In a serendipitous coincidence, the Working Group on the Paleocene/Eocene boundary was established at the 28th International Geological Congress (Washington 1989) just as the definitive evidence of a significant early Paleogene global event, seen in biotic and isotopic data within Magnetic Polarity Chron C24, was being obtained from cores taken in the Southern Ocean on Leg 113 of the Ocean Drilling Program (Barker, Kennett et al. 1988). Because it soon became apparent that consequences of this event were already the basis for recognizing the Paleocene-Eocene transition in various regional chronostratigraphies, i.e. in North American land mammals and in...

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