1. Paleomagnetic Laboratory “Fort Hoofddijk,” Faculty of Geosciences; Utrecht University; Utrecht Netherlands
2. Research School of Earth Sciences, Australian National University; Canberra Australia
3. HGIP, University of Hawaii at Manoa; Honolulu Hawaii USA
4. Department of Geography and Geology; Sam Houston State University; Huntsville Texas USA
5. School of Geosciences, University of Edinburgh; Edinburg UK
6. Now at ERC; Brussels Belgium