1. ENS de Lyon, CNRS, UMR 5276, LGL-TPE, Université Claude Bernard (Lyon I), Lyon, France
2. Evolutionary Studies Institute, University of the Witwatersrand, Johannesburg, South Africa
3. School of Geosciences, University of the Witwatersrand, Johannesburg, South Africa
4. Department of Earth Sciences, Natural History Museum, London, United Kingdom
5. European Synchrotron Radiation Facility, Grenoble, France