Geologic units in Gaston county, North Carolina

Foliated to Massive Granitic Rock (Permian/Pennsylvanian) at surface, covers 22 % of this area

Megacrystic to equigranular. High Shoals Granite.

Battleground Formation (Late Proterozoic) at surface, covers 19 % of this area

Quartz-sericite schist with metavolcanic rock, quartz-pebble metaconglomerate, kyanite-sillimanite quartzite, and garnet-quartz rock.

Metamorphosed Quartz Diorite (Paleozoic/Late Proterozoic) at surface, covers 18 % of this area

Foliated to massive.

Mica Schist (Cambrian/Late Proterozoic) at surface, covers 9 % 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.

Blacksburg Formation (Cambrian/Late Proterozoic) at surface, covers 6 % of this area

Sericite schist, locally with graphite, phyllite with sericite quartzite, banded marble, amphibolite, and minor calc-silicate rock.

Felsic Metavolcanic Rock (Cambrian/Late Proterozoic) at surface, covers 5 % of this area

Metamorphosed dacitic to rhyolitic flows and tuffs, light gray to greenish gray; minor mafic and intermediate metavolcanic rock.

Cherryville Granite (Mississippian) at surface, covers 5 % of this area

Massive to weakly foliated; contains pegmatites, lithium-bearing on east side.

Granitic Rock (Devonian/Ordovician) at surface, covers 5 % of this area

Locally pinkish gray, massive to weakly foliated; contains hornblende.

Metamorphosed Granitic Rock (Cambrian/Late Proterozoic) at surface, covers 4 % of this area

Megacrystic, well foliated; locally contains hornblende.

Metamorphosed Quartz Diorite (Paleozoic/Late Proterozoic) at surface, covers 1 % of this area

Foliated to massive.

Amphibolite and Biotite Gneiss (Cambrian/Late Proterozoic) at surface, covers 1 % of this area

Interlayered; minor layers and lenses of hornblende gneiss, metagabbro, mica schist, and granitic rock.

Cherryville Granite (Mississippian) at surface, covers 1 % of this area

Massive to weakly foliated; contains pegmatites.

Metamorphosed Granitic Rock (Ordovician/Cambrian) at surface, covers 0.8 % of this area

Equigranular to megacrystic, foliated to massive. Includes Toluca Granite.

Biotite Gneiss and Schist (Cambrian/Late Proterozoic) at surface, covers 0.4 % of this area

Inequigranular, locally abundant potassic feldspar and garnet; interlayered and gradational with calc-silicate rock, sillimanite-mica schist, mica schist, and amphibolite. Contains small masses of granitic rock.

Metamorphosed granite and granodiorite (Cambrian or Neoproterozoic) at surface, covers < 0.1 % of this area

Metamorphosed granite and granodiorite

Gabbro of Concord Plutonic Suite (Devonian/Ordovician) at surface, covers < 0.1 % of this area

Barber, Concord, Farmington, Mecklenburg, and Weddington intrusives.

Metamorphosed quartz diorite to diorite (Early Paleozoic-Neoproterozoic) at surface, covers < 0.1 % of this area

Metamorphosed quartz diorite to diorite

Battleground Formation, Metasedimentary rocks, undivided (Neoproterozoic) at surface, covers < 0.1 % of this area

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

Felsic metavolcanic rocks and felsic gneiss interpreted to the metavolcanics (Ordovician to Neoproterozoic) at surface, covers < 0.1 % of this area

Felsic metavolcanic rocks and felsic gneiss interpreted to the metavolcanics

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

Metagabbro and minor metadiorite

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

Granite