Geologic units in Union county, South Carolina

Granite - Bald Rock pluton (Carboniferous to Permian) at surface, covers 31 % of this area

Granite - Bald Rock pluton

biotite-quartz-feldspar gneiss of the Whitmire reentrant (Cambrian and/or Neoproterozoic) at surface, covers 16 % of this area

Biotite-quartz-feldspar gneiss

Metamorphosed granite and granodiorite (Cambrian or Neoproterozoic) at surface, covers 11 % of this area

Metamorphosed granite and granodiorite

Metamorphosed granitoid rocks, undivided (Paleozoic to Neoproterozoic) at surface, covers 10 % of this area

Metamorphosed granitoid rocks, undivided

Battleground Formation, Mafic to intermediate metavolcanic rocks (Neoproterozoic) at surface, covers 7 % of this area

Battleground Formation, Mafic to intermediate metavolcanic rocks

Lockhart metadiorite (Early Paleozoic-Neoproterozoic) at surface, covers 5 % of this area

Metadiorite and minor metagabbro, containing sparse hornblendite and pyroxenite

Santuck granite (Paleozoic) at surface, covers 4 % of this area

Santuck granite

Mean Crossroads intrusive complex (Early Paleozoic-Neoproterozoic) at surface, covers 3 % of this area

Metadiorite and minor metagabbro, containing sparse hornblendite and pyroxenite

Philson Crossroads complex (Age uncertain) at surface, covers 3 % of this area

Biotite-quartz-feldspar gneiss having interlayers of amphibolite and metagranite

Wildcat Branch complex (Early Paleozoic-Neoproterozoic) at surface, covers 2 % of this area

Metadiorite and minor metagabbro, containing sparse hornblendite and pyroxenite

Biotite gneiss with interlayered marble, calcsilicate gneiss, sillimanite-muscovite schist, and garnet-quartz rock (Age uncertain) at surface, covers 2 % of this area

Biotite gneiss having interlayered marble, calc-silicate rock, sillimanite-muscovite schist, and garnet-quartz rock

Gabbro - Buffalo pluton (Devonian to Silurian) at surface, covers 1 % of this area

Gabbro - Buffalo pluton

Gneiss of Laurens area (Cambrian or Neoproterozoic) at surface, covers 0.9 % of this area

Biotite-quartz-plagioclase gneiss and interlayers locally containing hornblende, sillimanite, microcline, and muscovite

Battleground Formation, Felsic metavolcanic rocks (Neoproterozoic) at surface, covers 0.8 % of this area

Battleground Formation, Felsic metavolcanic rocks

Amphibolite and amphibolite gneiss (Paleozoic to Neoproterozoic) at surface, covers 0.7 % of this area

Amphibolite and amphibolite gneiss

Pacolet granite (Devonian) at surface, covers 0.7 % of this area

Pacolet granite

Diorite (Age uncertain) at surface, covers 0.6 % of this area

Includes unmetamorphosed, undeformed biotite-hornblende diorite

Battleground Formation, Metasedimentary rocks, undivided (Neoproterozoic) at surface, covers 0.5 % of this area

Quartz-sericite schist/phyllite and interlayered quartzite, quartz-pebble conglomerate, high-alumina quartzite, and manganiferous schist

Syenite - Buffalo pluton (Devonian to Silurian) at surface, covers 0.5 % of this area

Syenite - Buffalo pluton

Metagabbro - Chester (Middle Paleozoic to Neoproterozoic) at surface, covers 0.3 % of this area

Metagabbro and minor metadiorite

Enoree melange, Cedar Shoals gneiss and Cross Anchor mafic complex (Age uncertain) at surface, covers 0.2 % of this area

Cedar Shoals gneiss is biotite-quartz-feldspar gneiss interpreted as metagraywacke; interlayered felsic gneiss interpreted as metavolcanic rock.

Ultramafic rock (Paleozoic or Neoproterozoic) at surface, covers < 0.1 % of this area

Ultramafic rock

Metagabbro and minor metadiorite (Middle Paleozoic to Neoproterozoic) at surface, covers < 0.1 % of this area

Metagabbro and minor metadiorite

Mylonite gneiss (Late Paleozoic) at surface, covers < 0.1 % of this area

Mylonite gneiss