Mica Schist (Cambrian/Late Proterozoic)at surface, covers < 0.1 % of this area
Mica Schist - Garnet, staurolite, kyanite, or sillimanite occur locally; lenses and layers of quartz schist, micaceous quartzite, calc-silicate rock, biotite gneiss, amphibolite, and phyllite.
Toluca Granite and associated metagranites: weakly to strongly foliated, garnet-bearing, metamorphosed monzogranite to granodiorite; ranges from equigranular and medium-grained to inequigranular having coarse microcline megacrysts
Biotite Gneiss and Schist - 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.
Battleground Formation - quartz-sericite schist with metavolcanic rock, quartz-pebble metaconglomerate, kyanite-sillimanite quartzite, and garnet-quartz rock.
Blacksburg Formation(Cambrian/Late Proterozoic)at surface, covers < 0.1 % of this area
Blacksburg Formation - sericite schist, locally with graphite, phyllite with sericite quartzite, banded marble, amphibolite, and minor calc-silicate rock.
Blacksburg Formation: metamorphosed sedimentary sequence of interlayered sericite schist and phyllite, sericite quartzite, marble, amphibolite and calc-silicate rock