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Geologic units in Gwinnett county, Georgia

Additional scientific data in this geographic area

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 18 % of this area

Biotitic Gneiss / Mica Schist/ Amphibolite

Metagraywacke/ Mica Schist (Precambrian-Paleozoic) at surface, covers 14 % of this area

Metagraywacke/ Mica Schist

Granite Gneiss/ Amphibolite (Precambrian-Paleozoic) at surface, covers 12 % of this area

Granite Gneiss/ Amphibolite

Amphibolite (Precambrian-Paleozoic) at surface, covers 4 % of this area

Amphibolite

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 2 % of this area

Non-porphyritic granite

Biotitic Gneiss Undifferentiated (Precambrian-Paleozoic) at surface, covers 1 % of this area

Biotitic Gneiss Undifferentiated

Mica Schist/ Amphibolite (Precambrian-Paleozoic) at surface, covers 0.8 % of this area

Mica Schist/ Amphibolite

Mica Schist/ Gneiss/ Amphibolite (Precambrian-Paleozoic) at surface, covers 0.5 % of this area

Mica Schist/ Gneiss/ Amphibolite

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

Quartzite

Mylonite and ultramylonite (Age uncertain) at surface, covers 0.3 % of this area

Mylonite and ultramylonite

Calc-silicate Granite Gneiss (Precambrian-Paleozoic) at surface, covers 0.2 % of this area

Calc-silicate Granite Gneiss

Button Mica Schist (Precambrian-Paleozoic) at surface, covers 0.1 % of this area

Button Mica Schist