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Geologic units in Grady county, Georgia

Miccosukee Formation (Neogene) at surface, covers 72 % of this area

Miccosukee Formation

Hawthorn Formation (Miocene) at surface, covers 21 % of this area

Includes Marks Head Formation; Parachucia Beds (Sloan, 1905); and Alum Bluff Formation (Veatch and Stephenson, 1911).

Suwannee Limestone and its residuum (Oligocene) at surface, covers 3 % of this area

As mapped, includes Chattahoochee Limestone in Seminole and Decatur Cos.; Flint River Formation, in part, (Cooke, 1939); Jacksonboro Limestone in Screven Co.; and Glendon and Marianna Limestones in Pulaski Co.

Ocala Limestone (Eocene) at surface, covers 3 % of this area

Generally covered with Oligocene and Eocene residuum (Flint River Formation of Cooke, 1939); includes up-dip area, Tivola Limestone of Connell (1955). (*)- outcrops of Ocala Limestone on Dougherty Plain.