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 |