But inspection of the broken mastodon bones, and large stones lying with them, point to a radical new date for the arrival of ancient humans. Unlike the wolf and horse bones found in other layers at the site, the ends of some of the mastodon bones had been broken off, as if to extract nutritious bone marrow. Photograph: San Diego Natural History MuseumMost remarkable of all is the apparent age of the bones. Photograph: Tom Deméré, San Diego Natural History MuseumThe usual assumption is that humans came to America from eastern Asia across the Bering strait. Photograph: Tom Deméré, San Diego Natural History MuseumIt will take more evidence to convince many scientists, however.

Source: The Guardian April 26, 2017 16:52 UTC