U.S. Geological Survey Home AASG Logo USGS HOME CONTACT USGS SEARCH USGS
National Geologic Map Database
Geologic Unit: Beluga
Search archives
Map showing publication footprint
  • Usage in publication:
    • Beluga Formation
  • Modifications:
    • Named
  • Dominant lithology:
    • Claystone
    • Sandstone
  • AAPG geologic province:
    • Alaska Southern region
Publication:

Calderwood, K.W., and Fackler, W.C., 1972, Proposed stratigraphic nomenclature for Kenai Group: American Association of Petroleum Geologists Bulletin, v. 56, no. 4, p. 739-754. [Available online, with subscription, from AAPG archives: http://www.aapg.org/datasystems or http://search.datapages.com]


Summary:

Beluga Formation of Kenai Group. Name proposed for 2nd from uppermost formation (of 5) of Kenai Group. Consists of thin intercalated beds of claystone, sandstone, siltstone and lignitic to subbituminous coal. Thickness 1,300 m. Unconformably overlies Tyonek Formation. Unconformably underlies Sterling Formation (new). Age is Tertiary.
Type section (subsurface): Standard Oil of California Beluga River No.1 well (212-35), in SW/4 NW/4 sec. 35, T. 13 N., R. 10 W., Seward Meridian, Cook Inlet, AK.

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


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

Magoon, L.B., Adkison, W.L., and Egbert, R.M., 1976, Map showing geology, wildcat wells, Tertiary plant fossil localities, K/Ar age dates, and petroleum operations, Cook Inlet area, Alaska: U.S. Geological Survey Miscellaneous Investigations Series Map, I-1019, 1 sheet, scale 1:250,000


Summary:

Age is late Miocene based on Homerian and Clamgulchian flora from Beluga Formation.

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


Map showing publication footprint
  • Usage in publication:
    • Beluga Formation*
  • Modifications:
    • Geochronologic dating
  • AAPG geologic province:
    • Alaska Southern region
Publication:

Turner, D.L., Triplehorn, D.M., Naeser, C.W., and Wolfe, J.A., 1980, Radiometric dating of ash partings in Alaskan coal beds and upper Tertiary paleobotanical stages: Geological Society of America, Geology, v. 8, no. 2, p. 92-96.


Summary:

Homerian type section K-Ar age samples on plagioclase range from 11.3 +/-0.7 to 8.8 +/-0.9 Ma; zircon fission-track ages range from 8.8 +/-1.0 to 8.1 +/-1.0 Ma. Samples are from southwestern shore of Kachemak Bay from Beluga Formation.

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


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

Wolfe, J.A., and Tania, T., 1980, The Miocene Seldovia Point flora from the Kenai Group, Alaska: U.S. Geological Survey Professional Paper, 1105, 52 p.


Summary:

Age is late middle and late Miocene based on Homerian and lower Clamgulchian Stages of fossil flora within unit.

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


Search archives

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 ([ ]).

Accessibility FOIA Privacy Policies and Notices

USA Gov U.S. Department of the Interior | U.S. Geological Survey
Supported by the National Cooperative Geologic Mapping Program
Page Contact Information: Personnel
Page Last Modified: Thu 04 Apr 2024 03:37:21 PM MDT