Felsic to mafic gneiss (PApCAgn;14)

State	Pennsylvania
Name	Felsic to mafic gneiss
Geologic age	Precambrian
Original map label	gn
Comments	Digital map differences from 1980 printed map: name changed from (Granitic gneiss).
Primary rock type	felsic gneiss
Secondary rock type	mafic gneiss
Other rock types	orthogneiss
Lithologic constituents	Major Metamorphic > Gneissfelsic to mafic gneiss - light, medium grained; predominantly quartz and feldspar of igneous origin.
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 [http://www.dcnr.state.pa.us/topogeo/map1/bedmap.aspx]
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 [http://www.dcnr.state.pa.us/topogeo/map1/bedmap.aspx]
Geographic coverage	Berks - Bucks - Chester - Lancaster - Lebanon - Lehigh - Northampton