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Mineral Resources On-Line Spatial Data

Wissahickon Formation

Wissahickon Formation - Includes oligoclase-mica schist, some hornblende gneiss, some augen gneiss, and some quartz-rich and feldspar-rich members due to various degrees of granitization.
StatePennsylvania
NameWissahickon Formation
Geologic ageProbably lower Paleozoic
Original map labelXw
Primary rock typemica schist
Secondary rock typemafic gneiss
Other rock typesaugen gneiss; granitoid
Lithologic constituents
Major
Metamorphic > Schist > Mica-schistoligoclase-mica schist
Minor
Igneous > Plutonic > Graniticsome quartz-rich and feldspar-rich members due to various degrees of granitization.
Metamorphic > Gneiss > Hornblende-gneisssome hornblende gneiss, some augen gneiss
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 - Delaware - Montgomery - Philadelphia

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