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Geologic Unit: Bowser
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Map showing publication footprint
  • Usage in publication:
    • Bowser member*
  • Modifications:
    • Named
  • Dominant lithology:
    • Sandstone
    • Conglomerate
    • Siltstone
  • 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:

Named as middle named member (of 3) of Tuxedni formation. Is well exposed in valley of Bowser Creek and crops out over large area of Iniskin Peninsula, southwestern AK. Consists of thick-bedded to massive sandstone and conglomerate units interbedded with siltstone units. Is about 2600 ft thick. Overlies Cynthia Falls sandstone member; underlies Tonnie siltstone member (both of Tuxedni formation). Contains abundant specimens of INOCERAMUS and TRIGONIA. Age given as Middle Jurassic and may be in part Late(?) Jurassic age.

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


Map showing publication footprint
  • Usage in publication:
    • Bowser Formation*
  • Modifications:
    • Revised
    • Age modified
    • Biostratigraphic dating
  • 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:

Bowser Member (of Tuxedni Formation) of Kirschner and Minard (1948) is here restricted to upper part of member and raised in rank to Bowser Formation, uppermost formation (of 6) of Tuxedni Group. Type locality is designated on Tonnie Creek, starting 4500 ft S 47 deg E of Tonnie Peak, continuing upstream for 1500 ft, Iniskin Peninsula, southwestern AK. Ammonites from lower part have been identified by Imlay (1962) as of Bathonian or Callovian age, and from upper part as definitely Callovian. Therefore age is considered to be Middle(?) and Late Jurassic.

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


Map showing publication footprint
  • Usage in publication:
    • Bowser Formation*
  • Modifications:
    • Age modified
  • AAPG geologic province:
    • Alaska Southwestern region
Publication:

Imlay, R.W., and Detterman, R.L., 1973, Jurassic paleobiogeography of Alaska: U.S. Geological Survey Professional Paper, 801, 34 p. [Available online from the USGS PubsWarehouse: http://pubs.er.usgs.gov/pubs/pp/pp801]


Summary:

Correlation chart shows age of Bowser Formation to be Middle Jurassic (Bathonian and Callovian).

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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