Younger... || Start || Older...

Original Version


original version of Paleozoic chart, Upper and Middle Ordovician Series


Original Version

Younger... || Start || Older...

Original Ordovician stratigraphy discussed in Goebel, E.D., 1968, Ordovician System, in, Zeller, D.E., (ed.); The stratigraphic succession in Kansas: Kansas Geological Survey, Bulletin, no. 189, pp. 14-15 http://www.kgs.ku.edu/Publications/Bulletins/189/05_ordo.html