1. Department of Geological Sciences, University of Saskatchewan, 114 Science Place, Saskatoon, SK S7N 5E2, Canada.
2. School of the Environment, Geography and Geosciences, University of Portsmouth, Portsmouth, Hampshire PO1 3QL, UK.
3. Marine Research Department, Senckenberg am Meer, Südstrand 40, 26382 Wilhelmshaven, Germany.
4. Department of Earth Sciences, The College of Wooster, Wooster, OH 44691, USA.
5. Eastern Energy Resources, United States Geological Survey, 12201 Sunrise Valley Dr., Reston, VA 20192, USA.