Geologic units in Hamilton county, Texas

Walnut Clay (Early Cretaceous) at surface, covers 48 % of this area

Walnut Clay

Paluxy Sand and Glen Rose Limestone, undivided (Early Cretaceous) at surface, covers 26 % of this area

Paluxy Sand and Glen Rose Limestone, undivided

Undivided part Fredericksberg Group (Early Cretaceous) at surface, covers 13 % of this area

Undivided part Fredericksberg Group

Glen Rose Limestone (Early Cretaceous) at surface, covers 4 % of this area

Glen Rose Limestone

Alluvium (Holocene) at surface, covers 4 % of this area

Alluvium

Paluxy Sand (Early Cretaceous) at surface, covers 4 % of this area

Paluxy Sand

Lower part of Washita Group (Early Cretaceous; Comanchean Series) at surface, covers 1 % of this area

Lower part of Washita Group

Terrace deposits (Pleistocene and Holocene) at surface, covers 0.8 % of this area

Terrace deposits

Twin Mountains Formation (Early Cretaceous) at surface, covers 0.2 % of this area

Twin Mountains Formation