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Hoosac Formation

Hoosac Formation - Undifferentiated Hoosac Formation.
StateMassachusetts
NameHoosac Formation
Geologic ageLower Cambrian and Proterozoic Z
Original map labelEZh
CommentsPart of Taconic-Berkshire Zone (Ordovician and Older Rocks); east of Berkshire Highlands
Primary rock typeschist
Secondary rock typephyllite
Other rock typesgneiss; amphibolite; quartzite; granofels; calc-silicate rock
Lithologic constituents
Major
Metamorphic > Schistmostly albite schist; some mica schist
Incidental
Metamorphic > Metasedimentary > Calc-silicate-rockcalc-silicate rocks
Metamorphic > Amphibolite
Metamorphic > Granoblastic > Granofels
Metamorphic > Metasedimentary > Metaclastic > Quartzite
Metamorphic > Metasedimentary > Metaclastic > Phyllite
Metamorphic > Gneiss
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Unpublished Digital Geologic Map of Massachusetts received from Rudi Hon at Boston College in 1998.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 - Franklin - Hampden - Hampshire

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