Geologic units in Hart county, Georgia

Additional scientific data in this geographic area

Sillimanite Schist/ Gneiss/ Amphibolite (Precambrian-Paleozoic) at surface, covers 45 % of this area

Sillimanite Schist/ Gneiss/ Amphibolite

Biotite Gneiss/ Feldspathic Biotite Gneiss (Precambrian-Paleozoic) at surface, covers 27 % of this area

Biotite Gneiss/ Feldspathic Biotite Gneiss

Granite undifferentiated (Precambrian-Paleozoic) at surface, covers 8 % of this area

Granite undifferentiated

Biotite Granite Gneiss/ Feldspathic Biotite Gneiss/ Amphibolite Hornblende Gneiss (Precambrian-Paleozoic) at surface, covers 7 % of this area

Biotite Granite Gneiss/ Feldspathic Biotite Gneiss/ Amphibolite Hornblende Gneiss

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

Sillimanite Schist/ Gneiss

Aluminous Schist (Precambrian-Paleozoic) at surface, covers 2 % of this area

Aluminous Schist

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

Hornblende Gneiss/ Amphibolite

Sillimanite Schist (Precambrian-Paleozoic) at surface, covers 2 % of this area

Sillimanite Schist

Granitic Gneiss undifferentiated (Precambrian-Paleozoic) at surface, covers 2 % of this area

Granitic Gneiss undifferentiated

Biotitic Gneiss / Mica Schist/ Amphibolite (Precambrian-Paleozoic) at surface, covers 0.9 % of this area

Biotitic Gneiss / Mica Schist/ Amphibolite

Migmatitic granitoid gneiss (Ordovician) at surface, covers 0.3 % of this area

Variably foliated, variably migmatitic, and granitic to quartz dioritic in composition

Biotite-plagioclase-quartz gneiss and biotite-muscovite schist (Cambrian or Neoproterozoic) at surface, covers 0.3 % of this area

Variably interlayered, containing subordinate layers of amphibolite and sillimanite-mica schist

Biotite Gneiss/ Amphibolite (Age uncertain) at surface, covers 0.1 % of this area

Biotite Gneiss/ Amphibolite

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

Garnet Mica Schist

Gneissic granite of Starr (Silurian to Ordovician) at surface, covers < 0.1 % of this area

Gneissic biotite granite to granodiorite of Starr pluton and nearby satellite plutons

Wallhalla metamorphic suite (Cambrian or Neoproterozoic) at surface, covers < 0.1 % of this area

Predominately hornblende-plagioclase gneiss and amphibolite, locally having interlayers of biotite-quartz-feldspar gneiss, undivided