1. Sedimentary Petrology Laboratory, Liège University, 4000 Liège, Belgium
2. Department of Earth Sciences, Utrecht University, PO Box 80125, 3508 TC Utrecht, Netherlands
3. MARUM–Zentrum für Marine Umweltwissenschaften, Universität Bremen, 28359 Bremen, Germany
4. Institute of Geology of the Czech Academy of Sciences, CZ-165 00 Prague 6 – Lysolaje, Czech Republic