About the Authors

Olev Vinn

olev.vinn@ut.ee

Affiliation Department of Geology, University of Tartu, Tartu, Estonia

Mari-Ann Mõtus

Affiliation Institute of Geology at Tallinn University of Technology, Tallinn, Estonia

Competing Interests

The authors have declared that no competing interests exist.

Author Contributions

Conceived and designed the experiments: OV MAM. Performed the experiments: OV MAM. Analyzed the data: OV MAM. Contributed reagents/materials/analysis tools: OV MAM. Wrote the paper: OV MAM.