OSL and FTIR -VIS Spectroscopy Analysis of Mammal-Bearing Pleistocene Deposits

In the present work, Pleistocene records of fluvial deposition, with megafauna bones fossils, are dated with optically stimulated luminescence (OSL) method using single aliquots of quartz and SAR protocol. The basal fluvial samples supplied a precise OSL ages in an interval of 15.7 ka to 19.6 ka, which can be related to Last Glacial Maximum. FTIR-VIS spectroscopy experiments were made to determine the rates between hematite (Hm) and goethite (Gt), (Hm/(Hm+Gt). The obtained rates ranging from 0.06 to 0.24 were indicating wetter and cooler climatic conditions, in agreement with OSL ages and with megafauna extinction time.