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Map showing publication footprint
  • Usage in publication:
    • Preakness Basalt
  • Modifications:
    • Named
  • Dominant lithology:
    • Basalt
  • AAPG geologic province:
    • Newark basin
Publication:

Olsen, P.E., 1980, The latest Triassic and Early Jurassic formations of the Newark basin (eastern North America, Newark Supergroup); stratigraphy, structure, and correlation: New Jersey Academy of Science, The Bulletin, v. 25, p. 25-51.


Summary:

Two or three thick basalt flows and interbedded volcaniclastic rocks at Preakness Mountain, NJ, are here named Preakness Basalt of the Newark Supergroup. This unit was the Second Watchung basalt of Darton (1890). It overlies the Feltville Formation and underlies the Towaco Formation. Thickness is 500 m near the type section. Age is Early Jurassic.

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


Map showing publication footprint
  • Usage in publication:
    • Preakness Basalt
  • Modifications:
    • Age modified
    • Geochronologic dating
  • AAPG geologic province:
    • Newark basin
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 Preakness Basalt is Hettangian based on radiometric ages.

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


Map showing publication footprint
  • Usage in publication:
    • Preakness Basalt*
  • Modifications:
    • Revised
  • AAPG geologic province:
    • Newark basin
Publication:

Lyttle, P.T., and Epstein, J.B., 1987, Bedrock geologic map of the Newark 2 degrees quadrangle, New York, New Jersey, and Pennsylvania: U.S. Geological Survey Miscellaneous Investigations Series Map, I-1715, 2 sheets, scale 1:250,000 [http://ngmdb.usgs.gov/Prodesc/proddesc_9892.htm]


Summary:

The Preakness Basalt of Olsen (1980) is here adopted by the USGS and is assigned to the revised Brunswick Group in NJ and NY.

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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