1. Department of Earth and Environmental Sciences, University of Manchester, M13 9PL Manchester, UK
2. Departamento de Ecología y Geología, Facultad de Ciencias, Universidad de Málaga, Málaga, Spain
3. Department of Palaeobiology, Swedish Museum of Natural History, PO Box 50007, 10405 Stockholm, Sweden
4. Department of Earth and Atmospheric Sciences, Indiana University Bloomington, 1001 E 10th St, Bloomington, IN, USA
5. Department of Earth and Environmental Sciences, University of Michigan, 1100 N University Ave, Ann Arbor, MI 48109, USA