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Washington Gneiss

Washington Gneiss - Rusty-weathering, muscovite-biotite-sillimanite and/or kyanite-garnet schist; blue-quartz ribbed conglomerate, interlayered garnet-plagioclase-quartz metadacite.
StateMassachusetts
NameWashington Gneiss
Geologic ageProterozoic Y
Original map labelYw
CommentsPart of Taconic-Berkshire Zone (Ordovician and Older Rocks); in Berkshire Highlands and Green Mountain Core
Primary rock typemica schist
Secondary rock typeconglomerate
Other rock typesfelsic metavolcanic rock
Lithologic constituents
Major
Metamorphic > Schist > Mica-schistmuscovite-biotite-sillimanite and/or kyanite-garnet schist
Minor
Metamorphic > Metaigneous > Metavolcanic > Metadaciteinterlayered garnet-plagioclase-quartz metadacite
Sedimentary > Clastic > Conglomerateblue-quartz ribbed conglomerate
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Unpublished Digital Geologic Map of Massachusetts received from Rudi Hon at Boston College in 1998.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 - Hampden - Hampshire

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