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Black and white, well-layered hornblende-biotite-plagioclase gneiss and amphibolite

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Contains irregular pods of diopside or cummingtonite-talc rock or amphibole calc-silicate, epidote-layered quartz-plagioclase gneiss near Hinsdale.
State Massachusetts
Name Black and white, well-layered hornblende-biotite-plagioclase gneiss and amphibolite
Geologic age Proterozoic Y
Lithologic constituents
Major
Metamorphic > Amphibolitehornblende-biotite-plagioclase gneiss and amphibolite
Metamorphic > Gneisshornblende-biotite-plagioclase gneiss and amphibolite; epidote-layered quartz-plagioclase gneiss near Hinsdale.
Comments Part of Taconic-Berkshire Zone (Ordovician and Older Rocks); in Berkshire Highlands and Green Mountain Core
References

Zen, E-An (ed.), Goldsmith, R. (comp.), Ratcliffe, N.M. (comp.), Robinson, P. (comp.), Stanley, R.S. (comp.), Hatch, N.L., Jr., Shride, A.F., Weed, E.G.A., and Wones, D.R., 1983, Bedrock Geologic Map of Massachusetts: U.S. Geological Survey, Reston, VA, scale 1: 250,000.

https://pubs.er.usgs.gov/publication/70046713
NGMDB product
Counties Berkshire