Siberian Site Cedes Stone-Age Surprise

By Bower, B. | Science News, February 5, 1994 | Go to article overview

Siberian Site Cedes Stone-Age Surprise


Bower, B., Science News


On a windblown terrace above Siberia's Lena River, Russian scientists have unearthed evidence that humanity's evolutionary ancestors inhabited parts of northeastern Asia and could have made initial forays into North America much earlier than previously thought.

Preliminary soil analysis by two U.S. geologists indicates that stone tools found at the Siberian location, known as Diring, date to around 500,000 years ago. However, Russian investigators date the artifacts to at least 2 million years ago, argued excavation director Yuri A. Mochanov last week in a talk at the Smithson-fan Institution in Washington, D.C.

"I suspect the artifacts are younger than Mochanov's estimates," says Richard B. Potts, a Smithsonian archaeologist who examined a dozen stone flakes and blades brought from the site by Mochanov. "But even if Diring is only 50,000 years old, it's significantly older than any other human site in Siberia."

No other human sites in Siberia date to more than 35,000 years ago. This fuels the view that North America's initial settlers arrived no earlier than 20,000 years ago (SN: 6/9/90, p.360).

Mochanov, an archaeologist at the Russian Academy of Sciences in Yakutsk, accepted this theory until shortly after he started working at Diring in 1982. Geologists digging up soil samples along the Lena River found some human bones and alerted Mochanov. He and his coworkers then excavated several human burials dating to 10,000 years ago and the 35,000-year-old remains of mammoth hunters.

The investigators also found sharp-edged stones that looked like human tools. These flakes, choppers, and other implements had been sandblasted by Siberian winds. Only East African stone tools that date to between 1.8 million and 2.5 million years old resemble the Diring artifacts, Mochanov contends. The tool-bearing soil has yielded no bones, probably because they were destroyed by windblown sand, Ports says.

A larger scientific team returned to Diring in 1983. Annual fieldwork since then has yielded more than 4,000 stone tools over an area the size of four football fields, making Diring the largest Stone-Age dig in the world, according to Robson Bonnichsen, an archaeologist at Oregon State University in Corvallis, who visited the site in 1992. …

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