About the Authors

Katarzyna Frankowiak

Affiliation Institute of Paleobiology, Polish Academy of Sciences, Twarda 51/55, PL-00-818 Warsaw, Poland

Sławomir Kret

Affiliation Institute of Physics, Polish Academy of Sciences, Lotników 32/46, PL-02-668 Warsaw, Poland

Maciej Mazur

Affiliation Department of Chemistry, University of Warsaw, Pasteura 1, PL-02-093 Warsaw, Poland

Anders Meibom

Affiliations Laboratory for Biological Geochemistry, School of Architecture, Civil and Environmental Engineering, Ecole Polytechnique Fédérale de Lausanne (EPFL), CH-1015 Lausanne, Switzerland, Center for Advanced Surface Analysis, Institute of Earth Sciences, Université de Lausanne, CH-1015 Lausanne, Switzerland

Marcelo V. Kitahara

Affiliation Departamento de Cięncias do Mar, Universidade Federal de SăoPaulo, Campus Baixada Santista, 11030–400 Santos, Brasil

Jarosław Stolarski

stolacy@twarda.pan.pl

Affiliation Institute of Paleobiology, Polish Academy of Sciences, Twarda 51/55, PL-00-818 Warsaw, Poland

Competing Interests

The authors have declared that no competing interests exist.

Author Contributions

Conceived and designed the experiments: JS AM KF. Performed the experiments: JS AM KF. Analyzed the data: KF JS AM MM SK. Contributed reagents/materials/analysis tools: KF SK MM AM MVK JS. Wrote the paper: KF JS AM MM SK MVK.