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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--Table 1

Table 1. Minimum amount of vertical erosion in eastern Kansas drainage basins.

Drainage Basin Erosion
Walnut 80 m (260 ft)
Verdigris 80 m (260 ft)
Marais des Cygnes 70 m (230 ft)
Neosho 50 m (160 ft)
Fall 50 m (160 ft)
Cottonwood 40 m (130 ft)

Kansas Geological Survey
Web version March 18, 1998
http://www.kgs.ku.edu/Current/1997/aber/table1.html
email:lbrosius@kgs.ku.edu