This undated photo provided by the Shanxi provincial institute of archaeology shows bone tools unearthed from the Yuancun relics site dating back to the late period of the Yangshao Culture some 5,000 to 7,000 years ago at Yuancun village of Xiaxian county in Yuncheng city, North China's Shanxi province. TAIYUAN -- Archaeologists have excavated significant remains dating back to the …
