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Forest City Basin

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Figure 7--Cross sections showing unconformities at the base of the Devonian limestone and at the base of the Chattanooga shale, on lines A-B and C-D of inset map. The cross sections are correlated on the top of the St. Peter sandstone. The relations shown at the top of the Silurian were produced by a regional tilting toward the northwest after Silurian deposition and by subsequent erosional beveling. The Devonian rocks were deposited upon this surface. The region was again tilted in the same direction after Devonian time and again peneplaned. This was followed by deposition of Chattanooga shale.

Figures at left of wells at top show depth in feet below the surface. Figures at right of well show thickness in feet of lithologic units. A larger version of this figure is available as an Acrobat PDF file (608 KB).

two cross sections; A-B from Riley to Miami County; C-D from Nemaha to Johnson County

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Kansas Geological Survey, Forest City Basin
Comments to webadmin@kgs.ku.edu
Web version July 2005. Original publication date Dec. 1943.
URL=http://www.kgs.ku.edu/Publications/Bulletins/51/fig7.html