1. School of Earth Sciences; University of Bristol; Bristol BS8 1RJ UK
2. Ocean and Earth Science; National Oceanography Centre Southampton; University of Southampton Waterfront Campus; European Way Southampton SO14 3ZH UK
3. Department of Earth Sciences; Royal Holloway; Egham Surrey TW20 0EX UK
4. Joggins Fossil Centre; 100 Main Street Joggins Nova Scotia B0L 1A0 Canada