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Geologic Unit: Grindstaff
Map showing publication footprint
  • Usage in publication:
    • Grindstaff 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). Grindstaff cyclothem in Tradewater group. In list of cyclothems of southern Illinois, the Grindstaff occurs at base of Tradewater group and underlies Delwood cyclothem. Age is Pennsylvanian.

Source: US geologic names lexicon (USGS Bull. 1200, p. 1617).


Map showing publication footprint
  • Usage in publication:
    • Grindstaff 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. 5, 9, pl. 1. Grindstaff cyclothem in Tradewater group. Includes (ascending) Grindstaff sandstone, Willis coal, and Boskydell marine horizon. Underlies Delwood cyclothem; overlies Pounds cyclothem of Caseyville group. Age is Pennsylvanian. Type locality given.
Type locality: in NE/4 sec. 28, T. 10 S., R. 8 E., Gallatin Co., southern IL.

Source: US geologic names lexicon (USGS Bull. 1200, p. 1617).


Map showing publication footprint
  • Usage in publication:
    • Grindstaff cyclothem
  • Modifications:
    • Overview
  • 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. 52 (table 2), pl. 1. Grindstaff cyclothem in Abbott formation (new) of McCormick group (new). Above Pounds cyclothem and below Delwood cyclothem. 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. 1617).


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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