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Geologic Unit: Talcott
Map showing publication footprint
  • Usage in publication:
    • Talcott diabase*
  • Modifications:
    • Named
  • AAPG geologic province:
    • Hartford basin
    • New England province
Publication:

Emerson, B.K., 1898, Holyoke folio, Massachusetts-Connecticut: U.S. Geological Survey Geologic Atlas of the United States Folio, GF-50, 8 p., scale 1:125,000


Summary:

The Talcott Diabase is here named. It extends across CT, barely enters the southern edge of the Holyoke quad, but does not extend into MA.

Source: GNU records (USGS DDS-6; Reston GNULEX).


Map showing publication footprint
  • Usage in publication:
    • Talcott basalt
  • Modifications:
    • Revised
  • AAPG geologic province:
    • Hartford basin
    • New England province
Publication:

Lehmann, E.P., 1959, The bedrock geology of the Middletown quadrangle: Connecticut Geological and Natural History Survey Quadrangle Report, no. 8, 40 p.


Summary:

Talcott Basalt of the Newark Group is used in this area. Overlies New Haven Arkose; underlies Shuttle Meadow Formation. Age is Late Triassic.

Source: GNU records (USGS DDS-6; Reston GNULEX).


Map showing publication footprint
  • Usage in publication:
    • Talcott lava member
  • Modifications:
    • Revised
  • AAPG geologic province:
    • Hartford basin
    • New England province
Publication:

Rodgers, John, Gates, R.M., and Rosenfeld, J.L., 1959, Explanatory text for preliminary geological map of Connecticut, 1956: Connecticut Geological and Natural History Survey Bulletin, no. 84, 64 p.


Summary:

The Talcott is here mapped as the Talcott Lava Member of the Meriden Formation. Overlies New Haven Arkose; underlies the lower sedimentary member of the Meriden Formation. Age is Late Triassic.

Source: GNU records (USGS DDS-6; Reston GNULEX).


Map showing publication footprint
  • Usage in publication:
    • Talcott Formation
  • Modifications:
    • Revised
  • AAPG geologic province:
    • New England province
    • Hartford basin
Publication:

Sanders, J.E., 1968, Stratigraphy and primary sedimentary structures of fine-grained, well-bedded strata, inferred lake deposits, Upper Triassic, central and southern Connecticut, IN Klein, G.D., ed., Late Paleozoic and Mesozoic continental sedimentation in northeastern North America: Geological Society of America Special Paper, 106, p. 265-305.


Summary:

Talcott Formation of the Meriden Group is used because the flows contain interbedded sedimentary rocks.

Source: GNU records (USGS DDS-6; Reston GNULEX).


Map showing publication footprint
  • Usage in publication:
    • Talcott Formation
  • Modifications:
    • Revised
  • AAPG geologic province:
    • Hartford basin
    • New England province
Publication:

Sanders, J.E., 1970, Stratigraphy and structure of the Triassic strata of the Gaillard graben, south-central Connecticut: Connecticut Geological and Natural History Survey Guidebook, no. 3, 15 p.


Summary:

The Talcott Formation in the Gaillard graben [Hartford basin] consists of seven informal members including four basalt flows interbedded with three sedimentary units: basal basalt member, lower sedimentary member, lower massive basalt member, middle sedimentary member, pillowed and brecciated basalt member, upper sedimentary member, and upper basalt breccia member. Thickness is 560 to 1,800 ft (170 to 330 m).

Source: GNU records (USGS DDS-6; Reston GNULEX).


Map showing publication footprint
  • Usage in publication:
    • Talcott Basalt
  • Modifications:
    • Age modified
  • AAPG geologic province:
    • Hartford basin
    • New England province
Publication:

Olsen, P.E., 1984, Comparative paleolimnology of the Newark Supergroup; a study of ecosystem evolution: Yale University, Department of Geology Ph.D. thesis, 726 p.


Summary:

Age of the Talcott Basalt is early Hettangian based on sporomorph assemblages from the overlying Shuttle Meadow Formation.

Source: GNU records (USGS DDS-6; Reston GNULEX).


Map showing publication footprint
  • Usage in publication:
    • Talcott Basalt
  • Modifications:
    • Revised
  • AAPG geologic province:
    • Pomperaug basin
    • Hartford basin
    • New England province
Publication:

Rodgers, John, 1985, Bedrock geological map of Connecticut: Connecticut Geological and Natural History Survey, scale 1:125,000


Summary:

Talcott Basalt of the Newark Supergroup is mapped in the Hartford and Pomperaug basins.

Source: GNU records (USGS DDS-6; Reston GNULEX).


For more information, please contact Nancy Stamm, Geologic Names Committee Secretary.

Asterisk (*) indicates published by U.S. Geological Survey authors.

"No current usage" (†) implies that a name has been abandoned or has fallen into disuse. Former usage and, if known, replacement name given in parentheses ( ).

Slash (/) indicates name conflicts with nomenclatural guidelines (CSN, 1933; ACSN, 1961, 1970; NACSN, 1983, 2005, 2021). May be explained within brackets ([ ]).

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