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

Metamorphosed mafic to felsic flow, and volcaniclastic and hypabyssal intrusive rocks - Includes some diorite and gabbro north and northwest of Boston.
StateMassachusetts
NameMetamorphosed mafic to felsic flow, and volcaniclastic and hypabyssal intrusive rocks
Geologic ageProterozoic Z
Original map labelZv
CommentsPart of Milford-Dedham Zone (Tertiary and Older Rocks)
Primary rock typemetavolcanic rock
Secondary rock typemixed clastic/volcanic
Other rock typesdiorite; gabbro
Lithologic constituents
Major
Metamorphic > Metaigneous > Metavolcanicmetamorphosed mafic to felsic flow
Minor
Igneous > Plutonic > Gabbroic > Gabbro
Igneous > Plutonic > Dioritic > Diorite
Igneous > Volcanic (Volcaniclastic, volcanic breccia)
Igneous > Hypabyssalhypabyssal intrusive rocks
Map references
Unpublished Digital Geologic Map of Massachusetts received from Rudi Hon at Boston College in 1998.
Unit references
Zen, E-An (ed.), Goldsmith, R. (comp.), Ratcliffe, N.M. (comp.), Robinson, P. (comp.), Stanley, R.S. (comp.), Hatch, N.L., Jr., Shride, A.F., Weed, E.G.A., Wones, D.R., 1983, Bedrock Geologic Map of Massachusetts: U.S. Geological Survey, Reston, VA, scale 1: 250,000.
Geographic coverageBristol - Essex - Middlesex - Plymouth - Worcester

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