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Mineral Resources > Online Spatial Data > Geology > by state > Georgia Geology

Geologic units in DeKalb county, Georgia

Mica Schist/ Gneiss (Precambrian-Paleozoic) at surface, covers 6 % of this area

Mica Schist/ Gneiss

Lithology: mica schist; gneiss

Biotitic Gneiss Undifferentiated (Precambrian-Paleozoic) at surface, covers 9 % of this area

Biotitic Gneiss Undifferentiated

Lithology: biotite gneiss

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

Sillimanite Schist/ Gneiss

Lithology: schist; gneiss

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

Porphyritic granite

Lithology: granite

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

Biotite gneiss

Lithology: biotite gneiss

Non-porphyritic granite (Precambrian-Paleozoic) at surface, covers 4 % of this area

Non-porphyritic granite

Lithology: granite

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

Quartzite/ Mica Schist

Lithology: quartzite; mica schist

Granitic Gneiss undifferentiated (Precambrian-Paleozoic) at surface, covers 9 % of this area

Granitic Gneiss undifferentiated

Lithology: granitic gneiss

Ultramafic rocks undifferentiated (Precambrian-Paleozoic) at surface, covers 3 % of this area

Ultramafic rocks undifferentiated

Lithology: ultramafic intrusive rock

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

Quartzite

Lithology: quartzite

Biotite Gneiss/ Feldspathic Biotite Gneiss (Precambrian-Paleozoic) at surface, covers 2 % of this area

Biotite Gneiss/ Feldspathic Biotite Gneiss

Lithology: biotite gneiss; felsic gneiss

Calc-silicate Granite Gneiss (Precambrian-Paleozoic) at surface, covers 1 % of this area

Calc-silicate Granite Gneiss

Lithology: granitic gneiss

Mica Schist/ Gneiss/ Amphibolite (Precambrian-Paleozoic) at surface, covers 31 % of this area

Mica Schist/ Gneiss/ Amphibolite

Lithology: mica schist; gneiss; amphibolite

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

Metagraywacke/ Mica Schist

Lithology: metasedimentary rock; mica schist

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

Granite Gneiss/ Amphibolite

Lithology: granitic gneiss; amphibolite

Biotitic Gneiss / Mica Schist/ Amphibolite (Precambrian-Paleozoic) at surface, covers 21 % of this area

Biotitic Gneiss / Mica Schist/ Amphibolite

Lithology: biotite gneiss; mica schist; amphibolite

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

Aluminous Schist

Lithology: schist

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

Quartzite/ Mica Schist/ Amphibolite

Lithology: quartzite; mica schist; amphibolite

Button Mica Schist (Precambrian-Paleozoic) at surface, covers 5 % of this area

Button Mica Schist

Lithology: mica schist

Hornblende Gneiss (Precambrian-Paleozoic) at surface, covers 0.2 % of this area

Hornblende Gneiss

Lithology: gneiss