Quartermaster Formation
(Permian; Guadalupe Series) at surface, covers 41 % of this area Quartermaster Formation; North and central Texas including panhandle.
Alluvium
(Holocene) at surface, covers 4 % of this area Alluvium
Lingos Formation
(Middle (?) Pleistocene to Recent) at surface, covers 3 % of this area Lingos Formation
Terrace deposits
(Pleistocene and Holocene) at surface, covers 2 % of this area Terrace deposits
Ogallala Formation
(Pliocene to Miocene) at surface, covers < 0.1 % of this area Ogallala Formation
Edwards Limestone
(Early Cretaceous) at surface, covers < 0.1 % of this area Edwards Limestone