USGS - science for a changing world

Mineral Resources On-Line Spatial Data

Mineral Resources > Online Spatial Data > Geology > by state > Massachusetts

Gray, well-layered biotite-plagioclase-quartz gneiss

Gray, well-layered biotite-plagioclase-quartz gneiss - Containing beds of amphibolite, aluminous schist, quartzite, and calc-silicate gneiss.
StateMassachusetts
NameGray, well-layered biotite-plagioclase-quartz gneiss
Geologic ageProterozoic Y
Original map labelYb
CommentsPart of Taconic-Berkshire Zone (Ordovician and Older Rocks); in Berkshire Highlands and Green Mountain Core Units Yb and Ybu are described together on printed map; split into two descriptions here.
Primary rock typegranitic gneiss
Secondary rock typeamphibolite
Other rock typesschist; quartzite; gneiss
Lithologic constituents
Major
Metamorphic > Gneisswell-layered biotite-plagioclase-quartz gneiss; and calc-silicate gneiss
Minor
Metamorphic > Metasedimentary > Metaclastic > Quartzite
Metamorphic > Schistaluminous schist
Metamorphic > Amphibolite
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Unpublished Digital Geologic Map of Massachusetts received from Rudi Hon at Boston College in 1998.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 - Franklin - Hampden - Hampshire

Show this information as [XML]

AccessibilityFOIAPrivacyPolicies and Notices

Take Pride in America logoUSA.gov logoU.S. Department of the Interior | U.S. Geological Survey
URL: http://mrdata.usgs.gov/geology/state/sgmc-unit.php?unit=MAYb;0
Page Contact Information: Peter Schweitzer