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

Wanless, H.R., 1955, Pennsylvanian rocks of Eastern Interior basin: American Association of Petroleum Geologists Bulletin, v. 39, no. 9, p. 1753-1820.


Summary:

Pg. 1764 (table 2). Delwood cyclothem in Tradewater group. Underlies Macedonia cyclothem and overlies Grindstaff cyclothem. Age is Pennsylvanian. Present in southern Illinois.

Source: US geologic names lexicon (USGS Bull. 1200, p. 1086).


Map showing publication footprint
  • Usage in publication:
    • Delwood 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. 9. Delwood cyclothem in Tradewater group. Type locality designated. Age is Pennsylvanian.
Type locality: in sec. 5, T. 11 S., R. 6 E., Pope Co., southern IL.

Source: US geologic names lexicon (USGS Bull. 1200, p. 1086).


Map showing publication footprint
  • Usage in publication:
    • Delwood 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), 54 (table 3). Delwood cyclothem in Abbott formation (new) of McCormick group (new). Age is Pennsylvanian. Present in southern Illinois.

Source: US geologic names lexicon (USGS Bull. 1200, p. 1086).


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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