Cobble Mountain Formation

Nonrusty-weathering coarse-grained aluminous schist.
State Massachusetts
Name Cobble Mountain Formation
Geologic age Middle Ordovician
Lithologic constituents
Major
Metamorphic > SchistNonrusty-weathering coarse-grained aluminous schist.
Comments Part of Rowe-Hawley Zone (Ordovician and Older Rocks)
References
NGMDB product
Counties Hampden