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Alligator Back Formation; Gneiss

Gneiss - finely laminated to thin layered; locally contains massive gneiss and micaceous granule conglomerate; includes schist, phyllite, and amphibolite.
State North Carolina
Name Alligator Back Formation; Gneiss
Geologic age Late Proterozoic
Primary rock type gneiss
Secondary rock type conglomerate
Other rock types schist; phyllite; amphibolite
Lithologic constituents
Major
Metamorphic > Gneissfinely laminated to thin layered
Minor
Metamorphic > Amphibolite
Metamorphic > Schist
Sedimentary > Clastic > Conglomeratelocally contains massive gneiss and micaceous granule conglomerate
Metamorphic > Metasedimentary > Metaclastic > Phyllite
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.
Counties Avery - Burke - Caldwell - McDowell - Mitchell - Watauga - Yancey