1. Oxford University Museum of Natural History, University of Oxford, Parks Road, Oxford OX1 3PW, UK.
2. British Geological Survey, Nicker Hill, Keyworth, Nottingham NG12 5GG, UK.
3. School of Earth Sciences, University of Bristol, Life Sciences Building, Tyndall Avenue, Bristol BS8 1TQ, UK.
4. Department of Earth Sciences, University of Cambridge, Downing Street, Cambridge CB2 3EQ, UK.
5. Trofimuk Institute of Petroleum Geology and Geophysics, Prospekt Akademika Koptyuga 3, Novosibirsk 630090, Russia.
6. Novosibirsk State University, Pirogova Street 1, Novosibirsk 630090, Russia.
7. School of Geography, Geology and the Environment, University of Leicester, University Road, Leicester LE1 7RH, UK.