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

Geologic units in Pecos county, Texas

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

Washita and Fredericksburg Groups, undivided (Phanerozoic | Mesozoic | Cretaceous-Early [Comanchean]) at surface, covers 0.2 % of this area

Washita and Fredericksburg Groups, undivided

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

Tessey Limestone (Phanerozoic | Paleozoic | Permian [Ochoa]) at surface, covers 0.6 % of this area

Tessey Limestone

Lithology: limestone; dolostone (dolomite)

Dimple Formation (Phanerozoic | Paleozoic | Carboniferous Pennsylvanian-Early) at surface, covers 0.1 % of this area

Dimple Formation

Lithology: limestone; shale

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

alluvium (Phanerozoic | Cenozoic | Quaternary | Holocene) at surface, covers 26 % of this area

alluvium

Lithology: sand; silt; clay or mud; gravel

Fredericksberg Group and Maxon Sandstone, undivided (Phanerozoic | Mesozoic | Cretaceous-Early [Comanchean]) at surface, covers 1 % 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 9 % of this area

Washita Group

Lithology: clay or mud; limestone

Skinner Ranch and Hess Formations, undivided (Phanerozoic | Paleozoic | Permian [Wolfcamp]) at surface, covers 0.6 % of this area

Skinner Ranch and Hess Formations, undivided

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

Word Formation (Phanerozoic | Paleozoic | Permian [Guadalupe]) at surface, covers 0.2 % of this area

Word Formation

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

Antlers Sand (Phanerozoic | Mesozoic | Cretaceous-Early) at surface, covers < 0.1 % of this area

Antlers Sand

Lithology: sand; clay or mud; conglomerate; sandstone; claystone

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

Bouquillas Formation (Phanerozoic | Mesozoic | Cretaceous-Late) at surface, covers < 0.1 % of this area

Bouquillas Formation

Lithology: limestone; shale; mudstone; siltstone

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

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

Bissett Conglomerate

Lithology: conglomerate; limestone; shale

Capitan Formation (Phanerozoic | Paleozoic | Permian [Guadalupe]) at surface, covers 0.7 % of this area

Capitan Formation

Lithology: limestone; dolostone (dolomite)

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

gypsite deposits

Lithology: evaporite

older alluvial deposits (Phanerozoic | Cenozoic | Quaternary | Pleistocene) at surface, covers 4 % of this area

older alluvial deposits

Lithology: gravel; sand; silt

Maxon Sandstone and Glen Rose Limestone, undivided (Phanerozoic | Mesozoic | Cretaceous-Early) at surface, covers 0.2 % of this area

Maxon Sandstone and Glen Rose Limestone, undivided

Lithology: sandstone; limestone

Cathederal Mountain Formation (Phanerozoic | Paleozoic | Permian [Leonard]) at surface, covers < 0.1 % of this area

Cathederal Mountain Formation

Lithology: shale; chert; limestone; conglomerate

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

land slide deposits (Phanerozoic | Cenozoic | Quaternary | Pleistocene Holocene) at surface, covers 0.3 % of this area

land slide deposits

Lithology: landslide

Fredericksburg Group (Phanerozoic | Mesozoic | Cretaceous-Early [Comanchean]) at surface, covers 6 % of this area

Fredericksburg Group

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

Gatuna Formation (Phanerozoic | Cenozoic | Quaternary | Pleistocene-Middle(?)) at surface, covers < 0.1 % of this area

Gatuna Formation

Lithology: sand; conglomerate; evaporite; limestone; siltstone; shale

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

pond deposits

Lithology: silt; sand

Terrace deposits (Phanerozoic | Cenozoic | Quaternary | Pleistocene Holocene) at surface, covers 2 % of this area

Terrace deposits

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

Edwards Limestone (Phanerozoic | Mesozoic | Cretaceous-Early) at surface, covers 20 % of this area

Edwards Limestone

Lithology: limestone; dolostone (dolomite); chert

alluvial fan deposits (Phanerozoic | Cenozoic | Quaternary | Pleistocene Holocene) at surface, covers 5 % of this area

alluvial fan deposits

Lithology: alluvial fan

Santa Elena Limestone (Phanerozoic | Mesozoic | Cretaceous-Early) at surface, covers 0.4 % of this area

Santa Elena Limestone

Lithology: limestone; mudstone; chert

Quaternary deposit, undivided (Phanerozoic | Cenozoic | Quaternary) at surface, covers 19 % 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

Tahoka Formation (Phanerozoic | Cenozoic | Quaternary | Pleistocene [Wisconsinan]) at surface, covers < 0.1 % of this area

Tahoka Formation

Lithology: clay or mud; silt; sand; gravel

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 < 0.1 % of this area

sand sheet deposits

Lithology: sand; silt

Quaternary-Tertiary deposits, undivided (Phanerozoic | Cenozoic | Tertiary Quaternary | Pliocene Pleistocene) at surface, covers 3 % of this area

Quaternary-Tertiary deposits, undivided

Lithology: gravel; conglomerate

Buda Limestone (Phanerozoic | Mesozoic | Cretaceous-Early) at surface, covers 2 % of this area

Buda Limestone

Lithology: limestone

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

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

Gulfian rocks, undivided

Lithology: mudstone; shale; limestone