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Kansas Geological Survey, Current Research in Earth Sciences, Bulletin 240, part 3
Chert Gravel and Neogene Drainage in East-central Kansas--Fig. 7

Fig. 7. Selection of exotic pebbles from upland chert gravel in the lower Walnut basin in southern Butler County. Pebbles are quartzite and quartzose sandstone. Swiss knife for scale.

Kansas Geological Survey
Web version March 18, 1998
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