Cobble Mountain Formation

Rusty-weathering mica schist; thin (15 cm or less) beds of gneiss.
State Massachusetts
Name Cobble Mountain Formation
Geologic age Middle Ordovician
Lithologic constituents
Major
Metamorphic > Schist > Mica-schistRusty-weathering mica schist.
Minor
Metamorphic > Gneissthin (15 cm or less) beds of gneiss
Comments Part of Rowe-Hawley Zone (Ordovician and Older Rocks)
References
NGMDB product
Counties Hampden