Greylock Schist

Soft, lustrous green phyllite with minor beds of green quartzite and well laminated gray dolomitic phyllite; resembles Hoosac (CAZhg) and Nassau (CAZnp).
State Massachusetts
Name Greylock Schist
Geologic age Lower Cambrian and Proterozoic Z
Lithologic constituents
Major
Metamorphic > Metasedimentary > Metaclastic > PhylliteSoft, lustrous green phyllite with minor beds of well laminated gray dolomitic phyllite
Minor
Metamorphic > Metasedimentary > Metaclastic > Quartzite
Comments Part of Taconic-Berkshire Zone (Ordovician and Older Rocks); in the Taconic Allochthon
References
NGMDB product
Counties Berkshire