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Geologic Unit: Jamestown
Map showing publication footprint
  • Usage in publication:
    • Jamestown cyclothem
  • Modifications:
    • Original reference
  • AAPG geologic province:
    • Illinois basin
Publication:

Weller, J.M., 1942, Rhythms in Upper Pennsylvanian cyclothems: Illinois Academy of Science Transactions, v. 35, no. 2, p. 145-146.


Summary:

Pg. 145 (table 1). Jamestown cyclothem. In list of cyclothems in McLeansboro, occurs below Bankston Fork cyclothem and above Brereton cyclothem. Present in southeastern Illinois. Age is Pennsylvanian.

Source: US geologic names lexicon (USGS Bull. 1200, p. 1910).


Map showing publication footprint
  • Usage in publication:
    • Jamestown cyclothem
  • Modifications:
    • Principal reference
    • Revised
  • 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. 10, pl. 1. Jamestown cyclothem. Shown on correlation chart at top of Carbondale group. Includes Pokeberry limestone in western Illinois and Jamestown limestone in southern Illinois. Age is Pennsylvanian. Type locality given.
In NW/4 NE/4 sec. 34, T. 5 S., R. 4 W., in vicinity of Jamestown, Perry Co., southern IL.

Source: US geologic names lexicon (USGS Bull. 1200, p. 1910).


Map showing publication footprint
  • Usage in publication:
    • Jamestown cyclothem
  • Modifications:
    • Overview
  • AAPG geologic province:
    • Illinois basin
Publication:

Wanless, H.R., 1957, Geology and mineral resources of the Beardstown, Glasford, Havana, and Vermont quadrangles: Illinois Geological Survey Bulletin, no. 82, 233 p.


Summary:

Pg. 113. Jamestown cyclothem. Believed to be equivalent of Pokeberry cyclothem. Age is Pennsylvanian.

Source: US geologic names lexicon (USGS Bull. 1200, p. 1910).


Map showing publication footprint
  • Usage in publication:
    • Jamestown 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. 52 (table 2), pl. 1. Jamestown cyclothem. In Carbondale formation of Kewanee group (new). Above Brereton cyclothem; in some areas, below Sparland cyclothem and in others below Bankston. 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. 1910).


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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