Figure 18
Figure 18--Map showing thickness of Pierre Shale in northwestern Kansas. Several small outliers of Pierre Sale, probably occurring in grabens, are east of east limit of formation. Contour interval 100 feet.
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/fig018.html