1. Faculty of Geography, Herzen State Pedagogical University of Russia, 191186 Saint-Petersburg, Russia
2. Institute of Geology, Karelian Research Centre, Russian Academy of Sciences, 185910 Petrozavodsk, Russia
3. A.N. Severtsov Institute of Ecology and Evolution, Russian Academy of Sciences, 119071 Moscow, Russia
4. Baltic Archaeology Research Centre, 236000 Kaliningrad, Russia
5. FindX Research Center, 8031 VK Zwolle, The Netherlands