1. Department of Geoscience University of Calgary Calgary T2N 1N4 AB Canada
2. Department of Geography University of Durham Durham DH1 3LE UK
3. National Oceanography Centre Southampton SO14 3ZH UK
4. Center for Coastal and Ocean Mapping University of New Hampshire Durham 03824 NH USA
5. Chevron Center of Research Excellence Department of Geology and Geological Engineering Colorado School of Mines Golden 80401 CO USA
6. Natural Resources Canada Geological Survey of Canada Sidney V8L 4B2 BC Canada
7. Ocean and Earth Sciences University of Southampton Southampton SO14 3ZH UK