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

Geologic units in Hancock county, Georgia

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

Quartz Mica Schist/ Hornblende Schist/ Biotitic Gneiss

Lithology: mica schist; amphibole schist; biotite gneiss

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

Quartzite/ Mica Schist

Lithology: quartzite; mica schist

Ultramafic rocks undifferentiated (Precambrian-Paleozoic) at surface, covers < 0.1 % of this area

Ultramafic rocks undifferentiated

Lithology: ultramafic intrusive rock

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

Quartz Sericite Schist/ Biotitic Gneiss

Lithology: schist; biotite gneiss

Undifferentiated Metavolcanics/ Sericite phyllite/ Meta-argillite/ Quartz mica schist (Precambrian-Paleozoic) at surface, covers 18 % of this area

Undifferentiated Metavolcanics/ Sericite phyllite/ Meta-argillite/ Quartz mica schist

Lithology: metavolcanic rock; phyllite; schist

Amphibolite/ Biotitic Gneiss/ Quartz Sericite Schist (Precambrian-Paleozoic) at surface, covers 0.4 % of this area

Amphibolite/ Biotitic Gneiss/ Quartz Sericite Schist

Lithology: amphibolite; biotite gneiss; schist

Biotite Gneiss/ Feldspathic Biotite Gneiss (Precambrian-Paleozoic) at surface, covers 14 % of this area

Biotite Gneiss/ Feldspathic Biotite Gneiss

Lithology: biotite gneiss; felsic gneiss

Irwinton Sand (Eocene) at surface, covers 15 % of this area

Irwinton Sand (Ei), up-dip equivalent of Twiggs Clay, Sandersville Limestone, and Cooper Marl. As mapped, also includes younger clastics of indefinite Late Tertiary age.

Lithology: sand

Lower Tertiary-Cretaceous undifferentiated (Lower Tertiary-Cretaceous) at surface, covers 0.4 % of this area

Lower Tertiary-Cretaceous undifferentiated, as mapped includes Middendorf Formation (Sloan, 1904); "Channel Sands" (LaMoreaux, 1946); Tuscaloosa Formation (Cooke, 1939); and "Huber beds" (Buie, informal terminology)

Lithology: sand; clay or mud

Meta-argillite/ Phyllite (Precambrian-Paleozoic) at surface, covers 0.9 % of this area

Meta-argillite/ Phyllite

Lithology: metasedimentary rock; phyllite

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

Hornblende Gneiss/ Granite Gneiss/ Biotite Gneiss

Lithology: gneiss; granitic gneiss; biotite gneiss

Granite undifferentiated (Precambrian-Paleozoic) at surface, covers 22 % of this area

Granite undifferentiated

Lithology: granite

Twiggs Clay (Eocene) at surface, covers < 0.1 % of this area

Twiggs Clay

Lithology: clay or mud

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

Biotitic Gneiss / Amphibolite

Lithology: biotite gneiss; amphibolite

Granite/ gneissic biotite granite (Precambrian-Paleozoic) at surface, covers 1 % of this area

Granite/ gneissic biotite granite

Lithology: granite

Porphyritic granite (Precambrian-Paleozoic) at surface, covers 0.2 % of this area

Porphyritic granite

Lithology: granite

Biotite Granite Gneiss/ Feldspathic Biotite Gneiss/ Amphibolite Hornblende Gneiss (Precambrian-Paleozoic) at surface, covers 20 % of this area

Biotite Granite Gneiss/ Feldspathic Biotite Gneiss/ Amphibolite Hornblende Gneiss

Lithology: granitic gneiss; biotite gneiss; amphibolite