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Hoosac Formation

Hoosac Formation - Green to gray-green chlorite-sericite-quartz phyllite; interbeds of chloritoid- or albite-rich schist and minor quartzite, locally rich in garnet and kyanite.
StateMassachusetts
NameHoosac Formation
Geologic ageLower Cambrian and Proterozoic Z
Original map labelEZhg
CommentsPart of Taconic-Berkshire Zone (Ordovician and Older Rocks); east of Berkshire Highlands
Primary rock typephyllite
Secondary rock typeschist
Other rock typesquartzite
Lithologic constituents
Major
Metamorphic > Schistinterbeds of chloritoid- or albite-rich schist; locally rich in garnet and kyanite
Metamorphic > Metasedimentary > Metaclastic > Phyllitegreen to gray-green chlorite-sericite-quartz phyllite; locally rich in garnet and kyanite
Minor
Metamorphic > Metasedimentary > Metaclastic > Quartzitelocally rich in garnet and kyanite
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Unpublished Digital Geologic Map of Massachusetts received from Rudi Hon at Boston College in 1998.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 - Hampshire

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