Border Gneiss

Border gneiss (Hillhouse, 1960). Pyroxene- and locally graphite-, sulfide-, and garnet-bearing quartzofeldspathic granulite and gneiss; includes platy leucocratic charnockite and charnockite gneiss; surrounds and is intruded by Roseland Anorthosite. Border gneiss is equivalent to banded granulite of Herz and Force (1987), and has been interpreted as in part a paragneiss derived from pre-Grenville-age sedimentary-volcanic rocks (Bartholomew and Lewis, 1984; Herz and Force, 1987).
State Virginia
Name Border Gneiss
Geologic age Proterozoic Y
Lithologic constituents
Major
Metamorphic > Gneiss
Comments Blue Ridge Basement Complex, Middle Proterozoic (Early or Pre-Grenville-Age) Gneisses
References

Virginia Division of Mineral Resources, 1993, Geologic Map of Virginia: Virginia Division of Mineral Resources, scale 1:500,000.

Virginia Division of Mineral Resources, 2003, Digital Representation of the 1993 Geologic Map of Virginia, Publication 174, CD ROM (ISO-9660) contains image file, expanded explanation in pdf, and ESRI shapefiles, scale 1:500,000.

NGMDB product
Counties Amherst - Nelson