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Washington Gneiss

Washington Gneiss - Coarse- to medium-grained hornblende-garnet amphibolite, hornblende-plagioclase gneiss and phlogopite-hornblende-plagioclase amphibolite (metabasalt).
StateMassachusetts
NameWashington Gneiss
Geologic ageProterozoic Y
Original map labelYwhg
CommentsPart of Taconic-Berkshire Zone (Ordovician and Older Rocks); in Berkshire Highlands and Green Mountain Core
Primary rock typeamphibolite
Secondary rock typemafic gneiss
Other rock typesmeta-basalt
Lithologic constituents
Major
Metamorphic > AmphiboliteCoarse- to medium-grained hornblende-garnet amphibolite, and phlogopite-hornblende-plagioclase amphibolite (metabasalt).
Minor
Metamorphic > Metaigneous > Metavolcanic > Metabasaltphlogopite-hornblende-plagioclase amphibolite (metabasalt)
Metamorphic > Gneisshornblende-plagioclase 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Unpublished Digital Geologic Map of Massachusetts received from Rudi Hon at Boston College in 1998.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 - Hampden

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