Lissie Formation
(Quaternary; Middle Pleistocene) at surface, covers 31 % of this area Lissie Formation
Willis Formation
(Pliocene) at surface, covers 30 % of this area Willis Formation
Alluvium
(Holocene) at surface, covers 14 % of this area Alluvium
Terrace deposits
(Pleistocene and Holocene) at surface, covers 4 % of this area Terrace deposits
Goliad Formation
(Miocene) at surface, covers 0.2 % of this area Goliad Formation