Find suggests modern humans took earlier path out of Africa
Friday, January 28, 2011
For decades, the scientific consensus has held that anatomically modern humans first migrated out of Africa some 60,000 years ago, heading north into the eastern Mediterranean region and on to Europe and Asia.
But new research released Thursday paints a very different picture. Similarly identifiable humans left Africa as early as 125,000 years ago, it says, and wandered east into the Arabian Peninsula, parts of which were then wet and lush.
From there, the researchers report in a paper in the journal Science, the people who may well have been our true ancestors later headed north and on into Eurasia.
Hans-Peter Uerpmann of Germany's University of Tubingin said that the chiseled stone tools found by his team at Jebel Faya in the United Arab Emirates were very similar to those made at roughly the same time by early humans in East Africa.
The very early dating was done with new light-based technology that the research team said yields more precise results than in the past.
"These were our ancestors," Uerpmann said in a teleconference. "I don't see there's doubt about that."
The findings, based on a dig that went on from 2004 to 2010, are at odds with results from DNA testing and other archaeological finds that put the "out of Africa" migrations much later. Some excerpts in the field described the finding as very interesting but a hypothesis that needs more research.
The southern route out of East Africa proposed by the new research is also significantly different from the northern route across the Nile and into the Sinai that has been traditionally accepted as most likely.
Addressing those very different scenarios, Uerpmann said that their archaeological findings offer a new interpretation and that the advanced method of determining the age of the tools gives them great confidence in their results.
Team member Anthony Marks of Southern Methodist University, an anthropologist, said the tools were made in ways consistent with the 125,000-years-ago time period and therefore raise the inevitable question of how they got to the area near the Persian Gulf.
"Either these people came out of East Africa or they came from nowhere," he said.
The dig is being conducted about 40 miles from the Straits of Hormuz, the entry point into the Persian Gulf. The tools were found in a small limestone mountain range in the United Arab Emirates' Sharjah province.