Figure 15--Map of northeastern. Kansas showing thickness of rocks between the top of the Maquoketa shale and the top of the Chattanooga shale.
Checkered pattern shows area from which top of Chattanooga shale was removed by post-Mississippian erosion. Diagonal lines show margin of area from which top of Maquoketa shale was removed by pre-Devonian and pre-Chattanooga erosion. Isopachous lines connecting points of equal thickness are drawn at intervals of 50 feet. Dots show locations of wells used as source data.
Kansas Geological Survey, Forest City Basin
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Web version July 2005. Original publication date Dec. 1943.