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Figure 25
Figure 25--Map of Kansas showing present configuration of surface at base of Cretaceous beds, i.e., topographic features that were developed on pre-Cretaceous surface. Three major northward-trending valleys and their tributaries are shaded. Contour interval 100 feet. Additional detailed work was done on this surface by Schuman (1963); Jesse McNellis (personal communication, August 13, 1963) believes the valley as shown in Rush County is due to a miscorrelation of placing the Cretaceous-Permian contact.
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Kansas Geological Survey, Geologic History of Kansas
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Web version April 2006. Original publication date Dec. 1963.
URL=http://www.kgs.ku.edu/Publications/Bulletins/162/fig025.html