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  • Usage in publication:
    • Litchfield norite
  • Modifications:
    • Named
  • Dominant lithology:
    • Norite
    • Gabbro
  • AAPG geologic province:
    • New England province
Publication:

Gregory, H.E., 1906, The crystalline rocks, Chapter II, IN Rice, W.N., and Gregory, H.E., Manual of the geology of Connecticut: Connecticut Geological and Natural History Survey Bulletin, no. 6, p. 39-155.


Summary:

Litchfield norite is name used by Prof. Hobbs [unpublished] and in this report for certain dark gray rocks forming parts of Mount Prospect, near Litchfield, in western CT. Does not form large masses, but is associated with granodiorite, diorite, and amphibolite. Age not stated.

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


Map showing publication footprint
  • Usage in publication:
    • Litchfield mafic intrusives
  • Modifications:
    • Redescribed
  • AAPG geologic province:
    • New England province
Publication:

Rodgers, John, Gates, R.M., and Rosenfeld, J.L., 1956, Preliminary geological map of Connecticut: Connecticut Geological and Natural History Survey, See also "Explanatory text for preliminary geological map of Connecticut, 1956," Connecticut Geol. Nat. Hist. Survey Bull., no. 84, 64 p., 1959


Summary:

Rocks are mapped as informal Litchfield mafic intrusives. Redescribed to include medium- to coarse-grained mostly massive olivine norite, quartz norite, and hypersthene pyroxenite. Cut by dikes of several rock types from pyroxenite to granodiorite. Origin of name stated. Age given as pre-Triassic.

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


Map showing publication footprint
  • Usage in publication:
    • Litchfield Norite*
  • Modifications:
    • Age modified
  • AAPG geologic province:
    • New England province
Publication:

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


Summary:

Litchfield Norite mapped in the Connecticut Valley synclinorium of CT. Age shown as Middle(?) Ordovician.

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


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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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