State | New York |
---|---|
Name | Fordham Gneiss, undivided |
Geologic age | Precambrian - Middle Proterozoic |
Lithologic constituents |
Major
Metamorphic > Gneissgarnet-biotite-quartz-plagioclase gneiss, sillimanite-garnet schistose gneiss, biotite-hornblende-quartz-plagioclase gneiss, biotite and/or hornblende-quartz-feldspar gneiss, biotite and/or hornblende-garnet-quartz-plagioclase gneiss, garnet-biotite-quartz-plagioclase gneiss, biotite-hornblende-quartz-plagioclase gneiss
Minor
Metamorphic > Granulite
Metamorphic > Metasedimentary > Metaclastic > Quartzite
Metamorphic > Amphibolite
|
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). |
References | 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/https://ngmdb.usgs.gov/Geolex/search |
NGMDB product | |
Counties | Bronx - New York - Queens - Westchester |