1. Department of Earth Sciences, University of Oxford, Oxford OX1 3AN, UK.
2. Institute of Earth’s Crust, Russian Academy of Sciences, Siberian Branch, 128 Lermontova Street, Irkutsk 664033, Russia.
3. Swiss Federal Institute of Technology Zürich (ETH Zürich), CH-8092 Zürich, Switzerland.
4. Institute of Geography, Mongolian Academy of Sciences, 210620 UlaanBaatar, Mongolia.
5. Arabica Speleological Club, Mamin-Sibiryak Street, Box 350, Irkutsk 554082, Russia.