Geologic units in McLennan county, Texas

Ozan Formation (Late Cretaceous; Gulfian Series) at surface, covers 17 % of this area

Ozan Formation

Grayson Marl and Main Street Limestone, undivided (Early Late Cretaceous and Late Early Cretaceous) at surface, covers 17 % of this area

Grayson Marl and Main Street Limestone, undivided

Austin Chalk (Late Cretaceous; Gulfian Series) at surface, covers 12 % of this area

Austin Chalk

Terrace deposits (Pleistocene and Holocene) at surface, covers 11 % of this area

Terrace deposits

Alluvium (Holocene) at surface, covers 9 % of this area

Alluvium

Wolfe City Formation (Late Cretaceous; Gulfian Series) at surface, covers 9 % of this area

Wolfe City Formation

Eagle Ford Formation and Woodbine Formations, undivided (Late Cretaceous; Gulfian Series) at surface, covers 7 % of this area

Eagle Ford Formation and Woodbine Formations, undivided

Lower part of Washita Group (Early Cretaceous; Comanchean Series) at surface, covers 7 % of this area

Lower part of Washita Group

Pawpaw Formation and upper limestone unit of Weno Formation, undivided (Early Cretaceous) at surface, covers 5 % of this area

Pawpaw Formation and upper limestone unit of Weno Formation, undivided

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

Undivided part Fredericksberg Group

Eagle Ford Formation (Late Cretaceous) at surface, covers 2 % of this area

Eagle Ford Formation

Pecan Gap Chalk (Late Cretaceous; Gulfian Series) at surface, covers 1 % of this area

Pecan Gap Chalk

Woodbine Formation (Late Cretaceous; Gulfian Series) at surface, covers 0.9 % of this area

Woodbine Formation

High gravel deposits (Pleistocene) at surface, covers 0.4 % of this area

High gravel deposits

Neylandville and Marlbrook Marls, undivided (Late Cretaceous; Gulfian Series) at surface, covers 0.1 % of this area

Neylandville and Marlbrook Marls, undivided

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

Undivided part of Washita Group

Walnut Clay (Early Cretaceous) at surface, covers < 0.1 % of this area

Walnut Clay