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National Geologic Map Database
Geologic Unit: Ignek
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Map showing publication footprint
  • Usage in publication:
    • Ignek formation*
  • Modifications:
    • Named
  • Dominant lithology:
    • Shale
    • Sandstone
    • Coal
    • Redbeds
  • AAPG geologic province:
    • Alaska Northern region
Publication:

Leffingwell, E. de K., 1919, The Canning River region, northern Alaska: U.S. Geological Survey Professional Paper, 109, 251 p., (incl. geologic map, scale 1:250,000)


Summary:

Type locality is on south side of Red Hill in Ignek Valley at west end of Sadlerochit Mountains, Canning River region, northeastern AK. Occurs at both ends of Sadlerochit Mountains and probably along north front, but not identified elsewhere. Consists of black shale and subordinate sandstone, coal or red beds. Thickness is about 2500 ft. Is youngest Mesozoic formation in region. Fauna differs from that of Kingak shale (new). Is tentatively assigned to Jurassic(?) age.

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


Map showing publication footprint
  • Usage in publication:
    • Ignek formation*
  • Modifications:
    • Age modified
  • AAPG geologic province:
    • Alaska Northern region
Publication:

Payne, T.G., Dana, S.W., Fischer, W.A., Gryc, George, Lathram, E.H., Morris, R.H., Tappan, H.N., and Yuster, S.T., 1951, Geology of the Arctic slope of Alaska: U.S. Geological Survey Oil and Gas Investigations Map, OM-126, 1 sheet, scale 1:1,000,000


Summary:

Age on map legend given as Early and Late Cretaceous, but note says unit includes rocks of Jurassic age.

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


Map showing publication footprint
  • Usage in publication:
    • Ignek formation*
  • Modifications:
    • Age modified
  • AAPG geologic province:
    • Alaska Northern region
Publication:

Imlay, R.W., 1961, Characteristic Lower Cretaceous megafossils from northern Alaska: U.S. Geological Survey Professional Paper, 335, 74 p.


Summary:

Correlation chart shows lower member of Ignek formation in Canning valley as of Albian age (Early Cretaceous). [Jurassic(?) age thus removed from Ignek.]

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


Map showing publication footprint
  • Usage in publication:
    • Ignek Formation†
  • Modifications:
    • Abandoned
  • AAPG geologic province:
    • Alaska Northern region
Publication:

Detterman, R.L., Reiser, H.N., Brosge, W.P., and Dutro, J.T., Jr., 1975, Post-Carboniferous stratigraphy, northeastern Alaska: U.S. Geological Survey Professional Paper, 886, 46 p.


Summary:

Keller and others (1961) redefined Ignek (p.203) to include only those rocks that were lithologic equivalents of Nanushuk and Colville Groups and placed lowest Cretaceous beds in Okpikruak Formation which included basal Kemik Sandstone Member. Authors of this study consider sandstone along west side of Canning River near Shublik Springs to be Kemik Sandstone Member. Upper part of type section of Ignek Formation is now considered Seabee Formation and lower part of Kongakut Formation. Thus Ignek Formation is abandoned.

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.

"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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