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Map showing publication footprint
  • Usage in publication:
    • Hook Mountain Basalt
  • Modifications:
    • Named
  • Dominant lithology:
    • Basalt
  • AAPG geologic province:
    • Piedmont-Blue Ridge 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:

The uppermost extrusive volcanic unit in the Watchung syncline is here named the Hook Mountain Basalt of the Newark Supergroup. This unit was the Third Watchung Basalt of Darton (1890). It overlies the Towaco Formation and underlies the Boonton Formation. Thickness is 110 m. Age is Early Jurassic.

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


Map showing publication footprint
  • Usage in publication:
    • Hook Mountain Basalt
  • Modifications:
    • Geochronologic dating
    • Age modified
  • AAPG geologic province:
    • Piedmont-Blue Ridge 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 Hook Mountain Basalt is Hettangian based on radiometric ages.

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


Map showing publication footprint
  • Usage in publication:
    • Hook Mountain Basalt*
  • Modifications:
    • Revised
  • AAPG geologic province:
    • Piedmont-Blue Ridge 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 Hook Mountain Basalt of Olsen (1980) is here adopted by the U.S. Geological Survey and is assigned to the revised Brunswick Group in NJ. Age is Early Jurassic.

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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