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Geologic units in Bell county, Texas

Undivided parts of Washita and Fredericksberg Groups (Early Cretaceous) at surface, covers 17 % of this area

Undivided parts of Washita and Fredericksberg Groups

Walnut Clay (Early Cretaceous) at surface, covers 16 % of this area

Walnut Clay

Ozan Formation (Late Cretaceous; Gulfian Series) at surface, covers 13 % of this area

Ozan Formation

Austin Chalk (Late Cretaceous; Gulfian Series) at surface, covers 11 % of this area

Austin Chalk

Edwards and Comanche Peak Limestones, undivided (Early Cretaceous) at surface, covers 6 % of this area

Edwards and Comanche Peak Limestones, undivided

Glen Rose Limestone (Early Cretaceous) at surface, covers 5 % of this area

Glen Rose Limestone

Navarro and Taylor Groups, undivided (Late Cretaceous; Gulfian Series) at surface, covers 5 % of this area

Navarro and Taylor Groups, undivided

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

Alluvium

High gravel deposits (Pleistocene) at surface, covers 4 % of this area

High gravel deposits

Pecan Gap Chalk (Late Cretaceous; Gulfian Series) at surface, covers 4 % of this area

Pecan Gap Chalk

Navarro Group and Marlbrook Marl, undivided (Late Cretaceous; Gulfian Series) at surface, covers 3 % of this area

Navarro Group and Marlbrook Marl, undivided

Buda Limestone and Del Rio Clay, undivided (Late Cretaceous) at surface, covers 3 % of this area

Buda Limestone and Del Rio Clay, undivided; Eastern part of Trans-Pecos and High Plains and Western part of Trans-Pecos and North, central, and south Texas including Quaternary for all of west Texas.

Terrace deposits (Pleistocene and Holocene) at surface, covers 2 % of this area

Terrace deposits

Georgetown Limestone (Early Cretaceous) at surface, covers 2 % of this area

Georgetown Limestone

Eagle Ford Formation and Woodbine Formations, undivided (Late Cretaceous; Gulfian Series) at surface, covers 2 % of this area

Eagle Ford Formation and Woodbine Formations, undivided

Grayson Marl and Main Street Limestone, undivided (Early Late Cretaceous and Late Early Cretaceous) at surface, covers 0.6 % of this area

Grayson Marl and Main Street Limestone, undivided

Eagle Ford Formation (Late Cretaceous) at surface, covers 0.4 % of this area

Eagle Ford Formation