Edwards Limestone
(Early Cretaceous) at surface, covers 46 % of this area Edwards Limestone
Hensell Sand
(Early Cretaceous; Comanchean Series) at surface, covers 22 % of this area Hensell Sand
Glen Rose Limestone
(Early Cretaceous) at surface, covers 17 % of this area Glen Rose Limestone
Town Mountain Granite
(preCambrian (Proterozoic)) at surface, covers 3 % of this area Town Mountain Granite
Alluvium
(Holocene) at surface, covers 2 % of this area Alluvium
Big Branch Gneiss
(preCambrian (Proterozoic)) at surface, covers 1 % of this area Big Branch Gneiss
Tanyard Formation
(Early Ordovician) at surface, covers 1 % of this area Tanyard Formation
Packsaddle Schist
(preCambrian (Proterozoic); Llano Series) at surface, covers 1 % of this area Packsaddle Schist
Valley Spring Gneiss
(preCambrian (Proterozoic)) at surface, covers 0.8 % of this area Valley Spring Gneiss
Sparta Sand
(Eocene) at surface, covers 0.3 % of this area Sparta Sand
Gorman Formation
(Early Ordovician) at surface, covers 0.2 % of this area Gorman Formation
Caliche deposits
(Pleistocene and Holocene) at surface, covers 0.2 % of this area Caliche deposits
Mafic igneous rocks
(preCambrian (Proterozoic)) at surface, covers 0.2 % of this area Mafic igneous rocks
Terrace deposits
(Pleistocene and Holocene) at surface, covers 0.1 % of this area Terrace deposits