The geographic location of the site, the largest of this kind in northern Guipúzcoa, is detailed. The large number of pieces (silex tools and chips) found mostly on the surface of eroded areas indicates an advanced stage of development. Neither animal remains nor bone implements were found. The stone tools, including burins and scrapers, are described and analyzed, and results of analyses reported. Their technique of manufacture is not found to be of a high caliber, but ready availability of the raw material might explain the abundance of this production. The study of the objects and of the chips, as well as examinations of the family and social structures using the Laplace technique and their cumulative curves suggest that this could be a Middle Magdalenian habitat, or more probably Final Cantabric (16000 to 13000 BC). Analyses of samples point to extreme heteromorphism of production. -- AATA