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Quinebaug Formation

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Amphibolite, biotite and hornblende gneiss, felsic gneiss, and calc-silicate gneiss.
State Massachusetts
Name Quinebaug Formation
Geologic age Ordovician, Cambrian, or Proterozoic Z
Lithologic constituents
Major
Metamorphic > Amphibolite
Metamorphic > Gneissbiotite and hornblende gneiss, felsic gneiss, and calc-silicate gneiss
Comments Part of Nashoba Zone (Silurian 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 Worcester