1. Department of Environmental Chemistry Institut d'Investigacions Quimiques i Ambientals de Barcelona–Consell Superior d'Investigacions Cientifiques (CSIC), 08034-Barcelona, Spain.
2. Department of Stratigraphy, Paleontology, and Marine Geosciences, University of Barcelona, 08028-Barcelona, Spain.
3. Department of Geology, University of Salamanca, 37008-Salamanca, Spain.
4. Department of Geological Sciences, University of Florida, Gainesville, FL 32611–2120, USA.