1. Tie-Point, Geoscience Limited, Rhiw Goch, Llanfihangel GM, Corwen, Conwy, LL21 9UG, United Kingdom
2. Petroleum Laboratories, Research & Studies (PLRS) Ministry of Petroleum and Gas, Khartoum, Republic of Sudan
3. Department of Geosciences, Universiti Teknologi PETRONAS, Bandar Seri Iskandar, Tronoh 31750, Perak, Malaysia
4. Department of Applied Geology, Western Australian School of Mines, Curtin University, GPO Box U1987, Perth, WA 6845, Australia; Department of Earth Sciences, University of Cambridge, Downing Street, Cambridge, CB2 3EQ, UK; School of Earth and Environment (M004), The University of Western Australia, 35 Stirling Highway, Crawley, WA 6009, Australia
5. Institut fur Angewadte Geowissenschaften Technische Universitat Berlin ekr. EB 10, Strasse des 17 Juni 145 D-10623 Berlin, Germany