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Geologic units in Rockdale county, Georgia

Granitic Gneiss undifferentiated (Precambrian-Paleozoic) at surface, covers 45 % of this area

Granitic Gneiss undifferentiated

Biotitic Gneiss / Mica Schist/ Amphibolite (Precambrian-Paleozoic) at surface, covers 40 % of this area

Biotitic Gneiss / Mica Schist/ Amphibolite

Biotite Gneiss/ Feldspathic Biotite Gneiss (Precambrian-Paleozoic) at surface, covers 4 % of this area

Biotite Gneiss/ Feldspathic Biotite Gneiss

Garnet Mica Schist/ Amphibolite (Precambrian-Paleozoic) at surface, covers 3 % of this area

Garnet Mica Schist/ Amphibolite

Amphibolite/ Mica Schist/ Biotitic Gneiss (Precambrian-Paleozoic) at surface, covers 2 % of this area

Amphibolite/ Mica Schist/ Biotitic Gneiss

Quartzite/ Mica Schist/ Amphibolite (Precambrian-Paleozoic) at surface, covers 2 % of this area

Quartzite/ Mica Schist/ Amphibolite

Non-porphyritic granite (Precambrian-Paleozoic) at surface, covers 1 % of this area

Non-porphyritic granite

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

Quartzite/ Mica Schist

Sillimanite Schist/ Gneiss (Precambrian-Paleozoic) at surface, covers 0.7 % of this area

Sillimanite Schist/ Gneiss

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

Granite Gneiss/ Amphibolite

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

Sillimanite Schist

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

Mica Schist/ Gneiss/ Amphibolite