|Name||Fordham Gneiss (A member)|
|Geologic age||Precambrian - Middle Proterozoic|
Metamorphic > Gneiss > Biotite-gneissgarnet-biotite-quartz-plagioclase gneiss, biotite-hornblende-quartz-plagioclase gneiss
Metamorphic > Amphibolite
Metamorphic > Granulite
|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/