Mineral Resources On-Line Spatial Data
Mineral Resources > Online Spatial Data > Geology > by state > Massachusetts
|Geologic age||Lower Ordovician and Cambrian|
|Original map label||OEra|
|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.|
|Primary rock type||amphibolite|
|Secondary rock type|
|Other rock types|
Metamorphic > AmphiboliteFine- to medium-grained, well-layered and foliated amphibolite; epidote-rich layers locally abundant.
Unpublished Digital Geologic Map of Massachusetts received from Rudi Hon at Boston College in 1998.
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., Wones, D.R., 1983, Bedrock Geologic Map of Massachusetts: U.S. Geological Survey, Reston, VA, scale 1: 250,000.
|Geographic coverage||Berkshire - Franklin - Hampden - Hampshire|
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