Canaan Mountain Formation

Rusty-weathering, coarse garnet schist and feldspathic schist.
State Massachusetts
Name Canaan Mountain Formation
Geologic age Lower Ordovician and Proterozoic Z
Lithologic constituents
Major
Metamorphic > SchistRusty-weathering, coarse garnet schist and feldspathic schist.
Comments Part of Taconic-Berkshire Zone (Ordovician and Older Rocks); east of Berkshire Highlands. Shown as Canaan Mountain Formation of Proterozoic Z and Early Ordovician age. [GNU records indicate that this was a mistake and should have been shown as Proterozoic Z and Early Cambrian age.] per USGS Lexicon website (MA012).
References
NGMDB product
Counties Berkshire