Alluvium
(Holocene) at surface, covers 49 % of this area Alluvium
Terrace deposits
(Pleistocene and Holocene) at surface, covers 3 % of this area Terrace deposits
Gatuna Formation
(Middle (?) Pleistocene) at surface, covers 2 % of this area Gatuna Formation
Land slide deposits
(Pleistocene and Holocene) at surface, covers 1 % of this area Land slide deposits
Boracho Limestone
(Early Cretaceous) at surface, covers 1 % of this area Boracho Limestone
Buda Limestone
(Early Cretaceous) at surface, covers 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.
Washita Group
(Early and Late Cretaceous; Comanchean Series) at surface, covers 1 % of this area Washita Group
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 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
Tahoka Formation
(Pleistocene; Wisconsinan) at surface, covers 1.0 % of this area Tahoka Formation
Rustler Formation
(Permian; Ochoa Series) at surface, covers 0.7 % of this area Rustler Formation
Gypsite deposits
(Pleistocene and Holocene) at surface, covers 0.7 % of this area Gypsite deposits
Cox Sandstone
(Early Cretaceous) at surface, covers 0.6 % of this area Cox Sandstone
Toy Limestone
(Early (?) Pleistocene) at surface, covers 0.5 % of this area Toy Limestone
Alluvial fan deposits
(Pleistocene and Holocene) at surface, covers 0.3 % of this area Alluvial fan deposits
Finlay Limestone
(Early Cretaceous; Comanchean; Albian Series) at surface, covers < 0.1 % of this area Finlay Limestone
Dewey Lake Red beds
(Permian; Ochoa Series) at surface, covers < 0.1 % of this area Dewey Lake Red beds
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
Rustler Formation
(Upper Permian) at surface, covers < 0.1 % of this area Siltstone, gypsum, sandstone, and dolomite.
Leona Formation
(Pleistocene) at surface, covers < 0.1 % of this area Leona Formation
Alluvium
(Holocene to upper Pleistocene) at surface, covers < 0.1 % of this area Alluvium