lithology: tuff; basalt

Word Formation (Phanerozoic | Paleozoic | Permian [Guadalupe]) at surface, covers 0.4 % of this area

Word Formation

Lithology: limestone; sandstone; shale; dolostone (dolomite)

Eocene volcanic rocks (Phanerozoic | Cenozoic | Tertiary | Eocene) at surface, covers < 0.1 % of this area

Eocene volcanic rocks

Lithology: rhyolite

Fingers Formation (Phanerozoic | Cenozoic | Tertiary | Pliocene) at surface, covers 0.1 % of this area

Fingers Formation

Lithology: indeterminate

Skinner Ranch and Hess Formations, undivided (Phanerozoic | Paleozoic | Permian [Wolfcamp]) at surface, covers 0.4 % of this area

Skinner Ranch and Hess Formations, undivided

Lithology: limestone; dolostone (dolomite); shale; conglomerate

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

Bouquillas Formation (Phanerozoic | Mesozoic | Cretaceous-Late) at surface, covers 8 % of this area

Bouquillas Formation

Lithology: limestone; shale; mudstone; siltstone

Santa Elena Limestone, Sue Peaks Formation, Del Carmen Limestone, and Telephone Canyon Formation, undivided (Phanerozoic | Mesozoic | Cretaceous-Early) at surface, covers 1 % of this area

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

Lithology: limestone; shale

Bissett Conglomerate (Phanerozoic | Mesozoic | Cretaceous-Early) at surface, covers 0.1 % of this area

Bissett Conglomerate

Lithology: conglomerate; limestone; shale

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 0.2 % 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

Buda Limestone and Del Rio Clay, undivided (Phanerozoic | Mesozoic | Cretaceous-Late) at surface, covers 2 % of this area

Buda Limestone and Del Rio Clay, undivided

Lithology: limestone; mudstone; clay or mud; siltstone; shale

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 3 % 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

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

Ordovician rocks, undivided

Lithology: limestone; shale

Capitan Formation (Phanerozoic | Paleozoic | Permian [Guadalupe]) at surface, covers 2 % of this area

Capitan Formation

Lithology: limestone; dolostone (dolomite)

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

Woods Hollow Shale, Fort Pena Formation, Alsate Shale, Marathon Limestone, and Dagger Flat Sandstone, undivided (Phanerozoic | Paleozoic| Cambrian Ordovician) at surface, covers 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

Cathederal Mountain Formation (Phanerozoic | Paleozoic | Permian [Leonard]) at surface, covers 0.3 % of this area

Cathederal Mountain Formation

Lithology: shale; chert; limestone; conglomerate

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

older alluvial deposits (Phanerozoic | Cenozoic | Quaternary | Pleistocene) at surface, covers 10 % of this area

older alluvial deposits

Lithology: gravel; sand; silt

Black Gap area volcanic rocks (Phanerozoic | Cenozoic | Tertiary | Miocene) at surface, covers 0.2 % of this area

Black Gap area volcanic rocks

Lithology: tuff; basalt

Maxon Sandstone and Glen Rose Limestone, undivided (Phanerozoic | Mesozoic | Cretaceous-Early) at surface, covers 2 % of this area

Maxon Sandstone and Glen Rose Limestone, undivided

Lithology: sandstone; limestone

Gaptank Formation (Phanerozoic | Paleozoic | Carboniferous Pennsylvanian-Early Pennsylvanian-Middle Pennsylvanian-Late) at surface, covers 0.2 % of this area

Gaptank Formation

Lithology: fine-grained mixed clastic; limestone; conglomerate

Oligocene intrusive rocks (Phanerozoic | Cenozoic | Tertiary | Oligocene) at surface, covers 2 % of this area

Oligocene intrusive rocks

Lithology: basalt; trachyte; felsic volcanic rock; rhyolite; phonolite; latite; trachyandesite

Eocene intrusive rocks (Phanerozoic | Cenozoic | Tertiary | Eocene) at surface, covers 1 % of this area

Eocene intrusive rocks

Lithology: basalt; trachyte; felsic volcanic rock; rhyolite; phonolite; latite; trachyandesite

land slide deposits (Phanerozoic | Cenozoic | Quaternary | Pleistocene Holocene) at surface, covers 0.5 % of this area

land slide deposits

Lithology: landslide

Fredericksburg Group (Phanerozoic | Mesozoic | Cretaceous-Early [Comanchean]) at surface, covers 0.6 % of this area

Fredericksburg Group

Lithology: limestone; mudstone; dolostone (dolomite); chert

Terrace deposits (Phanerozoic | Cenozoic | Quaternary | Pleistocene Holocene) at surface, covers < 0.1 % of this area

Terrace deposits

Lithology: terrace; sand; gravel; silt; clay or mud

Edwards Limestone (Phanerozoic | Mesozoic | Cretaceous-Early) at surface, covers 0.7 % of this area

Edwards Limestone

Lithology: limestone; dolostone (dolomite); chert

alluvial fan deposits (Phanerozoic | Cenozoic | Quaternary | Pleistocene Holocene) at surface, covers 18 % of this area

alluvial fan deposits

Lithology: alluvial fan

Pen Formation (Phanerozoic | Mesozoic | Cretaceous-Late) at surface, covers 2 % of this area

Pen Formation

Lithology: clay or mud; sandstone

Santa Elena Limestone (Phanerozoic | Mesozoic | Cretaceous-Early) at surface, covers 12 % of this area

Santa Elena Limestone

Lithology: limestone; mudstone; chert

Quaternary deposit, undivided (Phanerozoic | Cenozoic | Quaternary) at surface, covers 0.8 % 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

South Rim Formation from Pine Canyon Caldera (Phanerozoic | Cenozoic | Tertiary | Oligocene) at surface, covers 0.3 % of this area

South Rim Formation from Pine Canyon Caldera

Lithology: rhyolite; ash-flow tuff; lava flow; volcanic breccia (agglomerate); vitrophyre

Buda Limestone (Phanerozoic | Mesozoic | Cretaceous-Early) at surface, covers 0.1 % of this area

Buda Limestone

Lithology: limestone

Sue Peaks Formation, Del Carmen Limestone, and Telephone Canyon Formation, undivided (Phanerozoic | Mesozoic | Cretaceous-Early) at surface, covers 3 % of this area

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

Lithology: limestone; shale

Tesnus Formation (Phanerozoic | Paleozoic | Carboniferous Mississippian-Late Pennsylvanian-Early) at surface, covers 4 % of this area

Tesnus Formation

Lithology: medium-grained mixed clastic; fine-grained mixed clastic; chert; arkose; conglomerate

Quaternary-Tertiary deposits, undivided (Phanerozoic | Cenozoic | Tertiary Quaternary | Pliocene Pleistocene) at surface, covers 0.4 % of this area

Quaternary-Tertiary deposits, undivided

Lithology: gravel; conglomerate

bolson deposits (Phanerozoic | Cenozoic | Tertiary | Pliocene) at surface, covers 0.8 % of this area

bolson deposits

Lithology: clay or mud; silt; sandstone; conglomerate

Tertiary intrusive rocks, undivided (Phanerozoic | Cenozoic | Tertiary) at surface, covers 1 % of this area

Tertiary intrusive rocks, undivided

Lithology: granite; granite

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

Gulfian rocks, undivided

Lithology: mudstone; shale; limestone