1. Department of Geography; Northumbria University; Ellison Building Newcastle-upon-Tyne NE1 8ST UK
2. Geological Survey of Belgium; Royal Belgian Institute of Natural Sciences; Jennerstraat 13, 1000 Brussels Belgium
3. Department of Geography; Durham University; South Road Durham DH1 3LE UK
4. Pontificia Universidad Católica de Valparaíso; Escuela de Ciencias del Mar; Altamirano 1480, Valparaíso Chile