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Hoosac Schist

Hoosac Schist - Light- to medium-gray, rusty-weathering, fine- to medium-grained schist and poorly layered schistose gneiss, composed of quartz, biotite, plagioclase, muscovite, and generally garnet and sillimanite or kyanite.
State Connecticut
Name Hoosac Schist
Geologic age Cambrian?
Comments Part of Western Uplands; Proto-North American (Continental) Terrance - Displaced Iapetus Terrane In Vermont: Age of Hoosac is Late Proterozoic and Early Cambrian per CT004.
Primary rock type schist
Secondary rock type gneiss
Other rock types
Lithologic constituents
Major
Metamorphic > SchistLight- to medium-gray, rusty-weathering, fine- to medium-grained schist and poorly layered schistose gneiss, composed of quartz, biotite, plagioclase, muscovite, and generally garnet and sillimanite or kyanite.
Metamorphic > GneissLight- to medium-gray, rusty-weathering, fine- to medium-grained schist and poorly layered schistose gneiss, composed of quartz, biotite, plagioclase, muscovite, and generally garnet and sillimanite or kyanite.
Map references
Connecticut Geological and Natural History Survey, DEP, in cooperation with the U.S. Geological Survey, 2000, Bedrock Geology of Connecticut, data format: shapefile, file name: bedrock, downloaded from: http://magic.lib.uconn.edu/cgi-bin/MAGIC_DBsearch2.pl?Geography=37800&Loc=0000 on 9/18/2003, scale 1:50,000.
Unit references
Rodgers, John, compiler, 1985, Bedrock Geological Map of Connecticut: Connecticut Geological and Natural History Survey, Hartford, Connecticut, 2 sheets, scale 125,000.
Ratcliffe, N.M., 1993, Bedrock geologic map of the Mount Snow and Readsboro quadrangles, Bennington and Windham Counties, Vermont: U.S. Geological Survey Miscellaneous Investigations Series Map, I-2307, 9 p., 1 sheet, scale 1:24,000.
Counties Hartford - Litchfield