Lynchburg Group - Graphitic phyllite and metasiltstone

Black graphite and pyrite-bearing phyllite and slate, with thin interbeds of sericite phyllite, metasiltstone and quartzite. The unit includes the Johnson Mill graphite slate formation of Nelson (1962); thickness is on the order of 100 m.
State Virginia
Name Lynchburg Group - Graphitic phyllite and metasiltstone
Geologic age Proterozoic Z
Lithologic constituents
Major
Metamorphic > Metasedimentary > Metaclastic > Phyllite
Minor
Metamorphic > Metasedimentary > Metaclastic > Metasiltstonemeta-argillite
Metamorphic > Metasedimentary > Metaclastic > Quartzitemeta-argillite
Metamorphic > Metasedimentary > Metaclastic > Slatemeta-argillite
Comments Blue Ridge Anticlinorium (Central)
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 Albemarle - Culpeper - Madison - Nelson - Orange - Charlottesville