1. Paleomagnetic Laboratory “Fort Hoofddijk,” Department of Earth SciencesUtrecht University Utrecht Netherlands
2. Research School of Earth SciencesAustralian National University Canberra ACT Australia
3. Department of Earth and Environmental SciencesLudwig‐Maximilians‐University Munich Munich Germany
4. Research School of ChemistryAustralian National University Canberra ACT Australia