Definition of Wisconsinan Stage : the Wisconsinan Stage and its Altonian, Farmdalian, Woodfordian, Twocreekan, and Valderan Substages are described as time-stratigraphic units of the Pleistocene of Illinois and Wisconsin / by John C. Frye, H.B. Willman, Meyer Rubin, and Robert F. Black.
- Physical Description: 1 online resource (iii, 22 pages) : illustrations.
- Publisher: [Washington, D.C.] : United States Department of the Interior, Geological Survey, 1968.
- Distributor: Washington : United States Government Printing Office
|General Note:|| Title from title screen (viewed September 15, 2014).
|Bibliography, etc. Note:|| Includes bibliographical references (pages 20-22).
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- Geological Survey bulletin ; 1274-E
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