State | New Jersey |
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Name | Wissahickon Formation |
Geologic age | Lower Cambrian and Late Proterozoic |
Lithologic constituents |
Major
Metamorphic > Gneiss > Biotite-gneissFine- to medium-grained biotite-quartz-plagioclase gneiss
Metamorphic > Schist > Amphibole-schistFine- to medium-grained biotite-quartz-plagioclase schist
Minor
Metamorphic > Amphibolite
Incidental
Metamorphic > MigmatiteThe rocks are at high metamorphic grade, and, in places, the more pelitic parts have partly melted forming veins of migmatite.
|
Comments | Obducted rocks |
References | Dalton, R.F., Herman, G.C., Monteverde, D.H., Pristas, R.S., Sugarman, P.J., and Volkert, R.A., 1999, New Jersey Department of Environmental Protection, Bedrock Geology and Topographic Base Maps of New Jersey: New Jersey Geological Survey CD Series CD 00-1; ARC/INFO (v. 7.1), scale 1:100,000.Owens, James P., Sugarman, Peter J., Sohl, Norman F., Parker, Ronald A., Houghton, Hugh F., Volkert, Richard A., Drake, Avery A., Jr., and Orndorff, Randall C., 1998, Bedrock Geologic Map of Central and Southern New Jersey: U.S. Geological Survey Miscellaneous Investigations Series Map I-2540-B, 8 cross sections, 4 sheets, each size 58x41, scale 1:100,000.https://pubs.er.usgs.gov/publication/i2540B |
NGMDB product | |
Counties | Mercer |