Watney, W.L.

Ludvigson, G.A.; Sawin, R.S.; Franseen, E.K.; Watney, W.L.; West, R.R.; Smith, J. 2009. A review of the stratigraphy of the Ogallala Formation and revision of Neogene (Tertiary) nomenclature in Kansas. Current Research in Earth Sciences, Bulletin 256, part 2: pp. 1-9, 2 figs. http://www.kgs.ku.edu/Current/2009/Ludvigson/index.html