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Geologic units in Comanche county, Texas

Twin Mountains Formation (Early Cretaceous) at surface, covers 47 % of this area

Twin Mountains Formation

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

Glen Rose Limestone

Walnut Clay (Early Cretaceous) at surface, covers 6 % of this area

Walnut Clay

Paluxy Sand and Glen Rose Limestone, undivided (Early Cretaceous) at surface, covers 6 % of this area

Paluxy Sand and Glen Rose Limestone, undivided

Paluxy Sand (Early Cretaceous) at surface, covers 5 % of this area

Paluxy Sand

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

Alluvium

Pre-Brazos River rocks, undivided (Pennsylvanian; Des Moines Series) at surface, covers 3 % of this area

Pre-Brazos River rocks, undivided

Magdalena Formation (Pennsylvanian to Permian?) at surface, covers 3 % of this area

Magdalena Formation

Brazos River Formation (Pennsylvanian; Des Moines Series) at surface, covers 2 % of this area

Brazos River Formation

Undivided part Fredericksberg Group (Early Cretaceous) at surface, covers 2 % of this area

Undivided part Fredericksberg Group

Antlers Sand (Early Cretaceous) at surface, covers 2 % of this area

Antlers Sand

Wolf Mountain Shale (Pennsylvanian; Missouri Series) at surface, covers 1 % of this area

Wolf Mountain Shale

Comanche Peak Limestone and Walnut Clay, undivided (Early Cretaceous) at surface, covers 0.6 % of this area

Comanche Peak Limestone and Walnut Clay, undivided

Ranger Limestone and Placid Creek Shale, undivided (Pennsylvanian; Missouri Series) at surface, covers 0.5 % of this area

Ranger Limestone and Placid Creek Shale, undivided

Terrace deposits (Pleistocene and Holocene) at surface, covers 0.3 % of this area

Terrace deposits

Winchell Limestone (Pennsylvanian; Missouri Series) at surface, covers 0.3 % of this area

Winchell Limestone

Edwards Limestone (Early Cretaceous) at surface, covers 0.2 % of this area

Edwards Limestone

Home Creek Limestone and Colony Creek Shale, undivided (Pennsylvanian; Missouri Series) at surface, covers < 0.1 % of this area

Home Creek Limestone and Colony Creek Shale, undivided