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National Geologic Map Database
Geologic Unit: Etivluk
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Map showing publication footprint
  • Usage in publication:
    • Etivluk Group*
  • Modifications:
    • Named
    • Biostratigraphic dating
  • Dominant lithology:
    • Chert
    • Shale
    • Limestone
  • 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 Etivluk River, tributary of Colville River, western Endicott Mountains, northern AK. Type locality designated as composite of type locality of Siksikpuk Formation (secs.21 and 23 T12S R1E) and type section of Otuk Formation (sec.31 T10S R16W, Killik River quad). Consists of (ascending): Siksikpuk Formation and Otuk Formation (new) which includes Blankenship Member (new). Group consists characteristically of thin-bedded chert, shale, silicified shale, and silicified limestone. In Endicott Mountains and in some places in DeLong Mountains, Etivluk Group appears to disconformably overlie Lisburne Group; elsewhere contact may be gradational. Disconformably underlies bed of shale, graywacke and conglomerate of Early Cretaceous age. Age of Siksikpuk is Pennsylvanian, Permian, and Early Triassic, and age of Otuk Formation ranges from late Early Triassic to early Middle Jurassic (both based on fossils, some of which are listed in report).

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


Map showing publication footprint
  • Usage in publication:
    • Etivluk Group
  • Modifications:
    • Revised
  • AAPG geologic province:
    • Alaska Northern region
Publication:

Mull, C.G., Crowder, R.K., Adams, K.E., Siok, J.P., Bodnar, D.A., Harris, E.E., Alexander, R.A., and Solie, D.N., 1987, Stratigraphy and structural setting of the Picnic Creek allochthon, Killik River quadrangle, central Brooks Range, Alaska; a summary, IN Tailleur, I.L., and Weimer, Paul, eds., Alaskan North Slope geology; Volume 2: Society of Economic Paleontologists and Mineralogists, Pacific Section, North Slope Seminar II, AAPG/SEPM/SEG Pacific Section annual meeting, Anchorage, AK, May 22-24, 1985, book 50, p. 649-662., Prepared by SEPM Pacific Section and Alaska Geol. Soc


Summary:

Includes newly named formation, Imnaitchiak Chert, in Picnic Creek allochthon, Killik River quad. Imnaitchiak Chert contains some rocks previously assigned to Siksikpuk Formation (of Etivluk Group).

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


Map showing publication footprint
  • Usage in publication:
    • Etivluk Group*
  • Modifications:
    • Revised
    • Age modified
  • AAPG geologic province:
    • Alaska Northern region
Publication:

Moore, T.E., Wallace, W.K., Bird, K.J., Karl, S.M., Mull, C.G., and Dillon, J.T., 1994, Geology of northern Alaska, Chapter 3, IN Plafker, George, and Berg, H.C., eds., Geology of Alaska: Geological Society of America, The Geology of North America, The Decade of North American Geology (DNAG), v. G-1, p. 49-140.


Summary:

Etivluk Group revised to adopt and include Imnaitchiak Chert of Mull and others (1987). Age of group now is Early Pennsylvanian, Permian, Triassic, and Early and Middle Jurassic in part based on age for Imnaitchiak Chert.

Source: GNU records (USGS DDS-6; Menlo 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.

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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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