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Map showing publication footprint
  • Usage in publication:
    • Suntrana Formation*
  • Modifications:
    • Named
    • Biostratigraphic dating
  • Dominant lithology:
    • Sandstone
    • Clay
    • Coal
  • AAPG geologic province:
    • Alaska East-Central region
    • Alaska Southern region
Publication:

Wahrhaftig, Clyde, Wolfe, J.A., Leopold, E.B., and Lanphere, M.A., 1969, The coal-bearing group in the Nenana coal field, Alaska, IN Contributions to stratigraphy, 1968: U.S. Geological Survey Bulletin, 1274-D, p. D1-D30.


Summary:

Named for exposures on walls of Suntrana Creek, the type locality in SW/4 sec.23 T12S R7W, Healy D-4 quad, east-central AK. Widely exposed in Healy Creek and Lignite Creek coal basins of Nenana coal field. Consists of repeated sequences of coarse pebbly sandstone grading upward to fine-grained sandstone to clay and coal. Thickness ranges up to 1290 ft on Coal Creek on Healy Creek. Conformably overlies Sanctuary Formation (new); conformably underlies Lignite Creek Formation (new). Age is probably middle Miocene based on pollen and megafossil flora (Seldovian Stage).

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


Map showing publication footprint
  • Usage in publication:
    • Suntrana Formation*
  • Modifications:
    • Revised
  • AAPG geologic province:
    • Alaska East-Central region
    • Alaska Southern region
Publication:

Wahrhaftig, Clyde, 1987, The Cenozoic section at Suntrana, Alaska, IN Hill, M.L., ed., Cordilleran Section of the Geological Society of America, Centennial field guide: Geological Society of America, Cordilleran Section, The Decade of North American Geology (DNAG), Centennial Field Guide, v. 1, p. 445-450.


Summary:

Suntrana Formation assigned as 3rd from oldest formation (of 5) to Usibelli Group (new). Age remains middle Miocene based on plant fossils.

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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