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Map showing publication footprint
  • Usage in publication:
    • Orange Mountain Basalt
  • Modifications:
    • Named
  • Dominant lithology:
    • Basalt
    • Volcaniclastics
  • 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:

Basalt flows and interbedded volcaniclastic rocks at Orange Mountain, (First Watchung Mountain) NJ, are here named the Orange Mountain Basalt of the Newark Supergroup. This unit was the First Watchung basalt of Darton (1890), which is here abandoned. It overlies the Passaic Formation and underlies the Feltville Formation. The Jacksonwald Basalt of Wherry (1910), near the southern end of the Newark basin in PA, and the Oldwick, Sand Brook, and Ladentown Syncline outliers, correlate with and may be remnants of the Orange Mountain Basalt. Age is Early Jurassic.

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


Map showing publication footprint
  • Usage in publication:
    • Orange Mountain 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 Orange Mountain Basalt is Hettangian based on radiometric ages.

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


Map showing publication footprint
  • Usage in publication:
    • Orange Mountain 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 Orange Mountain Basalt of Olsen (1980) is here accepted for use by the U.S. Geological Survey and is assigned to the revised Brunswick Group in NJ and NY. It comprises at least two tholeiitic, pillowed pahoehoe and columnar basalt flows with interbedded volcaniclastic rocks. It is equivalent to the Jacksonwald Basalt in Pennsylvania, and may be part of the same flow.

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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