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I don't have sting ray in my collection but I find some photos on the internet and that's right, it looks like the bone on my photo. Many thanks for all your advices Cheers Déborah Déborah FRONTIN Doctorante Paris I Panthéon-Sorbonne Maison de l'Archéologie et de l'Ethnologie CNRS UMR 7041 - Equipe "Archéologies environnementales" 21 allée de l'Université - 92023 NANTERRE Cedex - FRANCE e.mail : [log in to unmask]