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Talcott Basalt

Talcott Basalt - Greenish-gray to black (weathers bright orange to brown), fine- to medium-grained, grading from basalt near contacts to fine-grained gabbro in the interior, composed of pyroxene and plagioclase with accessory opaques and locally olivine or devitrified glass. Pillows in many places; volcanic breccia with fragmentary pillows in others.
StateConnecticut
NameTalcott Basalt
Geologic ageLower Jurassic
Original map labelJta
CommentsPart of Central Lowlands; Newark Terrane - Hartford and Pomperaug Mesozoic Basins Part of Newark Supergroup (Upper Triassic and Lower Jurassic) Part of "Meriden Formation" of Krynine (1950) (Lower Jurassic); CT005.
Primary rock typebasalt
Secondary rock typegabbro
Other rock typesvolcanic breccia (agglomerate)
Lithologic constituents
Major
Igneous > Plutonic > Gabbroic > Gabbro (Flow, pillows)Greenish-gray to black (weathers bright orange to brown), fine- to medium-grained, grading from basalt near contacts to fine-grained gabbro in the interior, composed of pyroxene and plagioclase with accessory opaques and locally olivine or devitrified glass. Pillows in many places; volcanic breccia with fragmentary pillows in others.
Igneous > Volcanic > Mafic-volcanic > Basalt (Flow, pillows)Greenish-gray to black (weathers bright orange to brown), fine- to medium-grained, grading from basalt near contacts to fine-grained gabbro in the interior, composed of pyroxene and plagioclase with accessory opaques and locally olivine or devitrified glass. Pillows in many places; volcanic breccia with fragmentary pillows in others.
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.
Krynine, P.D., 1950, Petrology, stratigraphy, and origin of the Triassic sedimentary rocks of Connecticut: Conn. Geol. Nat. History Survey Bull. 73, 239 p.
Geographic coverageHartford - Litchfield - Middlesex - New Haven

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