1. Institute of Geology and Mineralogy; University of Cologne; Cologne 50674 Germany
2. Institute of Geological Sciences, Palaeonotology Section; Free University of Berlin; Berlin 12249 Germany
3. Northeast Interdisciplinary Research Institute; Far East Branch Russian Academy of Sciences; Magadan 685000 Russia
4. Earth and Space Sciences; Quaternary Research Center; University of Washington; Seattle WA 98195 USA
5. Institute of Geology and Petroleum Technologies; Kazan Federal University; Kazan 420008 Russia