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Original Permian stratigraphy discussed in O'Connor, H.G., Zeller, D.E., Bayne, C.K., Jewett, J.M., and Swineford, Ada, 1968, Permian System, in, Zeller, D.E., (ed.); The stratigraphic succession in Kansas: Kansas Geological Survey, Bulletin, no. 189, pp. 43-53 http://www.kgs.ku.edu/Publications/Bulletins/189/08_perm.html
Change of Series/Epoch name based on
Sawin, R.S., Franseen, E.K., West, R.R., Ludvigson, G.A., and Watney, W.L., 2008, Clarification and Changes in Permian Stratigraphic Nomenclature in Kansas; in, Current Research in Earth Sciences: Kansas Geological Survey, Bulletin 254, part 2. http://www.kgs.ku.edu/Current/2008/Sawin/index.html