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4793 - Morphometric evolution of bifacial points in Southeastern Brazil: Geographic and temporal trends

Mercedes Okumura (presenter) and Astolfo Gomes de Mello Araujo (co-author)

Museum of Archaeology and Ethnology, University of São Paulo , Brazil

It has been proposed that the Umbu tradition, whose definition is based on the presence of bifacial points, originated in Southeastern Brazil around 10,000 BP, and it could be still observed around 1,500 BP. This extended chronological frame has resulted in much disagreement about the actual existence of such a tradition. We aim to clarify questions related to the characterization of that tradition, the changes in the size and shape of these bifacial points through time, and the chrono-spatial relationship among point groups. We analyzed hundreds of bifacial points from four Brazilian states ( São Paulo , Paraná, Santa Catarina and Rio Grande do Sul), including material from the early to the late Holocene. Broken and not finalized points were not included. Semilandmarks were digitized using TPSDig2 and transformed in morphological coordinates using Procrustes method. Geometric morphometric analyses were carried out using TPSRegr, TPSSmall, TPSUtil and TPSPls. Results based on the geometric morphometric analyses are presented and the geographic and temporal trends are discussed.

Keywords: geometric morphometrics, archaeostatistics, Umbu tradition

Author: Mercedes, Okumura (Museum of Archaeology and Ethnology, University of São Paulo, Brazil / Brasilien)

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