- Usage in publication:
-
- Sac-Fox subgroup [informal]
- Modifications:
-
- Original reference
- Dominant lithology:
-
- Shale
- Limestone
- Coal
- AAPG geologic province:
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- Forest City basin
- Nemaha anticline
Summary:
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, 2021). 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 conflicts with nomenclatural guidelines (CSN, 1933; ACSN, 1961, 1970; NACSN, 1983, 2005, 2021). May be explained within brackets ([ ]).