Hoosac Formation

Undifferentiated Hoosac Formation.
State Massachusetts
Name Hoosac Formation
Geologic age Lower Cambrian and Proterozoic Z
Lithologic constituents
Major
Metamorphic > Schist > Quartz-feldspar-schistmostly albite schist; some mica schist
Incidental
Metamorphic > Metasedimentary > Calc-silicate-rock
Metamorphic > Metasedimentary > Metaclastic > Phyllite
Metamorphic > Metasedimentary > Metaclastic > Quartzite
Metamorphic > Gneiss
Metamorphic > Amphibolite
Metamorphic > Granoblastic > Granofels
Comments Part of Taconic-Berkshire Zone (Ordovician and Older Rocks); east of Berkshire Highlands
References
NGMDB product
Counties Berkshire - Franklin - Hampden - Hampshire