Paleogeomorphology of the Sub-Pennsylvanian Unconformity of the Arbuckle Group (Cambrian-Lower Ordovician)
Kansas Geological Survey
Open-file Report 2001-55

Stratigraphic cross-section across an Arbuckle doline. Notice the thickening of basal Pennsylvanian fill.

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Last updated January 2002
http://www.kgs.ku.edu/PRS/publication/OFR2001-55/P2-06.html