About the Authors

Madelaine Böhme

m.boehme@ifg.uni-tuebingen.de

Affiliations Department of Geosciences, Eberhard-Karls-University Tübingen, Germany, Senckenberg Centre for Human Evolution and Palaeoenvironment, Tübingen, Germany

Nikolai Spassov

Affiliation National Museum of Natural History, Bulgarian Academy of Sciences, Sofia, Bulgaria

Martin Ebner

Affiliation Department of Geosciences, Eberhard-Karls-University Tübingen, Germany

Denis Geraads

Affiliations CR2P (UMR 7207), Sorbonne Universités, Muséum National d'Histoire Naturelle, Centre National de la Recherche Scientifique, CP 38, Paris, France, Department of Human Evolution, Max Planck Institute for Evolutionary Anthropology, Deutscher Platz 6, Leipzig, Germany

Latinka Hristova

Affiliation National Museum of Natural History, Bulgarian Academy of Sciences, Sofia, Bulgaria

Uwe Kirscher

Current address: Earth Dynamics Research Group, Australian Research Council, Centre of Excellence for Core to Crust Fluid Systems and The Institute for Geoscience Research, Department of Applied Geology, Western Australian School of Mines, Curtin University, Perth, Australia

Affiliation Department of Earth and Environmental Sciences, Geophysics, Ludwig-Maximilians-University, Munich, Germany

Sabine Kötter

Affiliations Department of Geosciences, Eberhard-Karls-University Tübingen, Germany, Senckenberg Centre for Human Evolution and Palaeoenvironment, Tübingen, Germany

Ulf Linnemann

Affiliation Senckenberg Natural History Collections Dresden, Museum of Mineralogy and Geology, GeoPlasmaLab, Dresden, Germany

Jérôme Prieto

Affiliation Department of Earth and Environmental Sciences, Palaeontology, Ludwig-Maximilians-University, Munich, Germany

Socrates Roussiakis

Affiliation Faculty of Geology and Geoenvironment, National and Kapodistrian University of Athens, Greece

George Theodorou

Affiliation Faculty of Geology and Geoenvironment, National and Kapodistrian University of Athens, Greece

Gregor Uhlig

Affiliation Leibniz Institute of Polymer Research Dresden, Dresden, Germany

Michael Winklhofer

Affiliation School of Mathematics and Science, Institute of Biology and Environmental Science, University of Oldenburg, Germany

Competing Interests

The authors have declared that no competing interest exists, including the commercial funding source United Bulgarian Bank. This does not alter our adherence to PLOS ONE policies on sharing data and materials.

Author Contributions

Conceptualization: MB NS. Formal analysis: MW. Funding acquisition: MB NS GT MW. Investigation: MB NS ME DG LH UK SK UL JP SR GT GU MW. Methodology: MB MW. Project administration: MB. Supervision: MB. Validation: MB MW. Visualization: MB MW. Writing – original draft: MB MW UK NS DG LH SR. Writing – review & editing: MB MW.