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

Geologic units in Jeff Davis county, Texas

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

Duff Formation, Decie Member from Paisano caldera (Phanerozoic | Cenozoic | Tertiary | Oligocene-Early) at surface, covers 0.6 % of this area

Duff Formation, Decie Member from Paisano caldera

Lithology: rhyolite; trachyte; tuff; conglomerate

Loma Plata Formation (Phanerozoic | Mesozoic | Cretaceous-Early [Comanchean]) at surface, covers < 0.1 % of this area

Loma Plata 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 0.2 % of this area

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

Lithology: rhyolite; basalt; tuff; sandstone; conglomerate; limestone

Finlay Limestone (Phanerozoic | Mesozoic | Cretaceous-Early [Comanchean Albian]) at surface, covers 0.1 % of this area

Finlay Limestone

Lithology: limestone; siltstone; sandstone

alluvium (Phanerozoic | Cenozoic | Quaternary | Holocene) at surface, covers 24 % of this area

alluvium

Lithology: sand; silt; clay or mud; gravel

Quaternary-Tertiary bolson deposits (Phanerozoic | Cenozoic | Tertiary Quaternary | Pliocene Pleistocene) at surface, covers 0.5 % of this area

Quaternary-Tertiary bolson deposits

Lithology: clay or mud; silt; sandstone; conglomerate

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

Vieja Group, including Bracks Rhyolite, Chambers and Colmena Tuffs and Gill Breccia (Phanerozoic | Cenozoic | Tertiary | Eocene Oligocene) at surface, covers 1 % of this area

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

Lithology: rhyolite; sandstone; ash-flow tuff; breccia; conglomerate

Washita Group (Phanerozoic | Mesozoic | Cretaceous-Early [Comanchean] Cretaceous-Late ) at surface, covers < 0.1 % of this area

Washita Group

Lithology: clay or mud; limestone

Cox Sandstone (Phanerozoic | Mesozoic | Cretaceous-Early) at surface, covers 0.2 % of this area

Cox Sandstone

Lithology: mixed clastic/carbonate; limestone

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

Jones Basalt

Lithology: basalt; trachyandesite

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

San Carlos Sandstone

Lithology: sandstone; coal

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 12 % 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

Wiley Mountain caldera volcanic rocks (Phanerozoic | Cenozoic | Tertiary | Eocene) at surface, covers 2 % of this area

Wiley Mountain caldera volcanic rocks

Lithology: trachyte; volcanic breccia (agglomerate); felsic volcanic rock; tuff

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 33 % 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

Bouquillas Formation (Phanerozoic | Mesozoic | Cretaceous-Late) at surface, covers 0.5 % of this area

Bouquillas Formation

Lithology: limestone; shale; mudstone; siltstone

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

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

older alluvial deposits (Phanerozoic | Cenozoic | Quaternary | Pleistocene) at surface, covers 3 % of this area

older alluvial deposits

Lithology: gravel; sand; silt

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

Ojinaga Formation

Lithology: shale; sandstone; limestone

Eocene intrusive rocks (Phanerozoic | Cenozoic | Tertiary | Eocene) at surface, covers 0.3 % of this area

Eocene intrusive rocks

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

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

Oligocene intrusive rocks

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

land slide deposits (Phanerozoic | Cenozoic | Quaternary | Pleistocene Holocene) at surface, covers 4 % of this area

land slide deposits

Lithology: landslide

Tarantula Gravel (Phanerozoic | Cenozoic | Tertiary | Miocene) at surface, covers 0.7 % of this area

Tarantula Gravel

Lithology: gravel; tuff; trachyte; basalt; ignimbrite; quartzite; limestone

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

Boracho Limestone

Lithology: limestone

alluvial fan deposits (Phanerozoic | Cenozoic | Quaternary | Pleistocene Holocene) at surface, covers 7 % of this area

alluvial fan deposits

Lithology: alluvial fan

Seven Rivers Formation (Phanerozoic | Paleozoic | Permian [Guadalupe]) at surface, covers < 0.1 % of this area

Seven Rivers Formation

Lithology: dolostone (dolomite); limestone

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

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

Bluff Mesa Formation

Lithology: limestone; sandstone; shale

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

Tertiary intrusive rocks, undivided (Phanerozoic | Cenozoic | Tertiary) at surface, covers 0.4 % of this area

Tertiary intrusive rocks, undivided

Lithology: granite; granite

Quaternary-Tertiary deposits, undivided (Phanerozoic | Cenozoic | Tertiary Quaternary | Pliocene Pleistocene) at surface, covers 1 % of this area

Quaternary-Tertiary deposits, undivided

Lithology: gravel; conglomerate

Buda Limestone (Phanerozoic | Mesozoic | Cretaceous-Early) at surface, covers 0.9 % of this area

Buda Limestone

Lithology: limestone

Eagle Mountains caldera volcanic rocks (Phanerozoic | Cenozoic | Tertiary | Oligocene) at surface, covers 0.2 % of this area

Eagle Mountains caldera volcanic rocks

Lithology: rhyolite; trachyte; conglomerate; tuff; volcanic breccia (agglomerate)

Gulfian rocks, undivided (Phanerozoic | Mesozoic | Cretaceous-Late) at surface, covers 0.4 % of this area

Gulfian rocks, undivided

Lithology: mudstone; shale; limestone

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