Ogallala Formation
(Pliocene to Miocene) at surface, covers 14 % of this area Ogallala Formation
Lingos Formation
(Middle (?) Pleistocene to Recent) at surface, covers 4 % of this area Lingos Formation
Quartermaster Formation
(Permian; Guadalupe Series) at surface, covers 1 % of this area Quartermaster Formation; North and central Texas including panhandle.
Playa deposits
(Pleistocene and Holocene) at surface, covers 1 % of this area Playa deposits
Alluvium
(Holocene) at surface, covers 0.4 % of this area Alluvium
Blanco Formation
(Pliocene) at surface, covers 0.3 % of this area Blanco Formation
Terrace deposits
(Pleistocene and Holocene) at surface, covers 0.2 % of this area Terrace deposits