Granite undifferentiated
Up-dip equivalent of Twiggs Clay, Sandersville Limestone, and Cooper Marl. As mapped, also includes younger clastics of indefinite Late Tertiary age.
Sericite Schist
Granitic Gneiss undifferentiated
Felsic Metavolcanics
Amphibolite/ Biotitic Gneiss/ Quartz Sericite Schist
Quartz Sericite Schist/ Biotitic Gneiss
Mica Schist/ Gneiss/ Amphibolite
Undifferentiated Metavolcanics/ Sericite phyllite/ Meta-argillite/ Quartz mica schist
As mapped includes Middendorf Formation (Sloan, 1904); "Channel Sands" (LaMoreaux, 1946); Tuscaloosa Formation (Cooke, 1939); and "Huber beds" (Buie, informal terminology)
Quartzite/ Mica Schist
Twiggs Clay
Quartz Mica Schist/ Hornblende Schist/ Biotitic Gneiss
Meta-argillite/ Phyllite
Meta-argillite/ Sericite phyllite/ Metavolcanics
Biotite Gneiss/ Feldspathic Biotite Gneiss
Sericite Schist/ Amphibolite/ Granite gneiss
Granite Gneiss/ Granite