Archaeologists have unearthed thousands of stone implements dating back about 40,000 to 70,000 years in north China's Inner Mongolia Autonomous Region.
Archaeologists from the Chinese Academy of Sciences and the Erdos Bronzeware Museum started excavating an area in the basin of the Ulan Mulun River in April, discovering more than 4,200 stone implements, including stone flakes, saw-shaped tools and remnant stones, according to Hou Yamei, the leader of the excavation team.
The river is a seasonal river near the city of Erdos and is believed to have been a primary location for stone tool production in ancient times, Hou said.
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