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Geologic units in Catawba county, North Carolina

Additional scientific data in this geographic area

Amphibolite and Biotite Gneiss (Cambrian/Late Proterozoic) at surface, covers 33 % of this area

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

Mica Schist (Cambrian/Late Proterozoic) at surface, covers 22 % 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.

Biotite Gneiss and Schist (Cambrian/Late Proterozoic) at surface, covers 16 % 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.

Foliated to Massive Granitic Rock (Permian/Pennsylvanian) at surface, covers 7 % of this area

Megacrystic to equigranular. High Shoals Granite.

Battleground Formation (Late Proterozoic) at surface, covers 5 % of this area

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

Blacksburg Formation (Cambrian/Late Proterozoic) at surface, covers 5 % of this area

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

Metamorphosed Granitic Rock (Ordovician/Cambrian) at surface, covers 3 % of this area

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

Fine-grained Biotite Gneiss (Cambrian/Late Proterozoic) at surface, covers 3 % of this area

Strongly foliated; minor layers of amphibolite and muscovite schist.

Fine-grained Biotite Gneiss (Cambrian/Late Proterozoic) at surface, covers 3 % of this area

Massive to strongly foliated; minor layers of amphibolite and muscovite schist.

Megacrystic Biotite Gneiss (Cambrian/Late Proterozoic) at surface, covers 2 % of this area

Poorly layered to massive; megacrysts of microcline and quartz; local mica schist, amphibolite, and biotite gneiss

Meta-ultramafic Rock (Paleozoic/Late Proterozoic) at surface, covers 0.7 % of this area

Metamorphosed dunite, local peridotite, serpentinite, soapstone, and other ultramafic rock. Only larger bodies shown.

Granitic Rock (Devonian/Ordovician) at surface, covers < 0.1 % of this area

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