Rusty and gray biotite-quartz-feldspar gneiss

Rusty facies contains variable amounts of garnet, sillimanite, cordierite, graphite, sulfides; minor marble and calcsilicate rock.
State New York
Name Rusty and gray biotite-quartz-feldspar gneiss
Geologic age Middle Proterozoic
Lithologic constituents
Major
Metamorphic > Gneiss > Biotite-gneissrusty and gray biotite-quartz-feldspar gneiss
Incidental
Metamorphic > Metasedimentary > Calc-silicate-rock
Metamorphic > Metasedimentary > Metacarbonate > Marble
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 Orange - Putnam - Rockland - Westchester