About the Authors

Jean Vannier

jean.vannier@univ-lyon1.fr

Affiliation Laboratoire de géologie de Lyon: Terre, Planètes, Environnement, Université de Lyon, Université Lyon 1, Villeurbanne, France

Competing Interests

The author has declared that no competing interests exist.

Author Contributions

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