Geologic units in Troup county, Georgia

Hornblende Gneiss/ Amphibolite (Precambrian-Paleozoic) at surface, covers 49 % of this area

Hornblende Gneiss/ Amphibolite

Mica Schist/ Gneiss/ Amphibolite (Precambrian-Paleozoic) at surface, covers 25 % of this area

Mica Schist/ Gneiss/ Amphibolite

Granite Gneiss/ Granite (Precambrian-Paleozoic) at surface, covers 13 % of this area

Granite Gneiss/ Granite

Granite undifferentiated (Precambrian-Paleozoic) at surface, covers 8 % of this area

Granite undifferentiated

Quartzite (Precambrian-Paleozoic) at surface, covers 0.8 % of this area

Quartzite

Mica Schist (Precambrian-Paleozoic) at surface, covers 0.7 % of this area

Mica Schist

Aluminous Schist (Precambrian-Paleozoic) at surface, covers 0.6 % of this area

Aluminous Schist

Granitic Gneiss undifferentiated (Precambrian-Paleozoic) at surface, covers 0.4 % of this area

Granitic Gneiss undifferentiated

Quartzite/ Mica Schist (Precambrian-Paleozoic) at surface, covers 0.4 % of this area

Quartzite/ Mica Schist

Amphibolite (Precambrian-Paleozoic) at surface, covers 0.3 % of this area

Amphibolite

Biotitic Gneiss / Mica Schist/ Amphibolite (Precambrian-Paleozoic) at surface, covers 0.3 % of this area

Biotitic Gneiss / Mica Schist/ Amphibolite

Dadeville Complex; Ropes Creek Amphibolite (Precambrian to Paleozoic) at surface, covers 0.2 % of this area

Layered and massive amphibolite; locally includes hornblende migmatite and ultramafic pods.

Biotitic Gneiss / Amphibolite (Precambrian-Paleozoic) at surface, covers 0.2 % of this area

Biotitic Gneiss / Amphibolite

Dadeville Complex; Rock Mills Granite Gneiss (Precambrian to Paleozoic) at surface, covers < 0.1 % of this area

Coarse to medium-grained biotite granite gneiss; locally includes thick bands of epidote and thin, small amphibolite bodies. Boundary between Rock Mills Granite Gneiss and Camp Hill Granite Gneiss arbitrarily defined.

Dadeville Complex; Agricola Schist (Precambrian to Paleozoic) at surface, covers < 0.1 % of this area

Agricola Schist - biotiite +/- garnet +/- sillimanite-feldspar-quartz schist, interlayered with thin-bedded dark-brown hornblende amphibolite; contains pegmatite pods and veins.

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

Biotite gneiss

Dadeville Complex; Waverly Gneiss (Precambrian to Paleozoic) at surface, covers < 0.1 % of this area

Feldspathic biotite-hornblende gneiss with thin layers of amphibolite, calc-silicate rock, garnet quartzite, and muscovite schist; locally rich in manganese.

Dadeville Complex; Waresville Schist (Precambrian to Paleozoic) at surface, covers < 0.1 % of this area

Banded amphibolite interlayered with chlorite schist, chlorite amphibolite, chlorite-actinolite schist, chlorite +/- magnetite quartzite, and actinolite quartzite; may include small ultramafic pods.