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

Cooper, C.L., 1946, Pennsylvanian ostracodes of Illinois: Illinois Geological Survey Bulletin, no. 70, 177 p. [Includes faunal chart, available online from the Illinois Geological Survey library: http://www.isgs.uiuc.edu/library]


Summary:

Pg. 12, 16 (fig. 2). Hall cyclothem. Pennsylvanian succession between the Gimlet and LaSalle cyclothems, exposed in upper Illinois valley, contains several prominent but thin limestones which are basis for recognition of incomplete cyclothems to which the names (ascending) Turner, Hicks, and Hall have been applied by H.B. Willman.

Source: US geologic names lexicon (USGS Bull. 1200, p. 1648).


Map showing publication footprint
  • Usage in publication:
    • Hall 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. 12, pl. 1. Hall cyclothem. Includes Hall limestone. Age is Pennsylvanian. Type locality given.
Type locality: in NW/4 SW/4 sec. 33, T. 16 N., R. 11 E., Bureau Co., northern IL.

Source: US geologic names lexicon (USGS Bull. 1200, p. 1648).


Map showing publication footprint
  • Usage in publication:
    • Hall 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. Hall cyclothem in Modesto-Bond formations (both new) in McLeansboro group. Above Hicks 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. 1648).


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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