A view of an archaeological excavation at the Simagou ruins in Huade county, Northwest China's Inner Mongolia autonomous region. Bao Qingchuan, a researcher with the Inner Mongolia Autonomous Region Institute of Archaeology, said the remains have been radiocarbon dated to approximately 7000-9000 years ago. [Photo provided to China News Service]

Relics found during an archaeological excavation at the Simagou ruins in Huade county, Northwest China's Inner Mongolia autonomous region. Bao Qingchuan, a researcher with the Inner Mongolia Autonomous Region Institute of Archaeology, said the remains have been radiocarbon dated to approximately 7000-9000 years ago. [Photo provided to China News Service]

A view of an archaeological excavation at the Simagou ruins in Huade county, Northwest China's Inner Mongolia autonomous region. Bao Qingchuan, a researcher with the Inner Mongolia Autonomous Region Institute of Archaeology, said the remains have been radiocarbon dated to approximately 7000-9000 years ago. [Photo provided to China News Service]