Alluvium
(Holocene) at surface, covers 19 % of this area Alluvium
Wolfe City Formation
(Late Cretaceous; Gulfian Series) at surface, covers 13 % of this area Wolfe City Formation
Ozan Formation
(Late Cretaceous; Gulfian Series) at surface, covers 12 % of this area Ozan Formation
Pecan Gap Chalk
(Late Cretaceous; Gulfian Series) at surface, covers 11 % of this area Pecan Gap Chalk
Terrace deposits
(Pleistocene and Holocene) at surface, covers 6 % of this area Terrace deposits
Kemp clay
(Late Cretaceous; Gulfian Series) at surface, covers 5 % of this area Kemp clay
Nacatoch Sand
(Late Cretaceous; Gulfian Series) at surface, covers 5 % of this area Nacatoch Sand
Hooper Formation
(Paleocene) at surface, covers 4 % of this area Hooper Formation
Austin Chalk
(Late Cretaceous; Gulfian Series) at surface, covers 1 % of this area Austin Chalk