KGS--Stratigraphic Nomenclature--Paleozoic (Council Grove Group)

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 to base of Permian and change of name from Pennsylvanian to Carboniferous based on
Sawin, R.S., West, R.R., Franseen, E.K., Watney, W.L., and McCauley, J.R., 2006, Carboniferous-Permian Boundary in Kansas, Midcontinent, U.S.A.; in, Current Research in Earth Sciences: Kansas Geological Survey, Bulletin 252, part 2.
http://www.kgs.ku.edu/Current/2006/sawin/index.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

Change of System name to Carboniferous and movement of Pennsylvanian to Subsystem based on
Sawin, R.S., Franseen, E.K., Watney, W.L., West, R.R., and Ludvigson, G.A., 2009, New Stratigraphic Rank for the Carboniferous, Mississippian, and Pennsylvanian in Kansas; in, Current Research in Earth Sciences: Kansas Geological Survey, Bulletin 256, part 1.
http://www.kgs.ku.edu/Current/2009/Sawin/index.html