State | Massachusetts |
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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 | |
NGMDB product | |
Counties | Berkshire |