State | Massachusetts |
---|---|
Name | Cobble Mountain Formation |
Geologic age | Middle Ordovician |
Lithologic constituents |
Major
Metamorphic > Schist
Minor
Metamorphic > Metasedimentary > Metaclastic > Quartzitevitreous quartzite
Metamorphic > AmphiboliteLocal amphibolite and thin anthophyllite amphibolite.
Metamorphic > Granoblastic > Granofelsquartz-plagioclase granofels
|
Comments | Part of Rowe-Hawley Zone (Ordovician and Older Rocks) |
References | |
NGMDB product | |
Counties | Hampden |