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Allingtown Metavolcanics

Allingtown Metavolcanics - Green, fine-grained, massive greenstone, composed of epidote, actinolite, albite, and chlorite, commonly with abundant megacrysts of saussurite, interlayered with minor green phyllite, generally containing quartz and sericite. Dark amphibole in western outcrops.
StateConnecticut
NameAllingtown Metavolcanics
Geologic ageMiddle? Ordovician
Original map labelOa
CommentsPart of Central Lowlands; Iapetus (Oceanic) Terrane - Connecticut Valley Synclinorium; Orange-Milford Belt
Primary rock typegreenstone
Secondary rock typephyllite
Other rock types
Lithologic constituents
Major
Metamorphic > Metaigneous > GreenstoneGreen, fine-grained, massive greenstone, composed of epidote, actinolite, albite, and chlorite, commonly with abundant megacrysts of saussurite.
Minor
Metamorphic > Metasedimentary > Metaclastic > Phylliteinterlayered with minor green phyllite, generally containing quartz and sericite
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.
Geographic coverageNew Haven

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