1. Department of Earth Sciences University of Toronto Toronto Ontario Canada
2. Département des Sciences de la Terre Université de Genève Geneva Switzerland
3. Department of Geology Grand Valley State University Allendale Michigan USA
4. Dipartimento di Scienze Biologiche, Geologiche e Ambientali Alma Mater Studiorum Università di Bologna Bologna Italy
5. Sorbonne Université, Museum National d'Histoire Naturelle, UMR CNRS 7590, IRD Institut de Minéralogie, des Physique de Matériaux et de Cosmochimie Paris France
6. Institute of Geosciences and Earth Resources National Research Council of Italy Pisa Italy
7. Department of Geology Augustana College Rock Island Illinois USA