State | Connecticut |
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Name | Dalton Formation |
Geologic age | Lower Cambrian and perhaps partly older |
Lithologic constituents | Major
Metamorphic > Metasedimentary > Metaclastic > Quartzitefeldspathic quartzite; layers of purer quartzite in many areas, especially near the top or where the formation is thin.
Metamorphic > GneissComposed of quartz, microcline, plagioclase, muscovite, biotite, and generally tourmaline; some schistose micaceous layers have sillimanite; commonly as quartz-sillimanite nodules rimmed with muscovite.
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Comments | Part of Western Uplands; Proto-North American (Continental) Terrane - Carbonate Shelf |
References | Rodgers, John, compiler, 1985, Bedrock Geological Map of Connecticut: Connecticut Geological and Natural History Survey, Hartford, Connecticut, 2 sheets, scale 1:125,000. |
NGMDB product | |
Counties | Fairfield - Litchfield |