Grandfather Mountain Formation; Metasiltstone

Locally contains thin bedded iron-bearing dolomitic marble; interlayered with phyllite, metagraywacke, and meta-arkose.
State North Carolina
Name Grandfather Mountain Formation; Metasiltstone
Geologic age Late Proterozoic
Lithologic constituents
Major
Metamorphic > Metasedimentary > Metaclastic > Metasiltstonemetasiltstone interlayered with metagraywacke, and meta-arkose
Minor
Metamorphic > Metasedimentary > Metaclastic > Metasandstonemeta-arkose
Metamorphic > Metasedimentary > Metacarbonate > Marblelocally contains thin bedded iron-bearing dolomitic marble
Metamorphic > Metasedimentary > Metaclastic > Metasandstone > Metagraywackemetasiltstone interlayered with metagraywacke, and meta-arkose
Metamorphic > Metasedimentary > Metaclastic > Phylliteinterlayered with phyllite
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 Avery - Burke - Caldwell - Watauga