subdivision of the last geological era of our planet - the Quaternary. It is subdivided by convention into three periods: the Lower Pleistocene (2.5 million – 700,000 years), the Middle Pleistocene (700,000 – 128,000 years) and the Upper Pleistocene (128,000 – 12,000 years BP). Its lower limit does not have a well-defined dating because of the absence of fossils, and it corresponds to the last interval of the Earth’s history, marked by consecutive glaciations. The evolution of Anatomical Modern Human occurred during this period (at approximately 150 000 years). Due to huge climatic variations, there are changes in the fauna and flora. Many extinction episodes occur, as is the case of the larger mammals (mammoths, mastodons, saber-tooth tigers, among others).