1. Institute for the History of Material Culture, Russian Academy of Sciences, 18 Dvortsovaya nab., St. Petersburg 191186, Russia.
2. Geological Institute, Russian Academy of Sciences, 7 Pyzhevsky pereulok, Moscow 119017, Russia.
3. Geological Research Laboratory of the North, Faculty of Geography, Moscow State University, Leninskie Gory, Moscow 119992, Russia.
4. Arctic and Antarctic Research Institute, 38 Bering Street, St. Petersburg 199397, Russia.