Edwards Limestone
(Early Cretaceous) at surface, covers 53 % of this area Edwards Limestone
Antlers Sand
(Early Cretaceous) at surface, covers 6 % of this area Antlers Sand
Lingos Formation
(Middle (?) Pleistocene to Recent) at surface, covers 6 % of this area Lingos Formation
Alluvium
(Holocene) at surface, covers 4 % of this area Alluvium
Ogallala Formation
(Pliocene to Miocene) at surface, covers 2 % of this area Ogallala Formation
Playa deposits
(Pleistocene and Holocene) at surface, covers < 0.1 % of this area Playa deposits
Quartermaster Formation
(Permian; Guadalupe Series) at surface, covers < 0.1 % of this area Quartermaster Formation; North and central Texas including panhandle.