Geologic units in Parker county, Texas

Paluxy Sand (Early Cretaceous) at surface, covers 38 % of this area

Paluxy Sand

Twin Mountains Formation (Early Cretaceous) at surface, covers 14 % of this area

Twin Mountains Formation

Goodland Limestone and Walnut Clay, undivided (Early Cretaceous; Comanchean Series) at surface, covers 9 % of this area

Goodland Limestone and Walnut Clay, undivided

Walnut Clay (Early Cretaceous) at surface, covers 8 % of this area

Walnut Clay

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

Glen Rose Limestone

Kiamichi Formation (Early Cretaceous; Comanchean Series) at surface, covers 5 % of this area

Kiamichi Formation

Mineral Wells Formation (Pennsylvanian; Missouri Series) at surface, covers 3 % of this area

Mineral Wells Formation

Alluvium (Holocene) at surface, covers 3 % of this area

Alluvium

Duck Creek Limestone (Early Cretaceous; Comanchean Series) at surface, covers 3 % of this area

Duck Creek Limestone

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

Lazy Bend Formation

Grindstone Creek Formation, expanded (Pennsylvanian; Des Moines Series) at surface, covers 2 % of this area

Grindstone Creek Formation, expanded

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

Mingus Formation

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

Terrace deposits

Brazos River Formation (Pennsylvanian; Des Moines Series) at surface, covers 1 % of this area

Brazos River Formation

Quaternary deposit, undivided (Quaternary) at surface, covers 0.8 % of this area

Quaternary deposit, undivided

Palo Pinto Formation (Pennsylvanian; Missouri Series) at surface, covers 0.1 % of this area

Palo Pinto Formation

Unnamed Pennsylvanian rocks (Pennsylvanian) at surface, covers 0.1 % of this area

Unnamed Pennsylvanian rocks

Undivided part of Washita Group (Early Cretaceous; Comanchean Series) at surface, covers < 0.1 % of this area

Undivided part of Washita Group

Undivided part Fredericksberg Group (Early Cretaceous) at surface, covers < 0.1 % of this area

Undivided part Fredericksberg Group