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2 February 2015
Ancient bone hand ax identified in China

Researchers say they have identified the first example of a bone - not stone - hand ax crafted by ancient humans in East Asia. Makers of the curved, pear-shaped implement probably used it to dig up edible roots in a densely vegetated part of South China around 170,000 years ago, say paleontologist Guangbiao Wei of China Three Gorges Museum in Chongqing and his colleagues.
     Part of a lower jaw from a stegodon, a now-extinct, elephant-like creature, provided raw material for the tool, the researchers report in Quaternary International. The jaw includes a wide, thick piece of curved bone with a grip-ready indentation on its inner surface, the scientists say.
     Excavation of a Chinese cave in 2002 yielded the hand ax, along with bones of stegodons and other large animals. Until now, though, the artifact's age was unknown. Wei's team dated the find by measuring the decay rate of forms of uranium and thorium in the fossilized bone.
     Bone hand axes are rare, even outside East Asia. A handful of such tools previously unearthed in Africa, Europe and West Asia were made from limb bones, ribs and tusks of creatures such as mammoths. Stone hand axes, which preserve far better than bone artifacts, are more numerous and date to 800,000 years ago in South China.

Edited from ScienceNews (14 January 2015)

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