1. Palaeo-environmental Dynamics Group; Institute of Geosciences; Goethe University Frankfurt; Altenhöfer Allee 1 60438 Frankfurt am Main Germany
2. Geological and Environmental Sciences; Stanford University; 450 Serra Mall Stanford CA 94305 USA
3. UMR; CNRS 5276; LGLTPE; Université Lyon 1 F-69622 Villeurbanne France
4. Academy of Sciences; University of Graz; Heinrichstraße 26 8020 Graz Austria