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Felsic and intermediate gneiss

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Medium grained, light pink to greenish gray; largely quartz, feldspar, and mica; commonly gneissic, containing alteration minerals; interfingers with gabbroic gneiss.
State Pennsylvania
Name Felsic and intermediate gneiss
Geologic age Precambrian
Lithologic constituents
Major
Metamorphic > Gneiss > Muscovite-gneissfelsic and intermediate gneiss - medium grained, light pink to greenish gray; largely quartz, feldspar, and mica; commonly gneissic, containing alteration minerals; interfingers with gabbroic gneiss
Comments Digital map differences from 1980 printed map: name changed from (Granodiorite and granodiorite gneiss).
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, Miles, C.E., and Whitfield, T.G., compilers, 2001, Bedrock Geology of Pennsylvania, edition: 1.0, digital map, scale 1:250,000.
NGMDB product
Counties Berks - Chester - Lancaster