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National Geologic Map Database
Geologic Unit: Blankenship
Map showing publication footprint
  • Usage in publication:
    • Blankenship Member*
  • Modifications:
    • Named
    • Biostratigraphic dating
  • Dominant lithology:
    • Shale
    • Limestone
    • Chert
  • AAPG geologic province:
    • Alaska Northern region
Publication:

Mull, C.G., Tailleur, I.L., Mayfield, C.F., Ellersieck, Inyo, and Curtis, S.M., 1982, New upper Paleozoic and lower Mesozoic stratigraphic units, central and western Brooks Range, Alaska: American Association of Petroleum Geologists Bulletin, v. 66, no. 3, p. 348-362. [Available online, with subscription, from AAPG archives: http://www.aapg.org/datasystems or http://search.datapages.com]


Summary:

Named for exposures on Blankenship Creek as uppermost only named member (of 4) of Otuk Formation (new) of Etivluk Group (new). Type section located on cutbanks along small west-flowing tributary of Blankenship Creek, south side of Lisburne Ridge, NE/4 sec.36 T9S R21W, Howard Pass (1:250,000) quad, northern AK. Recognized as far east as gorge of Atigun River in Philip Smith Mountains quad (location of reference section). Principal reference section designated in SE/4 sec.31 T10S R16W (Killik River (1:250,000) quad. Consists of rhythmically interbedded black organic shale, minor dolomitic limestone and minor chert. Is 7 m thick. Contact with underlying portion of Otuk Formation appears to be gradational. Disconformably underlies rocks of Jurassic or Cretaceous age. Pelecypods and ammonites indicate age ranges from middle Early Jurassic through early Middle Jurassic.

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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