Collinsville Formation

Rusty-weathering, massive granofels containing anthophyllite and tourmaline; some rusty-stained gneiss.
State Massachusetts
Name Collinsville Formation
Geologic age Middle Ordovician or older
Lithologic constituents
Major
Metamorphic > Granoblastic > Granofelsrusty-weathering, massive granofels containing anthophyllite and tourmaline
Minor
Metamorphic > Gneisssome rusty-stained gneiss
Comments Part of Bronson Hill Zone (Ordovician and Older Rocks)
References
NGMDB product
Counties Franklin