National Geologic Map Database
Geologic Unit: Sac Fox
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Map showing publication footprint
  • Usage in publication:
    • Sac-Fox subgroup [informal]
  • Modifications:
    • Original reference
  • Dominant lithology:
    • Shale
    • Limestone
    • Coal
  • AAPG geologic province:
    • Forest City basin
    • Nemaha anticline

Condra, G.E., 1935, Geologic cross-section, Forest City, Missouri to south of Du Bois, Nebraska: Nebraska Geological Survey Paper, no. 8, 23 p., Issued late in 1935. See also USGS unpub. corr. charts of Pennsylvanian and Permian rocks of KS and NE, compiled by M.G. Wilmarth, Secretary of Committee on Geologic Names, Oct. 1936


Pg. 4, 5, 10-11. Sac-Fox subgroup [informal] of Wabaunsee group. Hereby named from Iowa-Sac-Fox Indian Reservation in southeastern Nebraska and northeastern Kansas. Thickness 174+ feet. Includes (descending): Scranton shale formation, 120 to 140+/- feet; Howard limestone formation, 7+/- feet; and Severy shale formation, 27 to 29 feet. Type locality in Missouri River blufflands, between mouth of Big Nemaha and Iowa Point, Kansas. Age is Pennsylvanian.
See also "Modern classifications of the Pennsylvanian rocks of eastern Kansas and southeastern Nebraska," compiled by M.G. Wilmarth, Secretary of Committee on Geologic Names, USGS unpub. corr. chart, Oct. 1936, sheet 2.
["Subgroup" not recognized as a formal stratigraphic rank term (CSN, 1933; ACSN, 1961, 1970; NACSN, 1983, 2005). Considered informal and should not be capitalized.]

Source: US geologic names lexicon (USGS Bull. 896, p. 1864); GNC KS-NE Pennsylvanian Corr. Chart, sheet 2, Oct. 1936.

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 does not conform with nomenclatural guidelines (CSN, 1933; ACSN, 1961, 1970; NACSN, 1983, 2005). This may be explained within brackets ([ ]).