1. Institute of Paleobiology, Polish Academy of Sciences, Twarda 51/55, PL-00-818 Warsaw, Poland.
2. Department of Geosciences, Princeton University, Princeton, NJ 08544, USA.
3. School of Oceanography, University of Washington, 1492 NE Boat Street, Seattle, WA 98105, USA.
4. Marine Sciences Department, Federal University of São Paulo, Santos, São Paulo 11030-400, Brazil.
5. Department of Chemistry, University of Warsaw, Pasteura 1, PL-02-093 Warsaw, Poland.
6. Laboratory for Biological Geochemistry, School of Architecture, Civil and Environmental Engineering, Ecole Polytechnique Fédérale de Lausanne, and Center for Advanced Surface Analysis, Institute of Earth Sciences, Université de Lausanne, CH-1015 Lausanne, Switzerland.