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Resolution and the detection of cultural dispersals: development and application of spatiotemporal methods in Lowland South America

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  • Philip Riris

    (Bournemouth University)

  • Fabio Silva

    (Bournemouth University)

Abstract

Inferring episodes of expansion, admixture, diffusion, and/or migration in prehistory is undergoing a resurgence in macro-scale archaeological interpretation. In parallel to this renewed popularity, access to computational tools among archaeologists has seen the use of aggregated radiocarbon datasets for the study of dispersals also increasing. This paper advocates for developing reflexive practice in the application of radiocarbon dates to prehistoric dispersals, by reflecting on the qualities of the underlying data, particularly chronometric uncertainty, and framing dispersals explicitly in terms of hypothesis testing. This paper draws on cultural expansions within South America and employs two emblematic examples, the Arauquinoid and Tupiguarani traditions, to develop an analytical solution that not only incorporates chronometric uncertainty in bivariate regression but, importantly, tests whether the datasets provide statistically significant evidence for a dispersal process. The analysis, which the paper provides the means to replicate, identifies fundamental issues with resolution and data quality that impede identification of pre-Columbian cultural dispersals through simple spatial gradients of radiocarbon data. The results suggest that reflexivity must be fed back into theoretical frameworks of prehistoric mobility for the study of dispersals, in turn informing the construction of more critical statistical null models, and alternative models of cultural expansion should be formally considered alongside demographic models.

Suggested Citation

  • Philip Riris & Fabio Silva, 2021. "Resolution and the detection of cultural dispersals: development and application of spatiotemporal methods in Lowland South America," Palgrave Communications, Palgrave Macmillan, vol. 8(1), pages 1-13, December.
  • Handle: RePEc:pal:palcom:v:8:y:2021:i:1:d:10.1057_s41599-021-00717-w
    DOI: 10.1057/s41599-021-00717-w
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    References listed on IDEAS

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