1. Department of Earth Sciences, Uppsala University, Villavägen 16, Uppsala SE-752 36, Sweden
2. Department of Geological Sciences, Stockholm University, Svante Arrhenius väg 8, Stockholm 114 18, Sweden
3. School of Geosciences, University of Edinburgh, West Mains Road, Edinburgh EH9 3JW, UK
4. Department of Earth Sciences, Durham University, South Road, Durham DH1 3LE, UK
5. School of Earth and Environmetal Sciences, University of St, Andrews, St, Andrews KY16 9AL, UK
6. Service Géologique de Luxembourg, Ministère de la Mobilité et des Travaux Publics, 23, Rue du Chemin de Fer, Bertrange L-8057, Luxembourg
7. CEED, University of Oslo, Sem Sælands vei 2A, ZEB-bygget, Oslo 0371, Norway