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ESR dating of Toxodon teeth from Baixa Grande, Bahia, Brazil

2021; Elsevier BV; Volume: 112; Linguagem: Inglês

10.1016/j.jsames.2021.103616

1873-0647

Ricardo da Costa Ribeiro, Ângela Kinoshita, Hermínio Ismael de Araújo‐Júnior, Ana Maria Graciano Figueiredo, Ismar de Souza Carvalho, Oswaldo Baffa,

Geology and Paleoclimatology Research

Although the extinct Quaternary megafauna is widely recorded in northeastern Brazil, geochronological studies carried out on its fossiliferous deposits are still scarce. In this study, Electron Spin Resonance (ESR) was applied to date 12 tooth fragments of Toxodon platensis (Mammalia, Notoungulata) collected in the tank deposit of Lago do Rumo, Baixa Grande, state of Bahia, Brazil. The results obtained in the geochronological analysis performed here reveal ages from around 60 ka to 34 ka for T. platensis in Lagoa do Rumo; and, considering the integration data in the paleontological literature, our results evidence the largest time-averaging ever recorded for tank deposits: around 51 thousand years.