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Collinsville Formation

Collinsville Formation - Brown to rusty-brown schist containing coticule and locally massive amphibolite at base.
StateMassachusetts
NameCollinsville Formation
Geologic ageMiddle Ordovician or older
Original map labelOcoc
CommentsPart of Bronson Hill Zone (Ordovician and Older Rocks)
Primary rock typeschist
Secondary rock typeamphibolite
Other rock types
Lithologic constituents
Major
Metamorphic > Schistbrown to rusty-brown schist containing coticule
Metamorphic > Amphibolite
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Unpublished Digital Geologic Map of Massachusetts received from Rudi Hon at Boston College in 1998.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.

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URL: http://mrdata.usgs.gov/geology/state/sgmc-unit.php?unit=MAOcoc;0
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