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Tadmuck Brook Schist

Tadmuck Brook Schist - Andalusite phyllite and sillimanite schist, partly sulfidic; local quartzite in upper part.
StateMassachusetts
NameTadmuck Brook Schist
Geologic ageSilurian?, Ordovician, or Proterozoic Z
Original map labelSZtb
CommentsPart of Nashoba Zone (Silurian and Older Rocks)
Primary rock typephyllite
Secondary rock typeschist
Other rock typesquartzite
Lithologic constituents
Major
Metamorphic > Schistandalusite phyllite and sillimanite schist, partly sulfidic
Metamorphic > Metasedimentary > Metaclastic > Phylliteandalusite phyllite and sillimanite schist, partly sulfidic
Minor
Metamorphic > Metasedimentary > Metaclastic > Quartzitelocal quartzite in upper part
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Unpublished Digital Geologic Map of Massachusetts received from Rudi Hon at Boston College in 1998.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 coverageMiddlesex - Worcester

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