Geologic units in Crawford county, Georgia

Biotite Gneiss (Precambrian-Paleozoic) at surface, covers 41 % of this area

Biotite gneiss

Cusseta, Blufftown, and Eutaw Formations, undifferentiated (Cretaceous) at surface, covers 20 % of this area

Cusseta, Blufftown, and Eutaw Formations, undifferentiated

Tuscaloosa Formation (Cretaceous) at surface, covers 16 % of this area

Tuscaloosa Formation

Ripley Formation (Cretaceous) at surface, covers 7 % of this area

Ripley Formation

Eocene undifferentiated (Eocene) at surface, covers 7 % of this area

Highly weathered sands and sandy clays of lower Tertiary age

Stream alluvium (Quaternary) at surface, covers 6 % of this area

Stream alluvium and undifferentiated terrace deposits

Mica Schist/ Gneiss/ Amphibolite (Precambrian-Paleozoic) at surface, covers 1 % of this area

Mica Schist/ Gneiss/ Amphibolite

Hornblende Gneiss (Precambrian-Paleozoic) at surface, covers 0.9 % of this area

Hornblende Gneiss

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

Eocene and Oligocene Residuum, undifferentiated

Ultramafic rocks undifferentiated (Precambrian-Paleozoic) at surface, covers < 0.1 % of this area

Ultramafic rocks undifferentiated