High-terrace chert gravel resting on Kinney Limestone, in headwaters of the Little Walnut drainage, near crest of Flint Hills (> 450 m elev.) in eastern Butler County. This terrace gravel contains exotic quartzite derived from the west. The presence of exotics here implies a reversal in drainage since the Miocene. Scale pole marked in feet; photo © by J.S. Aber, 9/90.
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