Biotite-quartz-plagioclase gneiss

With subordinate biotite granitic gneiss, amphibolite, calcsilicate rock.
State New York
Name Biotite-quartz-plagioclase gneiss
Geologic age Middle Proterozoic
Lithologic constituents
Major
Metamorphic > Gneiss > Biotite-gneissbiotite-quartz-plagioclase gneiss - with subordinate biotite granitic gneiss
Incidental
Metamorphic > Metasedimentary > Calc-silicate-rock
Metamorphic > Amphibolite
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.

NGMDB product
Counties Dutchess - Orange - Putnam - Rockland - Westchester