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Geologic Unit: Flat Creek
Map showing publication footprint
  • Usage in publication:
    • Flat Creek cyclothem
  • Modifications:
    • Overview
  • AAPG geologic province:
    • Illinois basin
Publication:

Wanless, H.R., 1955, Pennsylvanian rocks of Eastern Interior basin: American Association of Petroleum Geologists Bulletin, v. 39, no. 9, p. 1753-1820.


Summary:

Pg. 1764 (table 2). Flat Creek cyclothem in McLeansboro group. Name appears in list of cyclothems in McLeansboro group. Occurs below an unnamed cyclothem below the Millersville cyclothem and above Bunje cyclothem (new). Age is Pennsylvanian. Present in south-central Illinois.

Source: US geologic names lexicon (USGS Bull. 1200, p. 1363-1364).


Map showing publication footprint
  • Usage in publication:
    • Flat Creek cyclothem
  • Modifications:
    • Principal reference
  • AAPG geologic province:
    • Illinois basin
Publication:

Wanless, H.R., 1956, Classification of the Pennsylvanian rocks of Illinois as of 1956, [with Correlation chart compiled by Raymond Siever]: Illinois Geological Survey Circular, no. 217, 14 p.


Summary:

Pg. 6, 7, 11, pl. 1. Flat Creek cyclothem in McLeansboro group. Simon (1946, unpub. thesis) worked out sequence above Shoal Creek limestone in Bond County and proposed terms (ascending) Sorento, Bunje, and Flat Creek for cyclothemic units in lower half of interval. A persistent cyclic succession intervenes between the Flat Creek and Millersville; term Reel limestone has been used for the limestone in this succession. Age is Pennsylvanian. Type locality given.
Type locality: center E/2 sec. 24, T. 6 N., R. 6 W., Bond Co., IL.

Source: US geologic names lexicon (USGS Bull. 1200, p. 1363-1364).


Map showing publication footprint
  • Usage in publication:
    • Flat Creek cyclothem
  • Modifications:
    • Revised
  • AAPG geologic province:
    • Illinois basin
Publication:

Kosanke, R.M., Simon, J.A., Wanless, H.R., and Willman, H.B., 1960, Classification of the Pennsylvanian strata of Illinois: Illinois Geological Survey Report of Investigations, no. 214, 84 p.


Summary:

Pg. 39, 50 (table 1), 72, pl. 1. Flat Creek cyclothem in Bond formation (new) of McLeansboro group. Below Witt cyclothem (new). Present in south-central Illinois. Age is Pennsylvanian. Presentation of new rock-stratigraphic classification of Pennsylvanian strata in Illinois; cyclical classification is independent of rock-stratigraphic classification.

Source: US geologic names lexicon (USGS Bull. 1200, p. 1363-1364).


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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