Osseous harpoon heads of hunter-gatherers from the lower Paraná wetland

Abstract

Harpoons are part of the composite technologies, widely dispersed throughout the world. In South America, a unique type of throwing harpoon reveals a limited distribution, primarily discovered in hunter-gatherer archaeological sites within the lower La Plata basin. Specifically, they are found in two archaeological units named Incised Pottery and Plain Pottery which are defined by different material properties but share several common aspects as well. Regarding bone tools, the primary distinction lies in the decoration of the items, contrasting with the ornamentation of the pottery. While the processes underlying regional variability in the archaeological assemblages is not yet fully understood, various types of artifacts show differences in morphology and stylistic features that can be linked to archaeological units. For this purpose, we examined 13 archaeological samples of harpoon heads considering morphological, physical, and metrical variation, as well as the operational sequence. As result, we observed variations in both morphology and decoration, while the metrical structure, the selection of raw material and the operational sequence remain unaltered. This phenomenon could be attributed to a recent process of social differentiation affecting external features, whereas the internal characteristics are connected to technique behaviors resistant to recent changes.