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Wissahickon Formation (Undivided)

Wissahickon Formation (Undivided) - Muscovite-chlorite-albite schist, muscovite-chlorite schist, chloritoid schist, and quartzite; intensely folded and cleaved.
StateMaryland
NameWissahickon Formation (Undivided)
Geologic ageLate Precambrian (?)
Original map labelwu
Primary rock typeschist
Secondary rock typequartzite
Other rock types
Lithologic constituents
Major
Metamorphic > Schist > Mica-schist > Muscovite-schist
Minor
Metamorphic > Metasedimentary > Metaclastic > Quartzite
Incidental
Metamorphic > Schistchloritoid schist
Map references
Cleaves, E.T., Edwards, J., Jr., Glaser, J.D., 1968, Geologic Map of Maryland: Maryland Geological Survey, Baltimore, Maryland, scale 1:250,000.
Unit references
Cleaves, E.T., Edwards, J., Jr., Glaser, J.D., 1968, Geologic Map of Maryland: Maryland Geological Survey, Baltimore, Maryland, scale 1:250,000.
Unpublished digital version of the Maryland state geologic map that was digitized by the USGS Water Resources Office in Towson, MD
Geographic coverageBaltimore - Carroll - Cecil - Harford - Howard - Montgomery

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URL: http://mrdata.usgs.gov/geology/state/sgmc-unit.php?unit=MDwu;3
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