Geologic units in Delta county, Texas

Marlbrook Marl (Late Cretaceous; Gulfian Series) at surface, covers 45 % of this area

Marlbrook Marl

Alluvium (Holocene) at surface, covers 25 % of this area

Alluvium

Terrace deposits (Pleistocene and Holocene) at surface, covers 10 % of this area

Terrace deposits

Neylandville Marl (Late Cretaceous; Gulfian Series) at surface, covers 9 % of this area

Neylandville Marl

Pecan Gap Chalk (Late Cretaceous; Gulfian Series) at surface, covers 5 % of this area

Pecan Gap Chalk

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

Navarro Group, undivided

Wolfe City Formation (Late Cretaceous; Gulfian Series) at surface, covers 2 % of this area

Wolfe City Formation

Ozan Formation (Late Cretaceous; Gulfian Series) at surface, covers 0.2 % of this area

Ozan Formation

Kincaid Formation (Paleocene) at surface, covers < 0.1 % of this area

Kincaid Formation

Wills Point Formation (Paleocene) at surface, covers < 0.1 % of this area

Wills Point Formation