Stone tool, Galeria. It is thought that Galeria acted as a natural trap and that humans and carnivourous animals came to it to eat the meat of the animals that had fallen in. The humans left behind stone tools during their visits, which were recovered after excavations started in 1982. The fossils and stone tools at Galeria date back to between 250,000 and 400,000 years. Galeria is one of several sites in Sierra de Atapuerca, Spain, that have been studied on and off over the past century, leading to a massive advancement in the understanding of human evolution. In 2000, Sierra de Atapuerca was made a world heritage site by UNESCO.
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