1. Geological Survey of Norway, P.O. Box 6315 Torgarden, 7491 Trondheim, Norway.
2. Centre for Arctic Gas Hydrate, Environment and Climate, Department of Geosciences, UiT The Arctic University of Norway, Tromsø, Norway.
3. British Geological Survey, Keyworth, Nottingham NG12 5GG, UK.
4. Department of Geology, Tallinn University of Technology, Tallinn, Estonia.
5. MARUM–Center for Marine and Environmental Sciences and Department of Geosciences, University of Bremen, 28334 Bremen, Germany.