Geologic units in Coryell county, Texas

Walnut Clay (Early Cretaceous) at surface, covers 33 % of this area

Walnut Clay

Paluxy Sand and Glen Rose Limestone, undivided (Early Cretaceous) at surface, covers 17 % of this area

Paluxy Sand and Glen Rose Limestone, undivided

Undivided part Fredericksberg Group (Early Cretaceous) at surface, covers 16 % of this area

Undivided part Fredericksberg Group

Lower part of Washita Group (Early Cretaceous; Comanchean Series) at surface, covers 10 % of this area

Lower part of Washita Group

Undivided parts of Washita and Fredericksberg Groups (Early Cretaceous) at surface, covers 9 % of this area

Undivided parts of Washita and Fredericksberg Groups

Glen Rose Limestone (Early Cretaceous) at surface, covers 7 % of this area

Glen Rose Limestone

Alluvium (Holocene) at surface, covers 5 % of this area

Alluvium

Grayson Marl and Main Street Limestone, undivided (Early Late Cretaceous and Late Early Cretaceous) at surface, covers 2 % of this area

Grayson Marl and Main Street Limestone, undivided

Terrace deposits (Pleistocene and Holocene) at surface, covers 1 % of this area

Terrace deposits

Pawpaw Formation and upper limestone unit of Weno Formation, undivided (Early Cretaceous) at surface, covers 0.2 % of this area

Pawpaw Formation and upper limestone unit of Weno Formation, undivided