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  • Usage in publication:
    • Ugnuravik Group
  • Modifications:
    • Named
    • Biostratigraphic dating
  • Dominant lithology:
    • Shale
    • Sandstone
    • Siltstone
    • Mudstone
  • AAPG geologic province:
    • Alaska Northern region
Publication:

Carman, G.J., and Hardwick, Peter, 1983, Geology and regional setting of Kuparuk oil field, Alaska: American Association of Petroleum Geologists Bulletin, v. 67, no. 6, p. 1014-1031. [Available online, with subscription, from AAPG archives: http://www.aapg.org/datasystems or http://search.datapages.com]


Summary:

Named after Ugnuravik River. Type section designated as interval (6793 to 5580 ft) in Ugnu State No.1 well, Kuparuk oil field, northernmost edge of Alaskan North Slope. Includes (ascending); Miluveach Formation (new), Kuparuk Formation (new), Kalubik Formation (new), and HRZ unit. Is mappable over more than 600 sq mi in Colville-Prudhoe basin where thickness is over 1500 ft. Contains shale, sandstone, siltstone, and mudstone. Overlies Kingak Shale Formation of Jurassic age. Underlies Colville Group of Late Cretaceous age. Palynological studies suggest early Valanginian to Albian (Early Cretaceous) Age for group.

Source: GNU records (USGS DDS-6; Menlo 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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