Alluvium
(Holocene) at surface, covers 15 % of this area Alluvium
Hooper Formation
(Paleocene) at surface, covers 7 % of this area Hooper Formation
Queen City Sand
(Eocene) at surface, covers 6 % of this area Queen City Sand
Terrace deposits
(Pleistocene and Holocene) at surface, covers 6 % of this area Terrace deposits
Carizzo Sand
(Eocene) at surface, covers 2 % of this area Carizzo Sand
Kemp clay
(Late Cretaceous; Gulfian Series) at surface, covers 0.9 % of this area Kemp clay
Weches Formation
(Eocene) at surface, covers 0.6 % of this area Weches Formation
Sparta Sand
(Eocene) at surface, covers 0.4 % of this area Sparta Sand
Nacatoch Sand
(Late Cretaceous; Gulfian Series) at surface, covers < 0.1 % of this area Nacatoch Sand
Pecan Gap Chalk
(Late Cretaceous; Gulfian Series) at surface, covers < 0.1 % of this area Pecan Gap Chalk