The Sierra de Atapuerca sites provide unique testimony of the origin and evolution both of the existing human civilization and of other cultures that have disappeared. The evolutionary line or lines from the African ancestors of modern humankind are documented in these sites. The earliest and most abundant evidence of humankind in Europe is to be found in the Sierra de Atapuerca. The sites constitute an exceptional example of continuous human occupation, due to their special ecosystems and their geographical location. The fossil remains in the Sierra de Atapuerca are an invaluable reserve of information about the physical nature and the way of life of the earliest human communities in Europe.
The Pleistocene epoch of the Quaternary period is dated to 2.4 million to c 10,000 BP (Note Early dates resulting from scientific dating techniques are expressed as "years BP" - ie years before the conventional date of 1950 on which all radiocarbon dating is based.) The earliest fossil hominid remains in Europe, from c 800,000 BP as established by palaeomagnetic analysis, were found in the Gran Dolina site in the Sierra de Atapuerca, one of the Trinchera del Ferrocarril group. They are associated with simple stone tools of the Pre-Acheulean (Mode I) type, which is consistent with the dating of the earliest levels of this site. Also in the Trinchera del Ferrocarril group of sites are those known as Tres Simas. The oldest human remains from the Galería site have been dated to between 200,000 and 400,000 BP, associated with Acheulean (Mode II) stone tools.
Similar dates have been established for human skeletal remains from the Sima de los Huesos in the Cueva Mayor. The absence of herbivores consumed by humans in this site, where the remains of no fewer than 32 humans have been discovered, suggests that this may have been a mortuary site. If so, it is the earliest yet recorded. The relatively large sample, largely of adolescents and young adults, has permitted a number of important studies to be carried out on the palaeopathology of this population, the growth and development of individuals, and their average size.
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