Dalton Formation

Black to dark-gray carbonaceous quartz schist.
State Massachusetts
Name Dalton Formation
Geologic age Lower Cambrian and Proterozoic Z
Lithologic constituents
Major
Metamorphic > Schistcarbonaceous quartz schist
Comments Part of Taconic-Berkshire Zone (Ordovician and Older Rocks)
References
NGMDB product
Counties Berkshire