1. Department of Earth Sciences Royal Holloway University of London Egham Surrey TW20 0EX UK
2. British Antarctic Survey High Cross Madingley Road Cambridge CB3 0ET UK
3. Istituto Nazionale di Oceanografia e di Geofisica Sperimentale Borgo Grotta Gigante Trieste 42/c 34010 Italy
4. Centre for Arctic Gas Hydrate, Environment and Climate UiT The Arctic University of Norway Naturfagbygget Dramsveien 201 9010 Tromsø Norway
5. Departamento de Estratigrafía y Paleontología Universidad de Granada 18002 Granada Spain