Mineral Resources On-Line Spatial Data
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|Geologic age||Middle Ordovician|
|Original map label||Ow|
|Comments||Part of Taconic-Berkshire Zone (Ordovician and Older Rocks) Thin limestone unit near base of Walloomsac locally contains abundant bryozoan fragments, cup corals, pelmatozoan hash, and conodonts that indicate that the base of the Walloomsac is Rocklandian (middle and late Caradocian) or younger. Age of unit is Middle Ordovician per MA011.|
|Primary rock type||phyllite|
|Secondary rock type||schist|
|Other rock types||limestone|
Metamorphic > Schistgraphitic quartz phyllite and schist
Metamorphic > Metasedimentary > Metaclastic > Phyllitegraphitic quartz phyllite and schist
Sedimentary > Carbonate > Limestone (Lense)
Unpublished Digital Geologic Map of Massachusetts received from Rudi Hon at Boston College in 1998.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 - Hampden|
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