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

[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.