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Amphibolite

Amphibolite - pyroxenic amphibolite, hornblende gneiss, commonly biotitic, garnetiferous; subordinate calcsilicate rock.
StateNew York
NameAmphibolite
Geologic ageMiddle Proterozoic
Original map labelam
Primary rock typeamphibolite
Secondary rock typemafic gneiss
Other rock typescalc-silicate rock
Lithologic constituents
Major
Metamorphic > Amphiboliteamphibolite, pyroxenic amphibolite
Minor
Metamorphic > Gneisshornblende gneiss, commonly biotitic, garnetiferous
Incidental
Metamorphic > Metasedimentary > Calc-silicate-rocksubordinate calcsilicate rock
Map references
NYS Museum, NYS Geological Survey, NYS Museum Technology Center, 1999, 1:250,000 Bedrock geology of NYS, data is distributed in ARC/INFOr EXPORT format (with ".e00" extension) in 5 seperate files based on printed map sheets, http://www.nysm.nysed.gov/gis.html.
Unit references
D. W. Fisher; Y. W. Isachsen, L. V. Rickard, 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 1:250000.

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URL: http://mrdata.usgs.gov/geology/state/sgmc-unit.php?unit=NYYam;3
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