Geologic units in Macon county, Georgia

Eocene undifferentiated (Eocene) at surface, covers 35 % of this area

Highly weathered sands and sandy clays of lower Tertiary age

Providence Sand (Cretaceous) at surface, covers 23 % of this area

Providence Sand, includes Perote Member

Stream alluvium (Quaternary) at surface, covers 11 % of this area

Stream alluvium and undifferentiated terrace deposits

Ripley Formation (Cretaceous) at surface, covers 10 % of this area

Ripley Formation

Nanafalia Formation (Paleocene) at surface, covers 8 % of this area

Nanafalia Formation

Nanafalia, Porters Creek, and Clayton Formations, undifferentiated (Paleocene) at surface, covers 4 % of this area

Nanafalia, Porters Creek, and Clayton Formations, undifferentiated

Claiborne undifferentiated (Eocene) at surface, covers 3 % of this area

Up-dip equivalent of Lisbon and Tallahatta Formations

Cusseta Sand (Cretaceous) at surface, covers 3 % of this area

Cusseta Sand

Eocene and Oligocene Residuum, undifferentiated (Eocene-Oligocene) at surface, covers 0.7 % of this area

Eocene and Oligocene Residuum, undifferentiated

Tuscahoma Sand (Paleocene) at surface, covers 0.7 % of this area

As mapped includes lower Eocene Bashi Marl Member of the Hatchetigbee Formation

Twiggs Clay (Eocene) at surface, covers 0.4 % of this area

Twiggs Clay

Clayton Formation (Paleocene) at surface, covers 0.3 % of this area

Clayton Formation

Suwannee Limestone and its residuum (Oligocene) at surface, covers 0.1 % 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.

Blufftown Formation (Cretaceous) at surface, covers < 0.1 % of this area

Blufftown Formation