Edwards Limestone
(Early Cretaceous) at surface, covers 23 % of this area Edwards Limestone
Ogallala Formation
(Pliocene to Miocene) at surface, covers 2 % of this area Ogallala Formation
Alluvium
(Holocene) at surface, covers 1 % of this area Alluvium
Antlers Sand
(Early Cretaceous) at surface, covers 0.6 % of this area Antlers Sand
Playa deposits
(Pleistocene and Holocene) at surface, covers 0.4 % of this area Playa deposits
Tahoka Formation
(Pleistocene; Wisconsinan) at surface, covers 0.2 % of this area Tahoka Formation
Terrace deposits
(Pleistocene and Holocene) at surface, covers 0.1 % of this area Terrace deposits
Caliche deposits
(Pleistocene and Holocene) at surface, covers < 0.1 % of this area Caliche deposits