About the Authors

Dawid Surmik

dawid@surmik.pl

Affiliations Faculty of Earth Science, University of Silesia, Będzińska 60, 41–200, Sosnowiec, Poland, Park of Science & Human Evolution, 1 Maja 10, 46–040, Krasiejów, Poland

Andrzej Boczarowski

Affiliations Faculty of Earth Science, University of Silesia, Będzińska 60, 41–200, Sosnowiec, Poland, Park of Science & Human Evolution, 1 Maja 10, 46–040, Krasiejów, Poland

Katarzyna Balin

Affiliations A. Chełkowski Institute of Physics, University of Silesia, Uniwersytecka 4, 40–007, Katowice, Poland, Silesian Centre for Education and Interdisciplinary Research, 75 Pułku Piechoty 1A, 41–500, Chorzow, Poland

Mateusz Dulski

Affiliations Silesian Centre for Education and Interdisciplinary Research, 75 Pułku Piechoty 1A, 41–500, Chorzow, Poland, Institute of Material Science, University of Silesia, 75 Pułku Piechoty 1A, 41–500, Chorzow, Poland

Jacek Szade

Affiliations A. Chełkowski Institute of Physics, University of Silesia, Uniwersytecka 4, 40–007, Katowice, Poland, Silesian Centre for Education and Interdisciplinary Research, 75 Pułku Piechoty 1A, 41–500, Chorzow, Poland

Barbara Kremer

Affiliation Institute of Paleobiology, Polish Academy of Science, Twarda 51/55, 00–818, Warszawa, Poland

Roman Pawlicki

Affiliation Department of Histology, Jagiellonian University Medical College, Kopernika 7, 31–034, Kraków, Poland

Competing Interests

The authors have declared that no competing interests exist.

Author Contributions

Conceived and designed the experiments: DS. Performed the experiments: DS AB RP KB MD JS. Analyzed the data: DS AB RP KB MD JS BK. Contributed reagents/materials/analysis tools: DS AB KB MD BK RP JS. Wrote the paper: DS AB KB MD BK JS. Designed the software used in analysis: DS AB KB MD JS. Experimental part made by: MD (FTIR) KB (ToF-SIMS) JS (XPS) DS AB RP (LM, ESEM).