1. Department of Biological, Geological and Environmental Sciences University of Bologna Via Zamboni 67 40126 Bologna Italy
2. Department of Chemical and Geological Sciences University of Modena and Reggio Emilia Via Campi 103 41125 Modena Italy
3. ExxonMobil Development Company 22777 Springwoods Village Parkway Spring TX 77389 USA
4. KIGAM Korea Institute of Geoscience and Mineral Resources 92 Gwahangro, Yuseong‐gu Daejeon Metropolitan City Korea
5. Geologic Consultant Via Brizio 17/3 40134 Bologna Italy
6. ExxonMobil Upstream Research Company 22777 Springwoods Village Parkway Spring TX 77389 USA