Flat Rock Granite

Flat Rock granite (Reilly, 1980). Light-gray, medium to coarse-grained, homogenous, foliated granite. Mineralogy: microcline + plagioclase + quartz + biotite; accessory minerals include garnet, apatite, fluorite, and zircon. The Flat Rock intrudes the State Farm Gneiss (Ysf).
State Virginia
Name Flat Rock Granite
Geologic age Proterozoic
Lithologic constituents
Major
Igneous > Plutonic > Granitic > Granite
Comments Eastern Piedmont
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 Powhatan