Geologic units in Brewster county, Texas

Additional scientific data in this geographic area

Alluvial fan deposits (Pleistocene and Holocene) at surface, covers 18 % of this area

Alluvial fan deposits

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

Santa Elena Limestone

Older alluvial deposits (Pleistocene) at surface, covers 10 % of this area

Older alluvial deposits

Bouquillas Formation (Late Cretaceous) at surface, covers 8 % of this area

Bouquillas Formation

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

Alluvium (Holocene) at surface, covers 5 % of this area

Alluvium

Tesnus Formation (Early Pennsylvanian and Late Mississippian) at surface, covers 4 % of this area

Tesnus Formation

Aguja Formation (Late Cretaceous) at surface, covers 3 % of this area

Aguja Formation

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

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

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

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

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

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

Maxon Sandstone and Glen Rose Limestone, undivided

Pen Formation (Late Cretaceous) at surface, covers 2 % of this area

Pen Formation

Capitan Formation (Permian; Guadalupe Series) at surface, covers 2 % of this area

Capitan Formation

Oligocene intrusive rocks (Oligocene) at surface, covers 2 % of this area

Oligocene intrusive rocks

Javelina Member of Tornillo Formation (Late Cretaceous and Paleocene) at surface, covers 1 % of this area

Javelina Member of Tornillo Formation

Devils Graveyard volcanic rocks (Eocene to Oligocene) at surface, covers 1 % of this area

Devils Graveyard volcanic rocks

Woods Hollow Shale, Fort Pena Formation, Alsate Shale, Marathon Limestone, and Dagger Flat Sandstone, undivided (Cambrian and Ordovician) at surface, covers 1 % of this area

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

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

Tertiary intrusive rocks, undivided

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

Duff Formation, Decie Member from Paisano caldera

Eocene intrusive rocks (Eocene) at surface, covers 1 % of this area

Eocene intrusive rocks

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

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

Bolson deposits (Pliocene) at surface, covers 0.8 % of this area

Bolson deposits

Quaternary deposit, undivided (Quaternary) at surface, covers 0.8 % of this area

Quaternary deposit, undivided

Washita and Fredericksburg Groups, undivided (Early Cretaceous; Comanchean Series) at surface, covers 0.8 % of this area

Washita and Fredericksburg Groups, undivided

Caballos Novaculite and Maravillas Chert, undivided (Late Ordovician; Mississippian; and Devonian) at surface, covers 0.8 % of this area

Caballos Novaculite and Maravillas Chert, undivided

Edwards Limestone (Early Cretaceous) at surface, covers 0.7 % of this area

Edwards Limestone

Washita Group (Early and Late Cretaceous; Comanchean Series) at surface, covers 0.7 % of this area

Washita Group

Fredericksburg Group (Early Cretaceous; Comanchean Series) at surface, covers 0.6 % of this area

Fredericksburg Group

Dimple Formation (Early Pennsylvanian) at surface, covers 0.6 % of this area

Dimple Formation

Haymond Formation (Early Pennsylvanian) at surface, covers 0.6 % of this area

Haymond Formation

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

Land slide deposits

Fredericksberg Group and Maxon Sandstone, undivided (Early Cretaceous; Comanchean Series) at surface, covers 0.5 % of this area

Fredericksberg Group and Maxon Sandstone, undivided

Word Formation (Permian; Guadalupe Series) at surface, covers 0.4 % of this area

Word Formation

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

Quaternary-Tertiary deposits, undivided

Skinner Ranch and Hess Formations, undivided (Permian; Wolfcamp Series) at surface, covers 0.4 % of this area

Skinner Ranch and Hess Formations, undivided

Barnett Formation, Chappel Limestone, Houy, Zesch, Bear Spring, and Stribling Formations, and Pillar Bluff Limestone, undivided (Late; Middle; and Early Mississippian and Devonian) at surface, covers 0.3 % of this area

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

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

South Rim Formation from Pine Canyon Caldera

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

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

Cathederal Mountain Formation

Glen Rose Limestone (Early Cretaceous) at surface, covers 0.3 % of this area

Glen Rose Limestone

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

Quaternary-Tertiary bolson deposits

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

Black Gap area volcanic rocks

Gaptank Formation (Early; Middle; and Late Pennsylvanian) at surface, covers 0.2 % of this area

Gaptank Formation

Older volcanic rocks of Davis and Barilla Mountains, including Sheep Pasture, Sleeping Lion, Frazier Canyon, Adobe Canyon, and Limpia formations, Gomez Tuff, Star Mountain Rhyolite, and Huelster Formation (Late Eocene) at surface, covers 0.2 % 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

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

Hannold Hill Member of Tornillo Formation

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

Tessey Limestone

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

Bissett Conglomerate

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

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

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

Fingers Formation

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

Eocene volcanic rocks

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

Black Peaks Member of Tornillo Formation

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

Lenox Hills and Neal Ranch Formations, undivided

Perdiz Conglomerate, Tascotal Formation, and tuffaceous sediments of Fresno Formation (Oligocene) at surface, covers < 0.1 % of this area

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

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

Jones Basalt

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

Ordovician rocks, undivided

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

Terrace deposits

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

Sue Peaks Formation

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

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

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

Gulfian rocks, undivided