State | Massachusetts |
---|---|
Name | Collinsville Formation |
Geologic age | Middle Ordovician or older |
Lithologic constituents | Major
Metamorphic > Schistbrown to rusty-brown schist containing coticule
Metamorphic > Amphibolite
|
Comments | Part of Bronson Hill Zone (Ordovician and Older Rocks) |
References | |
NGMDB product | |
Counties | Hampden |