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Blackstone Group, Undivided

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Quartzite, schist, phyllite, marble, and metavolcanic rocks.
State Massachusetts
Name Blackstone Group, Undivided
Geologic age Proterozoic Z
Lithologic constituents
Major
Metamorphic > Metasedimentary > Metaclastic > Quartzite
Metamorphic > Schist
Metamorphic > Metasedimentary > Metaclastic > Phyllite
Minor
Metamorphic > Metasedimentary > Metacarbonate > Marble
Metamorphic > Metaigneous > Metavolcanic
Comments Part of Milford-Dedham Zone (Tertiary and Older Rocks)
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., and Wones, D.R., 1983, Bedrock Geologic Map of Massachusetts: U.S. Geological Survey, Reston, VA, scale 1: 250,000.

https://pubs.er.usgs.gov/publication/70046713
NGMDB product
Counties Middlesex - Norfolk - Worcester