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[EN] The uniqueness of a polished tool discovered from the Neolithic levels of the prehistoric site of Costamar (Castellón, Spain) raised a detailed analysis both the nature of the support, which has been identified as a sea shell concerning the species Spondylus gaederopus, as well as traces of use preserved at the edge that allows us to define the tool as an adze.[ES] La singularidad de un instrumento pulimentado recuperada en los niveles neolíticos del yacimiento de Costamar (Castellón) suscitó un análisis detallado tanto de la naturaleza del soporte, que se ha identificado como concha marina correspondiente a la especie Spondylus gaederopus, como de los rastros de uso conservados en la zona activa, que permiten redefinir el útil como una azuela.Peer reviewe

El uso de conchas marinas como soporte de útiles pulimentados: una pieza recuperada en Costamar (Castellón)