1. Russian Geological Research Institute Sredny Prospect 74 St. Petersburg 199106 Russia
2. Institute of Earth Science St. Petersburg University Universitetskaya nab., 7-9 St. Petersburg 199034 Russia
3. Zoological Institute Russian Academy of Science Universitetskaya 1 St. Petersburg 199034 Russia
4. DTU Physics Technical University of Denmark DTU Risø Campus, Frederiksborgvej 399 Roskilde 4000 Denmark