Geologic units in Baldwin county, Georgia

Hornblende Gneiss/ Granite Gneiss/ Biotite Gneiss (Precambrian-Paleozoic) at surface, covers 32 % of this area

Hornblende Gneiss/ Granite Gneiss/ Biotite Gneiss

Lower Tertiary-Cretaceous undifferentiated (Lower Tertiary-Cretaceous) at surface, covers 22 % of this area

As mapped includes Middendorf Formation (Sloan, 1904); "Channel Sands" (LaMoreaux, 1946); Tuscaloosa Formation (Cooke, 1939); and "Huber beds" (Buie, informal terminology)

Undifferentiated Metavolcanics/ Sericite phyllite/ Meta-argillite/ Quartz mica schist (Precambrian-Paleozoic) at surface, covers 15 % of this area

Undifferentiated Metavolcanics/ Sericite phyllite/ Meta-argillite/ Quartz mica schist

Quartzite/ Mica Schist (Precambrian-Paleozoic) at surface, covers 10 % of this area

Quartzite/ Mica Schist

Granite/ gneissic biotite granite (Precambrian-Paleozoic) at surface, covers 5 % of this area

Granite/ gneissic biotite granite

Irwinton Sand (Eocene) at surface, covers 5 % of this area

Up-dip equivalent of Twiggs Clay, Sandersville Limestone, and Cooper Marl. As mapped, also includes younger clastics of indefinite Late Tertiary age.

Stream alluvium (Quaternary) at surface, covers 5 % of this area

Stream alluvium and undifferentiated terrace deposits

Biotite Granite Gneiss/ Feldspathic Biotite Gneiss/ Amphibolite Hornblende Gneiss (Precambrian-Paleozoic) at surface, covers 3 % of this area

Biotite Granite Gneiss/ Feldspathic Biotite Gneiss/ Amphibolite Hornblende Gneiss

Biotite Gneiss/ Feldspathic Biotite Gneiss (Precambrian-Paleozoic) at surface, covers 1 % of this area

Biotite Gneiss/ Feldspathic Biotite Gneiss

Twiggs Clay (Eocene) at surface, covers 0.7 % of this area

Twiggs Clay

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

Granitic Gneiss undifferentiated

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

Ultramafic rocks undifferentiated