1. School of Earth Sciences; University of Bristol; Bristol BS8 1RJ UK
2. Department of Earth Sciences; Royal Holloway; Egham Surrey TW20 0EX UK
3. Ocean and Earth Science; National Oceanography Centre Southampton; University of Southampton Waterfront Campus; European Way Southampton SO14 3ZH UK
4. Natural Science Department; New Brunswick Museum; 277 Douglas Avenue Saint John New Brunswick E2K 1E5 Canada
5. Department of Earth and Environmental Science; Acadia University; Wolfville Nova Scotia B4P 2R6 Canada
6. School of Life Sciences; University of Lincoln; Green Lane Lincoln LN6 7DL UK
7. New Brunswick Department of Energy and Mines; Geological Surveys Branch; Fredericton New Brunswick E3B 5H1 Canada