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LUMINESCENCE DATING OF LATE PLEISTOCENE AND HOLOCENE SEDIMENTS IN URUGUAY

Published online by Cambridge University Press:  26 April 2018

James K. Feathers  and
Hugo G. Nami
James K. Feathers*
Affiliation:
Luminescence Dating Laboratory, Box 353412, University of Washington, Seattle, Washington, USA
Hugo G. Nami
Affiliation:
CONICET-INGEODAV, Department of Geological Sciences, Facultad de Ciencias Exactas, Físicas y Naturales (UBA), Ciudad Universitaria, Pabellón II, Buenos Aires (C1428EHA), República Argentina, and associated researcher Department of Anthropology, National Museum of Natural History, Smithsonian Institution, Washington DC, USA
*
([email protected], corresponding author)
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Abstract

The archaeological record in the Negro River in central Uruguay Republic is remarkable for its richness, including the presence of a significant number of Paleoindian fishtail points. As part of ongoing research on the earliest human occupations in this region, luminescence dating is applied to develop a terminal Pleistocene-Holocene regional chronology. Eight ages were derived from six samples taken from sedimentary fluvial deposits from two sites near the city of Paso de los Toros. The resulting dates span 11.8 and 1.04 ka corresponding to the Late Pleistocene and the whole Holocene. Because the chronology of the sedimentary sequences spanning these ages is poorly known, the presented results become a significant contribution to the construction of a chronostratigraphy sequence in the area. The results also show how single-grain dating can distinguish different components of mixed assemblages.

El registro arqueológico del Río Negro, en el centro de la República del Uruguay, destaca por su riqueza, incluyendo la presencia de un número significativo de puntas de proyectil Paleoindias del tipo “Cola de Pescado”. Como parte de las investigaciones en curso sobre las ocupaciones humanas más tempranas de la región, se aplicó la datación por luminiscencia para desarrollar una cronología regional de la transición entre Pleistoceno tardío y Holoceno. Se derivaron ocho fechas de seis muestras tomadas en depósitos sedimentarios fluviales cerca de la ciudad de Paso de los Toros. El intervalo de las edades obtenidas es de entre 11,8 y 1,04 ka, lo que corresponde al Pleistoceno tardío y todo el Holoceno. Debido a que la cronología de las secuencias sedimentarias que abarcan estas edades es poco conocida, los resultados presentados constituyen una contribución significativa para el desarrollo de una secuencia crono-estratigráfica en el área. Los resultados también muestran cómo la datación de grano único puede distinguir componentes diferentes de conjuntos mixtos.

Type
Article
Information
Latin American Antiquity , Volume 29 , Issue 3 , September 2018 , pp. 495 - 513
Copyright
Copyright © 2018 by the Society for American Archaeology 

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