A 4,000-year-old Zhukaigou cultural site was discovered in Inner Mongolia

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Stone knives excavated from the Sharitara site (file photo). Xinhua News Agency (Courtesy of Inner Mongolia Autonomous Region Institute of Cultural Relics and Archaeology)

Bone artifacts excavated from the Sharitara site (file photo). Xinhua News Agency (Courtesy of Inner Mongolia Autonomous Region Institute of Cultural Relics and Archaeology)

Pottery pigs excavated from the Sharitara site (file photo). Xinhua News Agency (Courtesy of Inner Mongolia Autonomous Region Institute of Cultural Relics and Archaeology)