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Geologic units in Falls county, Texas

Alluvium (Holocene) at surface, covers 19 % of this area

Alluvium

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

Wolfe City Formation

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

Ozan Formation

Neylandville and Marlbrook Marls, undivided (Late Cretaceous; Gulfian Series) at surface, covers 12 % of this area

Neylandville and Marlbrook Marls, undivided

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

Pecan Gap Chalk

Terrace deposits (Pleistocene and Holocene) at surface, covers 6 % of this area

Terrace deposits

Kemp clay (Late Cretaceous; Gulfian Series) at surface, covers 5 % of this area

Kemp clay

Nacatoch Sand (Late Cretaceous; Gulfian Series) at surface, covers 5 % of this area

Nacatoch Sand

Hooper Formation (Paleocene) at surface, covers 4 % of this area

Hooper Formation

Navarro Group and Marlbrook Marl, undivided (Late Cretaceous; Gulfian Series) at surface, covers 4 % of this area

Navarro Group and Marlbrook Marl, undivided

Kincaid Formation (Paleocene) at surface, covers 3 % of this area

Kincaid Formation

Wills Point Formation (Paleocene) at surface, covers 3 % of this area

Wills Point Formation

Simsboro Formation (Paleocene) at surface, covers 1 % of this area

Simsboro Formation

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

Austin Chalk

Calvert Bluff Formation (Paleocene to Eocene) at surface, covers 0.4 % of this area

Calvert Bluff Formation

Midway Group, undivided (Paleocene) at surface, covers 0.4 % of this area

Midway Group, undivided