Cobble Mountain Formation

Brown- or rusty-weathering thin-bedded feldspathic gneiss and mica schist.
State Massachusetts
Name Cobble Mountain Formation
Geologic age Middle Ordovician
Lithologic constituents
Major
Metamorphic > Schist > Mica-schist
Metamorphic > Gneissthin-bedded feldspathic gneiss
Comments Part of Rowe-Hawley Zone (Ordovician and Older Rocks)
References
NGMDB product
Counties Hampden