[1] Univ Oxford, Sch Archaeol, 1-2 South Parks Rd, Oxford OX1 3TG, England
[2] Vrije Univ Brussel, Dept Chem, AMGC WE VUB, Analyt Environm & Geochem, Pl Laan 2, B-1050 Brussels, Belgium
[3] Univ Libre Bruxelles, G Time Lab, CP 160-02,50 Ave FD Roosevelt, B-1050 Brussels, Belgium
[4] UCL, Inst Archaeol, 31-34 Gordon Sq, London WC1H 0PY, England
[5] Sorbonne Univ, Museum Natl Hist Nat, Ctr Natl Rech Sci, Unite Mixte Rech Archeozool Archeobot Soc Prat &, CP 56,55 Rue Buffon, F-75005 Paris, France