Dear Listmembers, The people on this list, who work with the K-T Boundary might consider the likelyhood that the recent formal ratification of the Quaternary System/Period and the Pleistocene Series/Epoch systems has changes the "K-T Boundary" to the "K-Pg Boundary" As discussed by Gibbad et al. (2009), the formal ratification of the Quaternary System/Period and the Pleistocene Series/Epoch systems by the Executive Committee of the International Union of Geological Sciences (IUGS) has eliminated the "Tertiary" as a formally recognized Period. As a result, the Cenozoic Era is now divided into the Paleogene, Neogene, and Quaternary periods and the "Tertiary" has been completely abandoned as either a period or sub-era as shown in figure 1 of Gibbard et al. (2009). This means that that the "tertiary" has been stripped of any formal status in stratigraphic nomenclature. Thus, the "Cretaceous- Tertiary Boundary" is no longer recognized terminology and leaves the Cretaceous-Paleogene Boundary as the only officially sanctioned way in terms of stratigraphic nomenclature of designating this boundary.
Reference Cited Gibbard , P L., M. J. Head , M. J. C. Walker, the Subcommission on Quaternary Stratigraphy, 2009, Formal ratification of the Quaternary System/Period and the Pleistocene Series/Epoch with a base at 2.58 Ma. Journal of Quaternary Science. Published Online: 22 Sep 2009 http://www3.interscience.wiley.com/journal/122602421/abstract Yours, Paul H. ______________________________________________ http://www.meteoritecentral.com Meteorite-list mailing list Meteorite-list@meteoritecentral.com http://six.pairlist.net/mailman/listinfo/meteorite-list
