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Geologic Unit: Kavik
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Map showing publication footprint
  • Usage in publication:
    • Kavik Member*
  • Modifications:
    • Named
    • Biostratigraphic dating
  • Dominant lithology:
    • Shale
    • Siltstone
  • 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:

Name proposed for lowermost member (of 3) of Ivishak Formation of Sadlerochit Group. Consists of thin-bedded, laminated, silty shale and siltstone with few interbedded sandstones. Is 278 feet thick at type. Disconformably to conformably overlies Ikiakpaurak Member (new) of Echooka Formation; conformably underlies Ledge Sandstone Member (new) of Ivishak Formation. Contains ammonite and pelecypod fauna of Early Triassic age (late Griesbachian) identified by N.J. Silberling. Microfossils collected from another area include older fossils according to Bergquist. "Age discrepancy cannot be resolved at present" p. 12.
Type locality: exposures on both flanks of small anticline, along Kavik River, between Lat. 69 deg. 17 min. and 69 deg. 18 min. N., Long. 146 deg. 52 min. W., northeastern AK.

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


Map showing publication footprint
  • Usage in publication:
    • Kavik Shale
  • Modifications:
    • Revised
    • Biostratigraphic dating
  • AAPG geologic province:
    • Alaska Northern region
Publication:

Jones, H.P., and Speers, R.G., 1976, Permo-Triassic reservoirs of Prudhoe Bay field, North Slope, Alaska, IN Braunstein, Jules, ed., North American oil and gas fields: American Association of Petroleum Geologists Memoir, 24, p. 23-50. [Available online, with subscription, from AAPG archives: http://www.aapg.org/datasystems or http://search.datapages.com]


Summary:

In subsurface Prudhoe Bay area Kavik Shale is middle formation (of 3) of Sadlerochit Group equivalent to Kavik Member of Ivishak Formation of Detterman and others (1975). Conformably overlies Echooka Formation or onlaps eroded surface of Lisburne Group. Is gradational with overlying Ivishak Sandstone [redefined]. Age is Late Permian and Early Triassic based on palynological data.

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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