1. Consolidated Research Group Marine Geosciences, Department of Stratigraphy, Paleontology and Marine Geosciences; Faculty of Geology, University of Barcelona; Barcelona Spain
2. Pyrenean Institute of Ecology; Spanish Research Scientific Council; Zaragoza Spain
3. Department of Geology; University of Salamanca; Salamanca Spain
4. Department of Environmental Chemistry; Institute of Chemical and Environmental Research-Spanish Research Scientific Council; Barcelona Spain
5. Department of Geological Sciences; University of Florida; Gainesville Florida USA