Nueva información referida a la transición Pleistoceno-Holoceno y al Holoceno temprano en el extremo sur del Macizo del Deseado (Patagonia, Argentina)

This work presents new results obtained regarding early occupations at La Gruta 1 site, in the area of La Gruta, at the southern extreme of the Deseado Massif, Argentine Patagonia. These results encompass both the Pleistocene-Holocene transition and the Early Holocene and include paleoenvironmental information and new radiocarbon dates, as well as additional data on the availability and utilization of lithic raw materials. We present the results of the analysis of the lowest part of a wet meadow located in the Deseado Massif, close to the Viuda Quenzana archaeological locality. Its base is dated at ca. 12,500 years BP (14,500 cal BP). The results obtained allow us to infer the existence of vegetation similar to the one reconstructed for other sites of the area, suggesting the occurrence of more humid conditions during the second period of human occupation in La Gruta 1, dated between ca. 11,000 and 8000 cal BP Evidences obtained through broadening of the excavation show a lack of continuity between the samples dating from the Pleistocene-Holocene transition and those that correspond to the Early Holocene. Both periods present evidences of the transport of raw material from other zones into the area, including bifacial artifacts, which is consistent with human behavior during this time period.