Yadkin Formation (NCCAZy;7)

State	North Carolina
Name	Yadkin Formation
Geologic age	Cambrian/Late Proterozoic
Original map label	CZy
Primary rock type	metasedimentary rock
Secondary rock type	mafic metavolcanic rock
Other rock types	intermediate metavolcanic rock
Lithologic constituents	Major Metamorphic > Metasedimentarymetamorphosed graywacke, volcanic sandstone, and siltstone Minor Metamorphic > Metaigneous > Metavolcanicinterbedded with mafic and intermediate metavolcanic flows and tuffs.
Map references	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, 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.
Unit 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, 1:500,000-scale, compiled by Brown, Philip M., et al, and Parker, John M. III, and in association with the State Geologic Map Advisory Committee. 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, 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.
Geographic coverage	Cabarrus - Montgomery - Stanly