Paluxy Sand
(Early Cretaceous) at surface, covers 30 % of this area Paluxy Sand
Glen Rose Limestone
(Early Cretaceous) at surface, covers 28 % of this area Glen Rose Limestone
Walnut Clay
(Early Cretaceous) at surface, covers 13 % of this area Walnut Clay
Mingus Formation
(Pennsylvanian; Des Moines Series) at surface, covers 4 % of this area Mingus Formation
Alluvium
(Holocene) at surface, covers 2 % of this area Alluvium
Brazos River Formation
(Pennsylvanian; Des Moines Series) at surface, covers 2 % of this area Brazos River Formation
Lazy Bend Formation
(Pennsylvanian; Des Moines Series) at surface, covers 0.3 % of this area Lazy Bend Formation
Terrace deposits
(Pleistocene and Holocene) at surface, covers < 0.1 % of this area Terrace deposits