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Geologic Unit: Healy Creek
Map showing publication footprint
  • Usage in publication:
    • Healy Creek Formation*
  • Modifications:
    • Named
    • Biostratigraphic dating
  • Dominant lithology:
    • Sandstone
    • Claystone
    • Conglomerate
    • Coal
  • AAPG geologic province:
    • Alaska East-Central 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 from Healy Creek. Type section designated as exposure on northeast wall of canyon of Healy Creek at Suntrana, SW/4 sec.4 T12S R7W, Healy D-4 quad, east-central AK. Reference section designated at east end of Healy Creek syncline about 6.5 mi east of type section. Is probably most widely distributed of coal-bearing group in Nenana coal field. Consists of interbedded poorly consolidated sandstone, conglomerate, claystone, and subbituminous coal. Thickness ranges from 800 to 1150 ft. Unconformably overlies pre-Tertiary rocks; conformably underlies Sanctuary Formation (new). Based on "lower Healy Creek" (or Rex Creek) flora and "upper Healy Creek" floral assemblages age is considered late(?) Oligocene to early Miocene, although type locality is early Miocene age only.

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


Map showing publication footprint
  • Usage in publication:
    • Healy Creek Formation*
  • Modifications:
    • Age modified
  • AAPG geologic province:
    • Alaska East-Central region
    • Alaska Southern region
Publication:

Wolfe, J.A., 1977, Paleogene floras from the Gulf of Alaska region: U.S. Geological Survey Professional Paper, 997, 108 p.


Summary:

Healy Creek Formation shown on correlation chart as Angoonian and early Seldovian plant Stages (late Oligocene and early Miocene age).

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


Map showing publication footprint
  • Usage in publication:
    • Healy Creek Formation*
  • Modifications:
    • Revised
    • Age modified
  • 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:

Healy Creek Formation assigned as lowermost formation (of 5) to Usibelli Group (new). At Suntrana age is early and middle Miocene. Therefore, overall age is late Oligocene to middle Miocene on basis of [reinterpreted age for] plant fossils.

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


Map showing publication footprint
  • Usage in publication:
    • Healy Creek Formation*
  • Modifications:
    • Age modified
  • AAPG geologic province:
    • Alaska East-Central region
    • Alaska Southern region
Publication:

Csejtey, Bela, Jr., Mullen, M.W., Cox, D.P., and Stricker, G.D., 1992, Geology and geochronology of the Healy quadrangle, south-central Alaska: U.S. Geological Survey Miscellaneous Investigations Series Map, I-1961, 2 sheets, 63 p., scale 1:250,000 and 1:360,000


Summary:

Unit age revised from late Oligocene to middle Miocene to: late Eocene and early and middle Miocene based on reinterpretation of ages of plant fossils [Rex Creek assemblage = late Eocene] and recognition of major hiatus within unit spanning entire Oligocene (and part of late Eocene) time. [see also Wolfe and Tanai (1986, Journal of Faculty of Science, Hokkaido University, ser.4 v.22 no.1)]

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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