Abstract
Fossiliferous Quaternary sedimentary beds in the Santa Lucía Basin (southern Uruguay) are potentially useful for the study of the last occurrences of extinct taxa, as well as the environmental and climatic patterns in the late Pleistocene to the early Holocene. They have provided a chronological framework (AMS 14C and Optically Stimulated Luminescence dates), a mammalian diversity and interpretations of last occurrence, the climatic-environmental setting, and some associated biogeographic processes. The ages produced encompass the last 30 to 7 ka interval (latest Pleistocene-early Holocene). The mammalian assemblage (36 genera, 24 species) includes typical South American late Pleistocene mammals, extinct species of extant genera, and some extant species that still exist elsewhere on the continent. The preservation pattern includes articulated and semi-articulated skeletons of large and small mammals. The presence in the southern Uruguayan Pampean area of some mammals currently inhabiting Patagonia, northwest and central Argentina (Dolichotis, Galea, Microcavia, Chaetophractus, Lagostomus, and Vicugna) is explained by the predominance of open areas and cold climates associated with the Last Glacial Maximum. The mammalian record depicts local extinctions or shifting ranges occurring in latest Pleistocene or early Holocene. The sedimentary chronological framework and taphonomic features suggest the persistence into the early Holocene of Eutatus seguini, Morenelaphus brachyceros, Equus neogeus, Hemiauchenia sp., Lama sp., and Vicugna sp. Glyptodon and Glossotherium seem to persist at least to the latest Pleistocene. This pattern can substantiate the hypothesis that some megafauna and large mammals persisted for some millennia alongside people with extinction occurring before, during, and after human colonization.
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Abbreviations
- AA:
-
NSF-Arizona AMS Laboratory, USA
- AMS:
-
Accelerator Mass Spectrometry
- BETA:
-
Beta Analytic: radiocarbon dating, Miami AMS lab, USA
- LP:
-
LATYR Laboratorio de Radiocarbono, Centro de Investigaciones Geológicas, La Plata, Argentina
- OSL:
-
Optically Stimulated Luminescence
- UIC:
-
Luminescence Dating Research Laboratory of the University of Illinois, USA
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Acknowledgements
We thank Andrés Sánchez and Federico López Romanelli for providing useful information based on collections; Alejandra Rojas for useful references; Rafael Suárez and Ugo Meneghin for archaeological and radiocarbon information. Editor-in-Chief John Wible, Diego Brandoni and two anonymous referees helped us to improve the manuscript. Contribution to the project Fondo Clemente Estable −2009-2398 and Comisión Sectorial de Investigación Científica CSIC-211-348.
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Ubilla, M., Rinderknecht, A., Corona, A. et al. Mammals in Last 30 to 7 ka Interval (Late Pleistocene-Early Holocene) in Southern Uruguay (Santa Lucía River Basin): Last Occurrences, Climate, and Biogeography. J Mammal Evol 25, 291–300 (2018). https://doi.org/10.1007/s10914-017-9380-2
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DOI: https://doi.org/10.1007/s10914-017-9380-2