1. School of GeoSciences, University of Edinburgh, James Hutton Road, Edinburgh EH9 3FE, UK
2. Borissiak Paleontological Institute, Russian Academy of Sciences, ul. Profsoyuznaya 123, Moscow 117997, Russia
3. Department of Biological Evolution, Faculty of Biology, Lomonosov Moscow State University, Leninskie gory 1(12), Moscow 119234, Russia
4. Geological Institute, Russian Academy of Sciences, Pyzhevskiy per. 7, Moscow 119017, Russia