Metamorphosed mafic to felsic flow, and volcaniclastic and hypabyssal intrusive rocks

Includes some diorite and gabbro north and northwest of Boston.
State Massachusetts
Name Metamorphosed mafic to felsic flow, and volcaniclastic and hypabyssal intrusive rocks
Geologic age Proterozoic Z
Lithologic constituents
Major
Metamorphic > Metaigneous > Metavolcanicmetamorphosed mafic to felsic flow
Minor
Igneous > Volcanic (Volcaniclastic-volcanic breccia)
Igneous > Plutonic > Gabbroic > Gabbro
Igneous > Hypabyssalhypabyssal intrusive rocks
Igneous > Plutonic > Dioritic > Diorite
Comments Part of Milford-Dedham Zone (Tertiary and Older Rocks)
References
NGMDB product
Counties Bristol - Essex - Middlesex - Plymouth - Worcester