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Boylston Schist

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Carbonaceous phyllite and schist, locally sulfidic; quartzite; calc-silicate beds.
State Massachusetts
Name Boylston Schist
Geologic age Silurian or Ordovician
Lithologic constituents
Major
Metamorphic > Metasedimentary > Metaclastic > Phyllitecarbonaceous phyllite and schist, locally sulfidic
Metamorphic > Schist > Calc-silicate-schistcarbonaceous phyllite and schist, locally sulfidic
Minor
Metamorphic > Metasedimentary > Metaclastic > Quartzite
Metamorphic > Metasedimentary > Calc-silicate-rock
Comments Part of Merrimack Belt (Silurian, Devonian and Pennsylvanian 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 Worcester