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Nassau Formation

Nassau Formation - Gray to dark-greenish-gray, siliceous phyllite with abundant beds of quartzite, olive-gray metasiltstone and subgraywacke (includes Bomoseen Graywacke Member and Zion Hill quartzite Member).
StateMassachusetts
NameNassau Formation
Geologic ageLower Cambrian and Proterozoic Z
Original map labelEZn
CommentsPart of Taconic-Berkshire Zone (Ordovician and Older Rocks); in the Taconic Allochthon
Primary rock typephyllite
Secondary rock typequartzite
Other rock typesmeta-argillite; graywacke
Lithologic constituents
Major
Metamorphic > Metasedimentary > Metaclastic > PhylliteGray to dark-greenish-gray, siliceous phyllite.
Minor
Metamorphic > Metasedimentary > Metaclastic > Metasandstone > Metagraywackeolive-gray metasiltstone and subgraywacke
Metamorphic > Metasedimentary > Metaclastic > Quartzite
Metamorphic > Metasedimentary > Metaclastic > Metasiltstoneolive-gray metasiltstone and subgraywacke
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Unpublished Digital Geologic Map of Massachusetts received from Rudi Hon at Boston College in 1998.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

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