Geologic units in Pecos county, Texas

Alluvium (Holocene) at surface, covers 26 % of this area

Alluvium

Edwards Limestone (Early Cretaceous) at surface, covers 20 % of this area

Edwards Limestone

Quaternary deposit, undivided (Quaternary) at surface, covers 19 % of this area

Quaternary deposit, undivided

Washita Group (Early and Late Cretaceous; Comanchean Series) at surface, covers 9 % of this area

Washita Group

Fredericksburg Group (Early Cretaceous; Comanchean Series) at surface, covers 6 % of this area

Fredericksburg Group

Alluvial fan deposits (Pleistocene and Holocene) at surface, covers 5 % of this area

Alluvial fan deposits

Older alluvial deposits (Pleistocene) at surface, covers 4 % of this area

Older alluvial deposits

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

Quaternary-Tertiary deposits, undivided

Terrace deposits (Pleistocene and Holocene) at surface, covers 2 % of this area

Terrace deposits

Buda Limestone (Early Cretaceous) at surface, covers 2 % 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.

Fredericksberg Group and Maxon Sandstone, undivided (Early Cretaceous; Comanchean Series) at surface, covers 1 % of this area

Fredericksberg Group and Maxon Sandstone, undivided

Capitan Formation (Permian; Guadalupe Series) at surface, covers 0.7 % of this area

Capitan Formation

Skinner Ranch and Hess Formations, undivided (Permian; Wolfcamp Series) at surface, covers 0.6 % of this area

Skinner Ranch and Hess Formations, undivided

Tessey Limestone (Permian; Ochoa Series) at surface, covers 0.6 % of this area

Tessey Limestone

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

Santa Elena Limestone

Land slide deposits (Pleistocene and Holocene) at surface, covers 0.3 % of this area

Land slide deposits

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

Maxon Sandstone and Glen Rose Limestone, undivided

Washita and Fredericksburg Groups, undivided (Early Cretaceous; Comanchean Series) at surface, covers 0.2 % of this area

Washita and Fredericksburg Groups, undivided

Word Formation (Permian; Guadalupe Series) at surface, covers 0.2 % of this area

Word 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 0.1 % 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

Dimple Formation (Early Pennsylvanian) at surface, covers 0.1 % of this area

Dimple Formation

Haymond Formation (Early Pennsylvanian) at surface, covers < 0.1 % of this area

Haymond Formation

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

Bissett Conglomerate

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

Bouquillas Formation

Tesnus Formation (Early Pennsylvanian and Late Mississippian) at surface, covers < 0.1 % of this area

Tesnus Formation

Pond deposits (Pleistocene) at surface, covers < 0.1 % of this area

Pond deposits

Cathederal Mountain Formation (Permian; Leonard Series) at surface, covers < 0.1 % of this area

Cathederal Mountain Formation

Gaptank Formation (Early; Middle; and Late Pennsylvanian) at surface, covers < 0.1 % of this area

Gaptank Formation

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

Gypsite deposits

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

Gatuna Formation (Middle (?) Pleistocene) at surface, covers < 0.1 % of this area

Gatuna Formation

Younger volcanic rocks of Davis Mountains area including Brooks Mountain, Goat Canyon, Medley, Barrel Springs, Wild Cherry, Eppenaurer Ranch, Mount Locke, and Merrill Formations (Early Oligocene) 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

Tahoka Formation (Pleistocene; Wisconsinan) at surface, covers < 0.1 % of this area

Tahoka Formation

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

Playa deposits

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

Gulfian rocks, undivided

Sand sheet deposits (Holocene) at surface, covers < 0.1 % of this area

Sand sheet deposits