Bio stratigraphy of terrestrial Pleistocene sequences is a principal discussion topic nowadays. There are many problems arising from the correlation of the geological sequences in different parts of the world, while numerical chronostratigraphical methods have serious restrictions. For example, the radiocarbon method (~(14)C) can only date the latest Pleistocene deposits. The results of the optically stimulated luminescence (OSL), electron spin resonance (ESR) methods are very strongly debated. Palaeomagnetic data are widely used and can certainly assist in the dating of deposits, but they can be used only along with palaeobiological markers. Thus the topic of the session G22.11 "Pleistocene chronostratigraphic subdivisions and stratigraphic boundaries in the mammal records" held at the 32nd International Geological Congress (2004, Florence) was focused on the main results of investigation of mammalian records in the Quaternary sequences in different parts of Eurasia and their use in the chronos-tratigraphy and the definition of the principal stratigra-phical boundaries. The latter was a particularly topical discussion, since the International subcommission of Quaternary stratigraphy (SQS) was deliberating on the definition of formal boundaries for the subdivision of the Pleistocene. The contribution of the terrestrial biostrati-graphy, particularly of mammals to these definitions, was also discussed at length.
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