Excavations at Gran Dolina. Archaeologist excavating a stone tool from level TD10 (upper section) of the Gran Dolina site. So far, more than 2000 objects have been recovered and the number is expected to increase. The objects and fossils from TD10 date back 400,000 years. Gran Dolina is one of several archaeological 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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