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

Weller, J.M., and Bell, A.H., 1936, The geology and oil and gas possibilities of parts of Marion and Clay Counties, [Illinois], with a discussion of the central portion of the Illinois basin: Illinois Geological Survey Report of Investigations, no. 40, 54 p.


Summary:

Pg. 26 (fig. 5). LaSalle cyclothem in McLeansboro formation. Shown on columnar section. Occurs above Macoupin cyclothem. Present in northern Illinois. Age is Pennsylvanian.

Source: US geologic names lexicon (USGS Bull. 1200, p. 2110).


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

Weller, J.M., and Newton, W.A., 1938, Upper Pennsylvanian section in the Illinois coal basin [abs.]: Geological Society of America Proceedings, 1937, p. 329.


Summary:

Upper part of McLeansboro, from Shoal Creek limestone up to highest Pennsylvanian strata is divided into following cyclothems (descending): Merom, Shumay, Woodbury, Gila, Greenup, Newton, Upper Bogota, Lower Bogota, Cohn, LaSalle, Macoupin, Flannigan, and Shoal Creek. Age is Pennsylvanian.

Source: US geologic names lexicon (USGS Bull. 1200, p. 2110).


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

Weller, J.M., and Bell, A.H., 1941, [Summary], IN Newton, W.A., Surface structure map of Shelby, Effingham, and Fayette Counties [Illinois]: Illinois Geological Survey Report of Investigations, no. 76, p. __.


Summary:

Pg. 7. LaSalle cyclothem. In Effingham, Fayette, and Shelby Counties, northern Illinois, includes LaSalle limestone. Age is Pennsylvanian.

Source: US geologic names lexicon (USGS Bull. 1200, p. 2110).


Map showing publication footprint
  • Usage in publication:
    • LaSalle 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), 55 (table 3). LaSalle cyclothem. In Bond-Mattoon formations (both new). Present in northern Illinois. Age is Pennsylvanian.

Source: US geologic names lexicon (USGS Bull. 1200, p. 2110).


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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