Geologic units in Grady county, Georgia

Suwannee Limestone and its residuum (Oligocene) at surface, covers 3 % of this area: Suwannee Limestone and its residuum, 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.
Lithology: limestone
Floyd Shale; Hartselle Sandstone member (Mississippian) at surface, covers 21 % of this area: Hartselle Sandstone member (Mh) in Floyd County
Lithology: sandstone
Miccosukee Formation (Neogene) at surface, covers 72 % of this area: Miccosukee Formation
Lithology: clay or mud; sand; gravel
Ocala Limestone (Eocene) at surface, covers 3 % of this area: Ocala Limestone, 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.
Lithology: limestone