Fordham Gneiss (C and D member) (NYZfc;3)

State	New York
Name	Fordham Gneiss (C and D member)
Geologic age	Precambrian - Middle Proterozoic
Original map label	fc
Comments	Age change per USGS Lexicon website (ref. NY046). Unit is divided up into 6 units on printed map (f undivided, and fa - fe). Digital map also separates them out, but combines unit fd with unit fc due to unclear labeling on printed map? (hard to distinguish).
Primary rock type	gneiss
Secondary rock type	amphibolite
Other rock types	quartzite
Lithologic constituents	Major Metamorphic > Gneissbiotite-hornblende-quartz-plagioclase gneiss, biotite and/or hornblende-quartz-feldspar gneiss, sillimanite-garnet schistose gneiss Minor Metamorphic > Metasedimentary > Metaclastic > Quartzite Metamorphic > Amphibolite
Map references	NYS Museum, NYS Geological Survey, NYS Museum Technology Center, 1999, 1:250,000 Bedrock geology of NYS, data is distributed in ARC/INFOr EXPORT format (with ".e00" extension) in 5 seperate files based on printed map sheets, http://www.nysm.nysed.gov/gis.html. [http://www.nysm.nysed.gov/gis.html.]
Unit references	D. W. Fisher; Y. W. Isachsen, L. V. Rickard, 1970, Geologic Map of New York State, consisting of 5 sheets: Niagara, Finger Lakes, Hudson-Mohawk, Adirondack, and Lower Hudson, New York State Museum and Science Service, Map and Chart Series No. 15, scale 1:250000. USGS Geologic Names Lexicon (GEOLEX) [http://ngmdb.usgs.gov/Geolex/]
Geographic coverage	Westchester