[1] Univ Basel, IPAS, Dept Environm Sci, CH-4055 Basel, Switzerland
[2] Regierungsprasidium Stuttgart, Landesamt Denkmalpflege, Hemmenhofen, Germany
[3] Goethe Univ Frankfurt, Lab Archaeobot, Inst Archaeol Sci, Dep Prehist 3, Frankfurt, Germany
[4] Univ Franche Comte, UFR Sci & Tech, CNRS, UMR 6249, F-25030 Besancon, France