|Name||Fordham Gneiss (C and D member)|
|Geologic age||Precambrian - Middle Proterozoic|
Metamorphic > Gneissbiotite-hornblende-quartz-plagioclase gneiss, biotite and/or hornblende-quartz-feldspar gneiss, sillimanite-garnet schistose gneiss
Metamorphic > Amphibolite
Metamorphic > Metasedimentary > Metaclastic > Quartzite
|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).|
Fisher, D.W., Isachsen, Y.W., and Rickard, L.V., 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 1:250,000.
USGS Geologic Names lexicon found at: http://ngmdb.usgs.gov/Geolex/