Geologic units in Rutherford county, North Carolina

Additional scientific data in this geographic area

Biotite Gneiss and Schist (Cambrian/Late Proterozoic) at surface, covers 32 % 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.

Mica Schist (Cambrian/Late Proterozoic) at surface, covers 20 % 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.

Migmatitic Granitic Gneiss (Ordovician/Cambrian) at surface, covers 18 % of this area

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

Amphibolite and Biotite Gneiss (Cambrian/Late Proterozoic) at surface, covers 12 % of this area

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

Henderson Gneiss (Cambrian) at surface, covers 5 % of this area

Monzonitic to granodioritic; inequigranular.

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

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

Inequigranular Biotite Gneiss (Cambrian/Late Proterozoic) at surface, covers 4 % of this area

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

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

Massive to foliated, granodioritic, migmatitic.

Garnet-Mica Schist (Cambrian/Late Proterozoic) at surface, covers 0.3 % of this area

Interlayered with amphibolite.

Granite Gneiss (Silurian/Ordovician) at surface, covers 0.2 % of this area

Poorly foliated; interlayered with biotite augen gneiss.

Caesars Head Granite Gneiss (Devonian/Silurian) at surface, covers 0.1 % of this area

Equigranular to porphyritic, massive to well foliated; contains biotite and muscovite.

Biotite gneiss and muscovite-biotite gneiss (Cambrian or Neoproterozoic) at surface, covers < 0.1 % of this area

Layered biotite-quartz-feldspar gneiss

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

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

Sillimanite-mica schist and muscovite-biotite schist (Cambrian or Neoproterozoic) at surface, covers < 0.1 % of this area

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