Geologic units in Cumberland county, North Carolina

Black Creek Formation (Cretaceous) at surface, covers 40 % of this area: Black Creek Formation - clay, gray to black, lignitic; contains thin beds and laminae of fine-grained micaceous sand and thick lenses of cross-bedded sand. Glauconitic, fossiliferous clayey sand lenses in upper part.
Lithology: clay or mud; sand
Middendorf Formation (Cretaceous) at surface, covers 21 % of this area: Middendorf Formation - sand, sandstone, and mudstone, gray to pale gray with an orange cast, mottled; clay balls and iron-cemented concretions common, beds laterally discontinuous, cross-bedding common.
Lithology: sand; sandstone; mudstone; clay or mud
Cape Fear Formation (Cretaceous) at surface, covers 39 % of this area: Cape Fear Formation - sandstone and sandy mudstone, yellowish gray to bluish gray, mottled red to yellowish orange, indurated, graded and laterally continuos bedding, blocky clay, faint cross-bedding, feldspar and mica common.
Lithology: sandstone; mudstone; sand; clay or mud