Abstract
This article presents a part of conclusions of a research concerning the Mytilus edulis shells coming from a shellmidden or “conchales” of Imiwaia I site on the edges of the Beagle channel in Argentina. Our main objective was to bring further information on the method of preparation of bivalves by canoe hunter-gatherer-fishers for their alimentation (~6400 BP). The project concentrated on the comparative analysis of modern M. edulis valves collected in the region and opened by various methods, and those excavated from the archeological site Imiwaia I. The analysis of the inorganic structure of both layers of valves (calcite and aragonite) allowed to conclude on the opening technique employed and the parameters of preservation offered by the shellmidden. During the development of the study, we worked from a multidisciplinary approach of historical, ethnographical, archaeological and chemical information to better understand and interpret the opening methodology of bivalves and their effect on the state of preservation of the information carried by the archaeological specimens.
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