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Tectonic breccia

Tectonic breccia - Consisting of completely mixed phyllites of Walloomsac Formation Taconic allochthon.
StateMassachusetts
NameTectonic breccia
Geologic ageOrdovician
Original map labelOtb
CommentsPart of Taconic-Berkshire Zone (Ordovician and Older Rocks)
Primary rock typetectonic breccia
Secondary rock typephyllite
Other rock types
Lithologic constituents
Major
Metamorphic > Metasedimentary > Metaclastic > PhylliteConsisting of completely mixed phyllites of Walloomsac Formation Taconic allochthon.
Tectonite > CataclasiteConsisting of completely mixed phyllites of Walloomsac Formation Taconic allochthon.
Map references
Unpublished Digital Geologic Map of Massachusetts received from Rudi Hon at Boston College in 1998.
Unit 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., Wones, D.R., 1983, Bedrock Geologic Map of Massachusetts: U.S. Geological Survey, Reston, VA, scale 1: 250,000.
Geographic coverageBerkshire

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