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National Geologic Map Database
Geologic Unit: Oak
Map showing publication footprint
  • Usage in publication:
    • Oak formation
  • Modifications:
    • Named
  • Dominant lithology:
    • Loam
  • AAPG geologic province:
    • Illinois basin
Publication:

Esling, S.P., Follmer, L.R., and Henderson, E.D., 1991, Surficial geology, IN Nelson, W.J., and others, Geology of the Eddyville, Stonefort, and Creal Springs quadrangles, southern Illinois: Illinois Geological Survey Bulletin, no. 96, p. 45-60, (incl. geologic maps, scale 1:24,000), Accompanied by the Creal Springs (IGQ-4), Eddyville (IGQ-5), and Stonefort (IGQ-6) Illinois Geol. Survey Geol. Quad. Ser. maps, scale 1:24,000. Available online.


Summary:

Informal name Oak formation proposed to replace a variety of common names (residual material, weathered bedrock, paleosol geest, clay, and pedisediment) used for the pre-Illinoian deposits that underlie the Glasford Formation, the Teneriffe Silt, or the Loveland Silt in the study area. Oak formation is a residuum, a product mainly of in situ weathering, and has attributes of both a soil and a lithologic unit. It is laterally continuous in the study area and has lithologic properties distinctly different from those of the underlying indurated bedrock.

Source: GNU records (USGS DDS-6; Reston GNULEX).


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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