1. Natural History Museum Geneva, Route de Malagnou 1; CP 6434 1205 Geneva 6 Switzerland
2. Natural History Museum Bern; Bernastrasse 15 3005 Bern Switzerland
3. Western Australian Argon Isotope Facility; Department of Applied Geology and JdL Centre; Curtin University; GPO Box U1987 Perth Western Australia 6845 Australia
4. Saudi Geological Survey; P.O. Box 54141 Jeddah 21514 Kingdom of Saudi Arabia
5. Institute of Geological Sciences; University of Bern; Baltzerstrasse 1+3 3012 Bern Switzerland
6. Department of Geology; Lund University; Sölvegatan 12 223 62 Lund Sweden