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Geologic Unit: Gaikema
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Map showing publication footprint
  • Usage in publication:
    • Gaikema sandstone member*
  • Modifications:
    • Original reference
  • Dominant lithology:
    • Sandstone
    • Conglomerate
  • AAPG geologic province:
    • Alaska Southwestern region
Publication:

Kirschner, C.E., and Minard, D.L., 1948, Geology of the Iniskin Peninsula, Alaska: U.S. Geological Survey Oil and Gas Investigations Map, OM-95, 1 sheet, scale 1:4,800


Summary:

Gaikema sandstone member, upper member (of 2) of Kialagvik formation. Consists predominantly of resistant, cliff-forming sandstone beds 1 to 10 feet thick; usually separated by thin laminae of siltstone. Pebble lenses common and several conglomerate beds present. Thickest conglomerate bed approx. 50 feet.. Rocks are dark-green in fresh exposure and dark-brown in weathered exposures. Thickness ranges from 500 feet in southern part of outcrop area to about 970 feet in northern part. Overlies unnamed siltstone member of Kialagvik formation; underlies Tuxedni formation. Age is Early Jurassic (stated in map legend).
Well exposed on Gaikema Creek, in northern part of Iniskin Peninsula, southwestern AK. Named from Gaikema Creek. Name credited to Kellum and Wedow (report in preparation).

Source: US geologic names lexicon (USGS Bull. 1200, p. 1451); GNU records (USGS DDS-6; Menlo GNULEX).


Map showing publication footprint
  • Usage in publication:
    • Gaikema sandstone member*
  • Modifications:
    • Revised
    • Age modified
  • AAPG geologic province:
    • Alaska Southwestern region
Publication:

Imlay, R.W., 1953, Callovian (Jurassic) ammonites from the United States and Alaska; Part 2, Alaska Peninsula and Cook Inlet region: U.S. Geological Survey Professional Paper, 249-B, p. B41-B108.


Summary:

Table 5 facing p. 60. Gaikema sandstone member reassigned to Tuxedni formation. Lies between two unnamed siltstone members of Tuxedni. Age is Middle Jurassic (Bajocian). Revisions based on unpublished field work by R.W. Imlay and Don J. Miller. Study area Iniskin Peninsula, southwestern Alaska.
[GNC remark (ca. 1966, US geologic names lexicon, USGS Bull. 1200, p. 1451): USGS currently classifies the Gaikema Sandstone as a formation in Tuxedni Group on basis of a study now in progress.]

Source: US geologic names lexicon (USGS Bull. 1200, p. 1451); supplemental information from GNU records (USGS DDS-6; Menlo GNULEX).


Map showing publication footprint
  • Usage in publication:
    • Gaikema Sandstone*
  • Modifications:
    • Principal reference
    • Revised
  • AAPG geologic province:
    • Alaska Southwestern region
Publication:

Detterman, R.L., 1963, Revised stratigraphic nomenclature and age of the Tuxedni Group in the Cook Inlet region, Alaska, IN Geological Survey Research 1963: U.S. Geological Survey Professional Paper, 475-C, p. C30-C34.


Summary:

Gaikema Sandstone Member of Kirschner and Minard (1948) raised in rank to Gaikema Sandstone, second from lowermost formation (of 6) of Tuxedni Group. Section at type is 850 feet thick. Gradationally overlies Red Glacier Formation (new); conformably underlies Fitz Creek Siltstone (new), both of Tuxedni Group. Age is Middle Jurassic (Bajocian).
Type locality: on left bank of Gaikema Creek starting 5,000 ft from mouth and continuing 1,800 ft upstream, Iniskin Peninsula, southwestern AK.

Source: Modified from 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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