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Geologic Unit: Isabel
Map showing publication footprint
  • Usage in publication:
    • Isabel sandstone
  • Modifications:
    • Original reference
  • Dominant lithology:
    • Sandstone
  • AAPG geologic province:
    • Illinois basin
Publication:

Wanless, H.R., 1931, Pennsylvanian cycles in western Illinois, IN Papers presented at the Quarter centennial celebration of the Illinois State Geological Survey: Illinois Geological Survey Bulletin, no. 60, p. 179-193.


Summary:

Isabel sandstone. A name applied to an undescribed sandstone, 7 to 50 feet thick, near top of Pottsville formation (Pennsylvanian) of central western Illinois. Shown on p. 192 as unconformably overlain by a thin bed of shale underlying coal No. 2, and as in places cutting out all beds down to near top of his [H.R. Wanless'] Bernadotte sandstone.
Origin of name not stated.

Source: US geologic names lexicon (USGS Bull. 896, p. 1027).


Map showing publication footprint
  • Usage in publication:
    • Isabel sandstone
  • Modifications:
    • Principal reference
    • 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), 83-84, 191, 197, 198, 199. Isabel sandstone of Carbondale group. Fairly well indurated; upper part commonly thin-bedded and lower part more massive. Six inches to about 10 feet thick, reaching maximum thickness near type outcrop. Included in Abingdon cyclothem.
Type locality: high bank on southeast side of ravine, in NW/4 NE/4 sec. 16, T. 4 N., R. 3 E., Havana quadrangle, Fulton Co., western IL. Named from Isabel Twp.

Source: US geologic names lexicon (USGS Bull. 1200, p. 1888).


Map showing publication footprint
  • Usage in publication:
    • Isabel sandstone member
  • 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. 33, 46 (table 1), 62, pl. 1. Isabel sandstone member of Spoon formation (new) of Kewanee group (new). Rank reduced to member status in Spoon formation (new). Occurs above Greenbush coal member and below Abingdon coal member. Age is Pennsylvanian. Presentation of new rock-stratigraphic classification of Illinois.

Source: US geologic names lexicon (USGS Bull. 1200, p. 1888).


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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