1. School of Energy, Geoscience, Infrastructure and Society; Heriot-Watt University; Edinburgh EH144AS UK
2. Department of Earth Sciences; Royal Holloway University, London; Egham TW20 0EX Surrey UK
3. School of Geography and the Environment; Oxford University; Oxford OX1 3QY UK
4. Dpto. de Xeociencias Mariñas e O.T.; Univ. Vigo; Vigo, Pontevedra E-36310 Spain
5. Université de Bordeaux; UMR CNRS 5805 EPOC; Allée Geoffroy St Hilaire 33615 Pessac cedex France
6. Instituto Geológico y Minero de España (IGME); Rios Rosas 23 Madrid 28003 Spain
7. Centro de Investigaciones Marinas y Ambientales (CMIMA-CSIC); Paseo Marítimo Barceloneta, 37-49 Barcelona 08003 Spain