Radiocarbon trends in the Pampean region (Argentina). Biases and demographic patterns during the final Late Pleistocene and Holocene

MARTÍNEZ, GUSTAVO; PRATES, LUCIANO; FLENSBORG, GUSTAVO; STOESSEL, LUCIANA; ALCARÁZ, ANA P.; BAYALA, PABLO

QUATERNARY INTERNATIONAL

PERGAMON-ELSEVIER SCIENCE LTD

Lugar: Amsterdam; Año: 2015 vol. 356 p. 89 - 110

1040-6182

This paper compiles a database of radiocarbon dates of archaeological sites that are currently available for the Pampean region. Based on the probability distribution of radiocarbon dates from this database, major temporal trends are defined, taphonomic and scientific biases are evaluated, and their implications for demography are suggested. Results indicate a continuous archaeological signal between ca. 14500 and 100 cal yr BP. During the final Late Pleistocene and the Early Holocene, the archaeological signal is low in ca. 14500-12800 cal yr BP, and increases to a moderate and continuous signal in ca. 12800-7500 cal yr BP. The archaeological signal for the former lapse correspond to the early peopling of the region and would be related to the inhabiting and exploitation of key landforms (e.g., rock shelters, river valleys) and critical resources (e.g., lithic raw material, water). The low amount of available dates for the Middle Holocene (ca. 7400-3700 cal yr BP), and the associated archaeological signal would be due to the combination of various factors such as taphonomic biases, organization of prehistoric populations, and even a possible low population density. The obtained results -a low but continuous signal for this period- were discussed in the framework of the proposed models for the human occupation of the region suggesting that a hypothesis about population extinctions and disruptions processes could not be sustained. Finally, during the Late Holocene (from 3700-100 cal yr BP) human occupations are recorded in all the micro-regions. Regardless of biases, this signal is interpreted as an increase in demographic density at a regional level.