Geologic units in Spartanburg county, South Carolina

Biotite gneiss and muscovite-biotite gneiss (Cambrian or Neoproterozoic) at surface, covers 30 % of this area

Layered biotite-quartz-feldspar gneiss

Gneiss of Laurens area (Cambrian or Neoproterozoic) at surface, covers 17 % of this area

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

Sillimanite-mica schist and muscovite-biotite schist (Cambrian or Neoproterozoic) at surface, covers 11 % of this area

Thin to thick layered sillimanite-mica schist and sillimanite-bearing muscovite-biotite schist

Sillimanite schist and sillimanite-mica schist (Cambrian or Neoproterozoic) at surface, covers 10 % of this area

Sillimanite-rich aluminous schist composed mainly of sillimanite, biotite, muscovite, and minor quartz

Megacrystic biotite gneiss (Cambrian or Neoproterozoic) at surface, covers 7 % of this area

Variably layered biotite-quartz-feldspar gneiss having porphyroclasts and/or porphyroblasts of plagioclase and locally of quartz and potassium feldspar

Reedy River complex (Paleozoic) at surface, covers 6 % of this area

Gneissic biotite granite to granodiorite

Migmatitic granitoid gneiss (Ordovician) at surface, covers 5 % of this area

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

Amphibolite and interlayered biotite gneiss, hornblende gneiss and minor mica schist (Cambrian or Neoproterozoic) at surface, covers 4 % of this area

Amphibolite and interlayered gneiss, hornblende gneiss and minor mica schist

Pacolet granite (Devonian) at surface, covers 3 % of this area

Pacolet granite

Battleground Formation, Mafic to intermediate metavolcanic rocks (Neoproterozoic) at surface, covers 1 % of this area

Battleground Formation, Mafic to intermediate metavolcanic rocks

Battleground Formation, Metasedimentary rocks, undivided (Neoproterozoic) at surface, covers 1 % of this area

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

Battleground Formation, Felsic metavolcanic rocks (Neoproterozoic) at surface, covers 0.6 % of this area

Battleground Formation, Felsic metavolcanic rocks

Toluca Granite and associated metagranites (Ordovician) at surface, covers 0.5 % of this area

Weakly to strongly foliated, garnet-bearing, metamorphosed monzogranite to granodiorite; ranges from equigranular and medium-grained to inequigranular having coarse microcline megacrysts

Metamorphosed granite and granodiorite (Cambrian or Neoproterozoic) at surface, covers 0.5 % of this area

Metamorphosed granite and granodiorite

Enoree melange, Cedar Shoals gneiss and Cross Anchor mafic complex (Age uncertain) at surface, covers 0.5 % of this area

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

Gneissic granite of Greenville (Paleozoic) at surface, covers 0.3 % of this area

Granite gneiss

Gray Court metagranite (Devonian) at surface, covers 0.3 % of this area

Foliated, medium-grained, equigranular to porphyritic biotite granite

Hammett Grove Meta-igneous Suite - ultramafic rocks (Paleozoic or Neoproterozoic) at surface, covers 0.1 % of this area

Metamorphosed ultramafic rocks: hornblendite, pyroxenite, serpentinite and talc schist

Granite (Carboniferous to Permian) at surface, covers 0.1 % of this area

Granite

Inequigranular Biotite Gneiss (Cambrian/Late Proterozoic) at surface, covers < 0.1 % of this area

Weakly foliated to massive, contains plagioclase megacrysts and, rarely, larger megacrysts of quartz and feldspar.

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

Metagabbro and minor metadiorite

Mica Schist (Cambrian/Late Proterozoic) at surface, covers < 0.1 % of this area

Garnet, staurolite, kyanite, or sillimanite occur locally; lenses and layers of quartz schist, micaceous quartzite, calc-silicate rock, biotite gneiss, amphibolite, and phyllite.

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

Ultramafic rock

Migmatitic Granitic Gneiss (Ordovician/Cambrian) at surface, covers < 0.1 % of this area

Foliated to massive, granitic to quartz dioritic; biotite gneiss and amphibolite common.