Highest altitude archaeological sites in the world explored in the Peruvian Andes: Survival in extreme environments -- ScienceDaily - http://www.sciencedaily.com/release...
"Research conducted at the highest-altitude Pleistocene archaeological sites yet identified in the world sheds new light on the capacity of humans to survive in extreme environments. The findings were taken from sites in the Pucuncho Basin, located in the Southern Peruvian Andes." - Maitani
"The primary site, Cuncaicha is a rock shelter at 4,480 metres above sea level, with a stone-tool workshop below it. There is also a Pucuncho workshop site where stone tools were made at 4,355 metres above sea level. Climatic conditions in both sites are harsh, with factors including low-oxygen, extreme cold and high levels of solar radiation making life in the region a challenge for any humans. And yet, the findings indicate that people were living in these high altitude zones for extended periods of time. Cuncaicha was occupied about 12.4 to 11.5 thousand years ago while the Pucuncho workshop site dates to around 12.8 to 11.5 thousand years ago." - Maitani