Geologic units in Lee county, Mississippi

Ripley formation (Upper Cretaceous) at surface, covers < 0.1 % of this area: Ripley formation - (Selma group), gray to greenish-gray fine glauconitic sand, clay, and sandy limestone; south of Oktibbeha County is very sandy micaceous chalk.
Lithology: sand; clay or mud; limestone; mixed clastic/carbonate
Demopolis chalk (Upper Cretaceous) at surface, covers 47 % of this area: Demopolis chalk - (Selma group), Chalk and marly chalk containing fewer impurities than underlying and overlying formations.
Lithology: carbonate
Eutaw formation (Tombigbee sand member) (Late Cretaceous) at surface, covers 2 % of this area: Eutaw formation (Tombigbee sand member) - massive fine glauconitic sand.
Lithology: sand
Mooreville chalk (Upper Cretaceous) at surface, covers 15 % of this area: Mooreville chalk - (Selma group), Marly chalk and calcareous clay.
Lithology: carbonate; clay or mud
Coffee sand (Upper Cretaceous) at surface, covers 37 % of this area: Coffee sand - (Selma group), Light-gray cross-bedded to massive glauconitic sand and sandy clay and calcareous sandstone.
Lithology: sand; clay or mud; calcarenite