1. Department of Geography, Memorial University of Newfoundland, St John's, Newfoundland and Labrador A1B 3X9, Canada
2. US Geological Survey, Marine and Coastal Geology, 345 Middlefield Road, Menlo Park, California 94205, USA
3. Norwegian Geotechnical Institute, Postboks 3930, Ulleval Stadion, N-0806 Oslo, Norway
4. Geological Survey of Canada, Natural Resources Canada, PO Box 1006, Dartmouth, Nova Scotia B2Y 4A2, Canada
5. Scott Polar Research Institute, University of Cambridge, Cambridge CB2 1ER, UK
6. GRC Geociències Marines, Universitat de Barcelona, 08028 Barcelona, Spain
7. Department of Geological Sciences, Stockholm University, Svante Arrhenius väg 8, 106 91 Stockholm, Sweden
8. British Antarctic Survey, Natural Environment Research Council, High Cross, Madingley Road, Cambridge CB3 0ET, UK