|Geologic age||Lower Ordovician and Cambrian|
Metamorphic > AmphiboliteFine- to medium-grained, well-layered and foliated amphibolite; epidote-rich layers locally abundant.
|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|