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  • Usage in publication:
    • Ford Station Member
  • Modifications:
    • Named
  • Dominant lithology:
    • Shale
    • Limestone
  • AAPG geologic province:
    • Illinois basin
Publication:

Swann, D.H., 1963, Classification of Genevievian and Chesterian (Late Mississippian) rocks in Illinois: Illinois Geological Survey Report of Investigations, no. 216, 91 p.


Summary:

Name formally proposed in this report for upper member of Clore Formation of Elviran age. Consists of interbedded shale and limestone with rare sandstone lenses. Typically 20 to 50 ft thick. Type section consists of 38 ft of shale containing limestone units a few inches to 5 ft thick that is overlain by Degonia Sandstone and separated from Palestine formation by 35 ft of poorly exposed shale assigned to other members of the Clore. Overlies Tygett Sandstone Member (new name); underlies Lusk Shale Member of Caseyville Formation. Age is Chesterian.

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


Map showing publication footprint
  • Usage in publication:
    • Ford Station Member
  • Modifications:
    • Overview
  • AAPG geologic province:
    • Illinois basin
Publication:

Nelson, W.J., Devera, J.A., and Jacobson, R.J., 1991, Stratigraphy of the bedrock [includes abstract and introduction], IN Nelson, W.J., and others, Geology of the Eddyville, Stonefort, and Creal Springs quadrangles, southern Illinois: Illinois Geological Survey Bulletin, no. 96, p. 1-43, (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:

Clore Formation in the study area is subdivided into (ascending ) Cora, Tygett Sandstone, and Ford Station Members of Swann (1963). Unit can be correlated in outcrop and subsurface throughout southern IL. Ford Station Member consists of 23 to 50 ft of interbedded shale and limestone. Age is Chesterian.

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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