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The objective of this work is to reconstruct production sequences and use of woody raw materials among Patagonian hunter-gatherer groups. To this end, we studied small fragments of non-carbonized wood, pieces of wood with distinct types of technological features and formatized artefacts and/or wooden tools from two archaeological sites in south-central Argentine Patagonia. The taxonomic results showed the recurrent use of two taxa, Nothofagus pumilio and Berberis sp., among distinct occupations corresponding to both the early and late Holocene. The morphological and traceological results demonstrate the implementation of different technical operations such as the debarking and the roughing of the wood, as well as bevelled and perimeter cuts. They also show the recurrent presence of certain technological features and traces in woods and artefacts associated with distinct occupations in the Holocene. To sum up, the results reached reaffirm the existence of a selective practice of woody plant species to be used as raw material, and at the same time, the results reveal the existence of a sustained formatization over time and suggest the existence of production sequences related to the development of wood technology among Patagonian hunter-gatherer groups. [ABSTRACT FROM AUTHOR]

The Pueyrredón-Posadas-Salitroso lacustrine system (PPS-LS) is located in the Andean Patagonia region of Argentina (47°22′28″S – 71°55′34″W) and represents a series of lakes formed as glaciers retreated during the late Pleistocene and early Holocene. These lakes began as proglacial lakes and later evolved into periglacial lakes. This research presents the chronological evolution of the PPS-LS bathymetric variations based on the analysis of stratigraphic profiles surveyed at different locations and the dates obtained from lake sediments. Four paleogeographic sketches representing the chronological evolution of the PPS-LS between 23,580 BP and 5208 BP have been developed based on the integration of these data. [ABSTRACT FROM AUTHOR]

Abstract: Raptor pellets from Cerro Casa de Piedra archaeological sites, Patagonia, have yielded consistent evidence of parasitism and possible zoonoses in ancient times. Pellet samples analyzed were dated at 2740 ± 100 and 3.990 ± 80 years before present and have produced evidence of three intestinal parasite genera. Eggs of two nematodes Trichuris and Calodium, and one cestode, taeniid, were found. Its significance for rock shelters paleoepidemiology of the Holocene is discussed. This study increases the evidences that raptor pellets can be used as source of paleoparasitological information in archaeological sites. [Copyright &y& Elsevier]

Abstract: Coprolites attributable to humans, dated from the Pleistocene–Holocene transition, obtained from the archaeological site Cerro Casa de Piedra, Santa Cruz Province, were examined for parasites. The feces were processed by rehydration and spontaneous sedimentation using conventional parasitic procedures. Helminthic eggs recovered were identified as Trichuris sp., Calodium sp., other capilariids, and ancylostomid (Nematoda), probably Hymenolepis sp. and anoplocephalid (Cestoda); one oocyst attributable to Eimeria macusaniensis (Apicomplexa) was also found. According to the life-cycles and specificity of the parasites found, it is possible to suggest that some species (i.e., E. macusaniensis and Calodium sp.) represent parasites in transit or pseudoparasitism. Paleoparasitological results revealed the existence of an intensive relationship between parasites and humans in the Pleistocene–Holocene transition in Patagonia. Evidence suggests an early association among parasites, rock shelters and hunter–gatherers in the region. It is also postulated that the ancient lifestyles associated with caves and rock shelters were conductive to illness. [Copyright &y& Elsevier]