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Geologic Unit: Onaga
Map showing publication footprint
  • Usage in publication:
    • Onaga shale*
  • Modifications:
    • Original reference
  • Dominant lithology:
    • Shale
    • Sandstone
    • Limestone
  • AAPG geologic province:
    • Nemaha anticline
Publication:

Moore, R.C., and Mudge, M.R., 1956, Reclassification of some Lower Permian and Upper Pennsylvanian strata in northern Midcontinent, IN Geological notes: American Association of Petroleum Geologists Bulletin, v. 40, no. 9, p. 2271-2278. [Available online, with subscription, from AAPG archives: http://www.aapg.org/datasystems or http://search.datapages.com]


Summary:

Pg. 2273, 2274 (fig. 1). Onaga shale of Admire group. Defined to include strata between Falls City limestone above and Wood Siding formation below. Thickness ranges from about 12 to 140 feet. Comprises (ascending) Towle shale, Aspinwall limestone, and Hawxby shale members. Age is Permian.
Type section: in east-west roadcut and ditch in SW/4 SW/4 sec. 2, T. 8 S., R. 10 E., Pottawatomie Co., northeastern KS. Named from town of Onaga in northern part of county.

Source: US geologic names lexicon (USGS Bull. 1200, p. 2827).


Map showing publication footprint
  • Usage in publication:
    • Onaga Shale*
  • Modifications:
    • Biostratigraphic dating
    • Areal extent
  • AAPG geologic province:
    • Chautauqua platform
    • Cherokee basin
    • Forest City basin
    • Nemaha anticline
Publication:

Boardman, D.R., II, Wardlaw, B.R., and Nestell, M.K., 2009, Stratigraphy and conodont biostratigraphy of the uppermost Carboniferous and Lower Permian from the North American Midcontinent: Kansas Geological Survey Bulletin, no. 255, 253 p.


Summary:

Onaga Shale of Admire Group. Includes (ascending) Towle Shale Member, Aspinwall Limestone Member, and Hawxby Shale Member. Overlies Wood Siding Formation; underlies Falls City Limestone of Admire Group. Interpreted to be nearshore marine deposits. Age is Late Pennsylvanian (late Gzhelian; STREPTOGNATHODUS BELLUS conodont zone).
Described from measured sections in Chautauqua, Greenwood, Pottawatomie, and Wabaunsee Counties, eastern Kansas, and Osage County, northern Oklahoma. (Locs. 1, 2, 3, A2, A12, A15, A20, A26.)

Source: Publication.


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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