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1 - Department of Geosciences,
2 - Department of Physics, University of Arizona, Tucson, Arizona 85721, USA
3 - Research Laboratory for Archaeology and History of Art, University of Oxford, Oxford, OX1 3QJ, UK
4 - Institut für Mittelenergiephysik, ETH-Hönggerberg, CH-8093 Zürich, Switzerland
5 - Lamont-Doherty Geological Observatory, Columbia University, Palisades, New York 10964, USA
6 - Research Laboratory, British Museum, London WC1B 3DG, UK