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Mafic gneiss

Mafic gneiss - Dark, medium grained; includes rocks of probable sedimentary origin; may be equivalent to "PZmgh" in places.
StatePennsylvania
NameMafic gneiss
Geologic agePrecambrian
Original map labelmgh
CommentsDigital map differences from 1980 printed map: name changed from (Mafic gneiss, hornblende-bearing).
Primary rock typemafic gneiss
Secondary rock typeparagneiss
Other rock types
Lithologic constituents
Major
Metamorphic > Gneissmafic gneiss - dark, medium grained; includes rocks of probable sedimentary origin; may be equivalent to "PZmgh" in places.
Minor
Metamorphic > Metasedimentary > Paragneissincludes rocks of probable sedimentary origin; may be equivalent to "PZmgh" in places.
Map references
Pennsylvania Bureau of Topographic and Geologic Survey, Department of Conservation and Natural Resources, 2001, Bedrock Geology of Pennsylvania, edition: 1.0, digital map. Retrieved from internet 9-30-2004; <http://www.dcnr.state.pa.us/topogeo/map1/bedmap.aspx> DL Data: pageoexp.zip
Unit references
Berg, T. M., Edmunds, W. E., Geyer, A. R., and others, compilers, 1980, Geologic map of Pennsylvania: Pennsylvania Geological Survey, 4th ser., Map 1, 2nd ed., 3 sheets, scale 1:250,000.
Pennsylvania Bureau of Topographic and Geologic Survey, Department of Conservation and Natural Resources, 2001, Bedrock Geology of Pennsylvania, edition: 1.0, digital map. Retrieved from internet 9-30-2004; <http://www.dcnr.state.pa.us/topogeo/map1/bedmap.aspx> DL Data: pageoexp.zip
Geographic coverageBucks - Chester - Delaware - Montgomery - Philadelphia

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URL: http://mrdata.usgs.gov/geology/state/sgmc-unit.php?unit=PApCAmgh;14
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