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Geologic Unit: Nanook
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Map showing publication footprint
  • Usage in publication:
    • Nanook Limestone*
  • Modifications:
    • Named
    • Biostratigraphic dating
  • Dominant lithology:
    • Limestone
    • Dolomite
  • AAPG geologic province:
    • Alaska Northern region
Publication:

Dutro, J.T., Jr., 1970, Pre-Carboniferous carbonate rocks, northeastern Alaska, IN Adkison, W.L., and Brosge, M.M., eds., Proceedings of the geological seminar on the North Slope of Alaska: American Association of Petroleum Geologists, Pacific Section, p. M1-M8., Prepared in conjunction with Northern California Geol. Soc. and USGS


Summary:

Named for Nanook Creek. Composite type section designated as exposures along south-flowing tributary to Nanook Creek on south flank of Shublik Mountains, secs.14 and 23 T2N R25E and sec.17 T2N R26E, Mount Michelson quad, northern AK. Crops out in Shublik and Sadlerochit Mountains. Consists of alternating light-gray limestone and medium-gray dolomite beds. Divided into 8 lithologic units. Redmarker unit in lowermost part contains orange weathering dolomite, stromatolites, and possible AMPHIPORA. Total thickness is about 3000 ft. Disconformably(?) overlies Katakturuk Dolomite (new). Unconformably underlies Kekiktuk Conglomerate. Age is Middle Devonian based on fossils in lower and upper parts of formation.

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


Map showing publication footprint
  • Usage in publication:
    • Nanook Limestone*
  • Modifications:
    • Age modified
    • Biostratigraphic dating
  • AAPG geologic province:
    • Alaska Northern region
Publication:

Blodgett, R.B., Clough, J.G., Dutro, J.T., Jr., Ormiston, A.R., Palmer, A.R., and Taylor, M.E., 1986, Age revisions for the Nanook Limestone and Katakturuk Dolomite, northeastern Brooks Range, IN Bartsch-Winkler, Susan, and Reed, K.M., eds., Geologic studies in Alaska by the U.S. Geological Survey during 1985: U.S. Geological Survey Circular, 978, p. 5-10.


Summary:

Age is Late Proterozoic or Early Cambrian to Early and (or) Middle Devonian based on presence of corals, stromatoporoids, brachiopods, trilobites, tentaculitids, and crinoid ossicles, as well as stratigraphic relations with correlative(?) units [elsewhere] in Yukon Territory and east-central AK.

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


Map showing publication footprint
  • Usage in publication:
    • Nanook Limestone*
  • Modifications:
    • Age modified
    • Biostratigraphic dating
  • AAPG geologic province:
    • Alaska Northern region
Publication:

Blodgett, R.B., Rohr, D.M., Harris, A.G., and Rong, Jia-yu, 1988, A major unconformity between Upper Ordovician and Lower Devonian strata in the Nanook Limestone, Shublik Mountains, northeastern Brooks Range, IN Galloway, J.P., and Hamilton, T.D., eds., Geologic studies in Alaska by the U.S. Geological Survey during 1987: U.S. Geological Survey Circular, 1016, p. 18-23.


Summary:

Age is Late Proterozoic or Early Cambrian, Ordovician, and Early Devonian based on revised faunal age assignments from unit.

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


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

Blodgett, R.B., Clough, J.G., Harris, A.G., and Robinson, M.S., 1992, The Mount Copleston Limestone, a new Lower Devonian formation in the Shublik Mountains, northeastern Brooks Range, Alaska, IN Bradley, D.C., and Ford, A.B., eds., Geologic studies in Alaska by the U.S. Geological Survey, 1990: U.S. Geological Survey Bulletin, 1999, p. 3-7.


Summary:

Nanook Limestone is stratigraphically restricted; Devonian strata of uppermost member [member 8 as defined by Dutro (1970)] are reassigned to (new) Mount Copleston Limestone based on stratigraphic, structural, and paleontologic criteria. Member 8 of the Nanook Limestone (Dutro, 1970) in the Sadlerochit Mountains further north are not so restricted. Age is Late Proterozoic or Early Cambrian and Early, Middle(?), and Late Ordovician accordingly.

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


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Asterisk (*) indicates published by U.S. Geological Survey authors.

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