Mineral Resources On-Line Spatial Data
Mineral Resources > Online Spatial Data > Geology > by state > Connecticut
|Name||Beardsley Member [of Harrison (Prospect) Gneiss]|
|Geologic age||Middle? Ordovician|
|Original map label||Ohb|
|Comments||Part of Central Lowlands; Iapetus (Oceanic) Terrane - Connecticut Valley Synclinorium; Hartland Belt Secondary unit description per CT007.|
|Primary rock type||gneiss|
|Secondary rock type||schist|
|Other rock types||calc-silicate rock; marble|
Metamorphic > GneissMedium- to dark-gray, medium-grained, well-layered and lineated gneiss, composed of plagioclase, quartz, microcline, hornblende, biotite, and epidote. Microcline may occur as megacrysts 1 to 3 cm across.
Metamorphic > SchistMinor layers of garnetiferous schist.
Metamorphic > Metasedimentary > Calc-silicate-rockrarely calc-silicate rock
Metamorphic > Metasedimentary > Metacarbonate > Marblerarely marble
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.
Rodgers, John, compiler, 1985, Bedrock Geological Map of Connecticut: Connecticut Geological and Natural History Survey, Hartford, Connecticut, 2 sheets, scale 125,000.
|Geographic coverage||Fairfield - Hartford - New Haven|
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