Geologic units in Marion county, Georgia

Ripley Formation (Cretaceous) at surface, covers 29 % of this area

Ripley Formation

Cusseta Sand (Cretaceous) at surface, covers 24 % of this area

Cusseta Sand

Providence Sand (Cretaceous) at surface, covers 19 % of this area

Providence Sand, includes Perote Member

Blufftown Formation (Cretaceous) at surface, covers 11 % of this area

Blufftown Formation

Eocene and Oligocene Residuum, undifferentiated (Eocene-Oligocene) at surface, covers 11 % of this area

Eocene and Oligocene Residuum, undifferentiated

Eutaw Formation (Cretaceous) at surface, covers 5 % of this area

Eutaw Formation

Tuscaloosa Formation (Cretaceous) at surface, covers 1 % of this area

Tuscaloosa Formation

Tuscahoma Sand (Paleocene) at surface, covers 0.2 % of this area

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

Nanafalia, Porters Creek, and Clayton Formations, undifferentiated (Paleocene) at surface, covers < 0.1 % of this area

Nanafalia, Porters Creek, and Clayton Formations, undifferentiated

Stream alluvium (Quaternary) at surface, covers < 0.1 % of this area

Stream alluvium and undifferentiated terrace deposits