Located in the Upper Awash Valley in Ethiopia, the serial property is a cluster of prehistoric sites that preserve archaeological and palaeontological records – including footprints – that testify to the area’s occupation by the hominin groups from two million years ago. The sites, situated about 2,000 to 2,200 metres above sea level, yielded Homo erectus, Homo heidelbergensis and archaic Homo sapiens fossils, documented in well-dated strata in association with various tools made from volcanic rocks. The cultural sequence includes four consecutive phases of the Oldowan, Acheulean, Middle Stone Age and Late Stone Age techno-complexes. Fragments of palaeo-landscapes, preserved buried under volcanic and sedimentary deposits with fossil fauna and flora, allow reconstruction of the high-mountain ecosystem of the Ethiopian Highlands during the Pleistocene. Conclusions can thus be drawn on the adaptation of hominin groups to the challenges and climatic conditions of high altitudes.

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