|Geologic age||Lower Ordovician and Cambrian|
Metamorphic > SchistGray to black, fine-grained , slightly rusty, moderately carbonaceous schist; minor lenses of rock identical to OCAr.
Metamorphic > Metasedimentary > Metaclastic > Quartziteminor fine- to medium-grained dark-gray to white quartzite
|Comments||Part of Rowe-Hawley Zone (Ordovician and Older Rocks). Despite uncertainties, age of Rowe is probably only slightly, if at all, older than earliest Cambrian and almost certainly no younger than Early or possibly Middle Ordovician (Stanley and Hatch, 1988) per MA014.|
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.
Stanley, R.F. and Hatch, N.L., Jr., 1988, The pre-Silurian geology of the Rowe-Hawley zone, Chapter A, IN Hatch, N.L., Jr., ed., The bedrock geology of Massachusetts: U.S. Geological Survey Professional Paper, 1366-A, 39 p.
|Counties||Berkshire - Franklin - Hampden - Hampshire|