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One of the most abundant species of bivalves found on modern beaches and Quaternary deposits in the San Matías Gulf (Argentinian Patagonia, SW Atlantic Ocean) is Glycymeris longior. Its high abundance and broad geographical distribution turn G. longior into a target species for taphonomical studies. Here, we described the taphonomic signature registered on its shells from San Antonio Bay (San Matías Gulf, Río Negro). This study will contribute to future taphonomic comparisons in the SW Atlantic Ocean, as well as in other Quaternary deposits, and provide insight into the spatial variation of the taphonomic processes influenced by the environment. Glycymeris longior valves from the Holocene Punta Delgado deposits showed two taphonomic signatures whose shell assemblages were differentiated by fragmentation, rounding and cementation intensities. Shells from PD2018A and PD2018B (two sampling localities representing similar environments) were subject to continuous and low-energy water flow. Those remained in a low-intensity hydrodynamic sediment-water interface that would favor high shell cementation. On the other hand, shells from PD2016 were also subject to continuous but more energetic water flow. Those would remain in the taphonomic active zone for enough time to confer smooth edges and to be colonized by clionid sponges but not favorable enough for carbonate precipitation. The Punta Delgado site was interpreted as a protected area during the Holocene (last 4200 yrs.), similar to the modern one, but with differences in carbonate precipitation as the product of differences in water flow intensities. Finally, the high mechanical resistance of G. longior shells, together with its abundance and broad geographical distribution, turn this species into a suitable target taxon for further taphonomic and ecologic analyses and comparisons. [ABSTRACT FROM AUTHOR]

The results of the study carried out on cauquén -goose- (Chloephaga sp.) bone remains recovered from the open-air archaeological site of Laguna Las Vegas, middle basin of the Coyle River (Santa Cruz), are presented. We evaluate our findings in the light of supra-regional, regional and local archaeological and taphonomic information. The frequency of remains (NISP= 23), together with age patterning in skeletal parts displaying evidence for consumption (four adults and two juveniles), suggest that the cauquén would have been obtained near the site during the reproductive season, and that the parts with the highest economic yield were subsequently transported to the site together with the associated anatomical units. New radiocarbon dating of one cauquén bone plus another on a guanaco bone (Lama guanicoe) suggest approximate contemporaneity of the archaeological materials at the site, which date to around 3200 years BP. [ABSTRACT FROM AUTHOR]

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