Alluvium
(Holocene) at surface, covers 26 % of this area Alluvium
Edwards Limestone
(Early Cretaceous) at surface, covers 20 % of this area Edwards Limestone
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
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.
Capitan Formation
(Permian; Guadalupe Series) at surface, covers 0.7 % of this area Capitan Formation
Tessey Limestone
(Permian; Ochoa Series) at surface, covers 0.6 % of this area Tessey Limestone
Land slide deposits
(Pleistocene and Holocene) at surface, covers 0.3 % of this area Land slide deposits
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
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
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
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
