1. School of Archaeology, University of Oxford, 1 South Parks Road, Oxford OX1 3TG, UK.
2. Analytical, Environmental and Geo-Chemistry, Department of Chemistry, Vrije Universiteit Brussel, AMGC-WE-VUB, Pleinlaan 2, 1050 Brussels, Belgium.
3. G-Time Laboratory, DGES, Université Libre de Bruxelles (ULB), CP 160/02, 50, Avenue F.D. Roosevelt, B-1050 Brussels, Belgium.
4. Department of Archaeology and New Technologies, Arkikus, Pedro de Asúa 63, 01008 Vitoria-Gasteiz, Spain.
5. Department of Earth Sciences, Faculty of Geosciences, Utrecht University, Princetonlaan 8a, 3584 CB Utrecht, Netherlands.