Figure 9--Map of northeastern Kansas showing thickness of rocks between the top of the Precambrian and the top of the St. Peter sandstone. Isopachous lines connecting points of equal thickness are drawn at intervals of 100 feet. Diagonal pattern indicates areas from which St. Peter sandstone has been eroded. Dots show location of wells used as source of data.
Kansas Geological Survey, Forest City Basin
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Web version July 2005. Original publication date Dec. 1943.