[1] Univ Freiburg, Inst Earth & Environm Sci, Albertstr 23B, D-79104 Freiburg, Germany
[2] Univ Bordeaux Montaigne, CNRS, UMR 5060, Maison Archeol,IRAMAT CRP2A, F-33607 Pessac, France
[3] Univ Rennes, CNRS, Geosci Rennes, UMR 6118, F-35000 Rennes, France
[4] Bulgarian Acad Sci, Natl Inst Archaeol Museum, 2, Saborna St, Sofia 1000, Bulgaria
[5] Aix Marseille Univ, Minist Culture, CNRS, LAMPEA UMR 7269,Maison Mediterraneenne Sci Homme, 5 Rue Chateau Horloge BP 647, F-13094 Aix En Provence, France
[6] Univ Bordeaux, CNRS, PACEA UMR5199, Allee Geoffroy St Hilaire,CS50023, Batiment B18, F-33615 Pessac, France
[7] Natl Inst Immovable Cultural Heritage, Alexander Stamboliyski Blvd 17, Sofia 1000, Bulgaria
[8] Toulouse Jean Jaures Univ, TRACES Lab, UMR5608, Maison Rech, 5 Allees Antonio Machado, F-31058 Toulouse 9, France