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Collinsville Formation

Collinsville Formation - Amphibolite and minor plagioclase gneiss. Magnetite-hornblende granofels near top.
StateMassachusetts
NameCollinsville Formation
Geologic ageMiddle Ordovician or older
Original map labelOcoa
CommentsPart of Bronson Hill Zone (Ordovician and Older Rocks)
Primary rock typeamphibolite
Secondary rock typegneiss
Other rock typesgranofels
Lithologic constituents
Major
Metamorphic > Amphibolite
Minor
Metamorphic > Gneissplagioclase gneiss
Incidental
Metamorphic > Granoblastic > Granofelsmagnetite-hornblende granofels
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Unpublished Digital Geologic Map of Massachusetts received from Rudi Hon at Boston College in 1998.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 coverageHampden

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