Figure 12--Map of northeastern Kansas showing thickness of rocks between top of Maquoketa shale and the base of the Chattanooga shale.
Isopachous lines connecting points of equal thickness are drawn at intervals of 50 feet. Dots show locations of wells used as source of data. Diagonal lines show margin of area from which Maquoketa shale was removed by pre-Devonian and pre-Chattanooga erosion. Checkered area indicates area from which base of Chattanooga shale was removed by post-Mississippian erosion.
Kansas Geological Survey, Forest City Basin
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Web version July 2005. Original publication date Dec. 1943.