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Geologic Unit: Exline
Map showing publication footprint
  • Usage in publication:
    • Exline cyclothem
  • Modifications:
    • Original reference
  • AAPG geologic province:
    • Iowa shelf
    • 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. Exline cyclothem. Cyclothem in McLeansboro group. Present in Illinois and Iowa. In sequence above Gimlet cyclothem and below Trivoli cyclothem. Age is Pennsylvanian.
Named from Exline, Appanoose Co., IA.

Source: US geologic names lexicon (USGS Bull. 1200, p. 1305).


Map showing publication footprint
  • Usage in publication:
    • Exline cyclothem
  • Modifications:
    • Revised
  • 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. 50 (fig. 22), 119-121. Exline cyclothem. Includes Exline limestone and shale. Strata here referred to Exline cyclothem were formerly included in upper part of Gimlet cyclothem. Age is Pennsylvanian.

Source: US geologic names lexicon (USGS Bull. 1200, p. 1305).


Map showing publication footprint
  • Usage in publication:
    • Exline cyclothem
  • Modifications:
    • Not used
  • 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. 54 (table 3). Exline cyclothem. Term discontinued.

Source: US geologic names lexicon (USGS Bull. 1200, p. 1305).


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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