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Collinsville Formation

Collinsville Formation - Interlayered amphibolite and felsic gneiss in beds less than 1 m thick. Local, coarse-grained magnetite-hornblende gneiss.
StateMassachusetts
NameCollinsville Formation
Geologic ageMiddle Ordovician or older
Original map labelOcoa2
CommentsPart of Bronson Hill Zone (Ordovician and Older Rocks)
Primary rock typeamphibolite
Secondary rock typefelsic gneiss
Other rock typesmafic gneiss
Lithologic constituents
Major
Metamorphic > GneissInterlayered amphibolite and felsic gneiss in beds less than 1 m thick; local, coarse-grained magnetite-hornblende gneiss.
Metamorphic > AmphiboliteInterlayered amphibolite and felsic gneiss in beds less than 1 m thick.
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Unpublished Digital Geologic Map of Massachusetts received from Rudi Hon at Boston College in 1998.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 coverageFranklin

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