Geologic units in Clayton county, Georgia

Hornblende Gneiss/ Amphibolite (Precambrian-Paleozoic) at surface, covers < 0.1 % of this area: Hornblende Gneiss/ Amphibolite
Lithology: gneiss; amphibolite
Biotitic Gneiss / Mica Schist/ Amphibolite (Precambrian-Paleozoic) at surface, covers 7 % of this area: Biotitic Gneiss / Mica Schist/ Amphibolite
Lithology: biotite gneiss; mica schist; amphibolite
Granite Gneiss/ Amphibolite (Precambrian-Paleozoic) at surface, covers 74 % of this area: Granite Gneiss/ Amphibolite
Lithology: granitic gneiss; amphibolite
Hornblende Gneiss (Precambrian-Paleozoic) at surface, covers 5 % of this area: Hornblende Gneiss
Lithology: gneiss
Ultramafic rocks undifferentiated (Precambrian-Paleozoic) at surface, covers 0.3 % of this area: Ultramafic rocks undifferentiated
Lithology: ultramafic intrusive rock
Hornblende-Biotite Gneiss/ Amphibolite (Precambrian-Paleozoic) at surface, covers 9 % of this area: Hornblende-Biotite Gneiss/ Amphibolite
Lithology: mafic gneiss; amphibolite
Mica Schist/ Gneiss/ Amphibolite (Precambrian-Paleozoic) at surface, covers 4 % of this area: Mica Schist/ Gneiss/ Amphibolite
Lithology: mica schist; gneiss; amphibolite