Biotite Granite Gneiss/ Feldspathic Biotite Gneiss/ Amphibolite Hornblende Gneiss
As mapped includes Middendorf Formation (Sloan, 1904); "Channel Sands" (LaMoreaux, 1946); Tuscaloosa Formation (Cooke, 1939); and "Huber beds" (Buie, informal terminology)
Biotite gneiss
Granite Gneiss/ Amphibolite
Hornblende Gneiss/ Granite Gneiss/ Biotite Gneiss
Twiggs Clay
Hornblende Gneiss/ Amphibolite
Granitic Gneiss undifferentiated
Granite Gneiss/ Granite
Granite undifferentiated
Up-dip equivalent of Twiggs Clay, Sandersville Limestone, and Cooper Marl. As mapped, also includes younger clastics of indefinite Late Tertiary age.
Biotite Gneiss/ Mica Schist
Amphibolite
Hornblende Gneiss/ Amphibolite/ Granite Gneiss
Mylonite and ultramylonite
Mafic Hornfels