Cobble Mountain Formation

Nonrusty-weathering silvery-gray schist, similar to schist in Ocb.
State Massachusetts
Name Cobble Mountain Formation
Geologic age Middle Ordovician
Lithologic constituents
Major
Metamorphic > Schistnonrusty-weathering silvery-gray schist
Comments Part of Rowe-Hawley Zone (Ordovician and Older Rocks)
References
NGMDB product
Counties Hampden