Biotite Gneiss and Schist

Inequigranular and megacrystic; 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.
State North Carolina
Name Biotite Gneiss and Schist
Geologic age Cambrian/Late Proterozoic
Lithologic constituents
Major
Metamorphic > Metasedimentary > Calc-silicate-rockinterlayered and gradational with calc-silicate rock
Metamorphic > Gneiss > Biotite-gneissBiotite Gneiss - inequigranular and megacrystic; abundant potassic feldspar and garnet
Metamorphic > Schist > Mica-schistSchist - inequigranular and megacrystic; abundant potassic feldspar and garnet; interlayered and gradational with sillimanite-mica schist, mica schist
Minor
Metamorphic > Amphiboliteinterlayered and gradational with amphibolite
Incidental
Igneous > Plutonic > GraniticContains small masses of granitic rock.
References

Rhodes, Thomas S., and Conrad, Stephen G., 1985, Geologic Map of North Carolina: Department of Natural Resources and Community Development, Division of Land Resources, and the NC Geological Survey, compiled by Brown, Philip M., et al, and Parker, John M. III, and in association with the State Geologic Map Advisory Committee, scale 1:500,000.

The North Carolina Dept. of Environment, Health, and Natural Resources, Division of Land Resources, NC Geological Survey, in cooperation with the NC Center for Geographic Information and Analysis, 1998 (updated 2007), Geology - North Carolina (1:250,000), coverage data file geol250. The data represents the digital equivalent of the official State Geology map (1:500,000 scale), but was digitized from (1:250,000 scale) base maps.

NGMDB product
Counties Caswell - Davie - Forsyth - Guilford - Person - Rockingham - Stokes - Yadkin