1. Department für Geodynamik und Sedimentologie; Universität Wien; 1090 Wien Austria
2. Shell Petroleum Development Company of Nigeria; Port Harcourt Nigeria
3. Institut für Geologie; Universität Hamburg; Bundesstraße 55 20146 Hamburg Germany
4. School of Earth and Environment; University of Leeds; Leeds LS2 9JT UK
5. Geology Department; Faculty of Science; Tanta University; 31527 Tanta Egypt
6. Department of Geology; Faculty of Sciences Semlalia; Cadi Ayyad University; Marrakech Morocco
7. Lyell Centre; Heriot-Watt University; Edinburgh EH14 4AS UK