By combining the study of comparative mythology with historical linguistics, physical anthropology, population genetics and archaeology Witzel is forced to take his dating not just to recognizable prehistoric periods, but to much earlier eras, when early humans could have carried an inherited story out of Africa, across continents and land bridges that achieved their present shape as the result of postglaciation climatic conditions. The dominant Laurasian mythology, which, Witzel argues, emerged around 40,000 BC, was to a great extent transmitted through the Eurasiatic superfamily of languages scattered across the Eurasian land mass that included among its affiliations Indo-European, Dravidian, Uralic, Altaic, Kartvelian, and Afro-Asiatic.