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Cobble Mountain Formation

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Red rusty-weathering schist containing thin beds of white quartz-plagioclase granofels and vitreous quartzite. Local amphibolite and thin anthophyllite amphibolite.
State Massachusetts
Name Cobble Mountain Formation
Geologic age Middle Ordovician
Lithologic constituents
Major
Metamorphic > Schist
Minor
Metamorphic > Metasedimentary > Metaclastic > Quartzitevitreous quartzite
Metamorphic > AmphiboliteLocal amphibolite and thin anthophyllite amphibolite.
Metamorphic > Granoblastic > Granofelsquartz-plagioclase granofels
Comments Part of Rowe-Hawley Zone (Ordovician 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 Hampden