1. Institute of Earth Surface Dynamics, University of Lausanne, Quartier UNIL-Mouline, 1015 Lausanne, Switzerland;
2. Department of Palaeontology, University of Zürich, Karl-Schmid-Strasse 4, 8006 Zürich, Switzerland;
3. Institute of Earth Sciences, University of Lausanne, Quartier UNIL-Mouline, CH-1015 Lausanne, Switzerland;
4. Section of Earth and Environmental Sciences, University of Geneva, Rue des Maraîchers 13, CH-1205 Geneva, Switzerland;
5. Natural History Museum, University of Oslo, Pb. 1172 Blindern, 0318 Oslo, Norway;