An aerial drone photo taken on Dec. 8, 2025 shows part of the Zhaigou site in Qingjian County, northwest China's Shaanxi Province. The Zhaigou site, a settlement site dating back to about 3,200 years ago, was listed as one of the major field archaeological discoveries during the sixth Shanghai Archaeology Forum (SAF2025) in east China's Shanghai on Tuesday. (Xinhua/Li Yibo)

This photo taken on Dec. 8, 2025 shows a bronze yue axe unearthed from the Zhaigou site in Qingjian County, northwest China's Shaanxi Province. The Zhaigou site, a settlement site dating back to about 3,200 years ago, was listed as one of the major field archaeological discoveries during the sixth Shanghai Archaeology Forum (SAF2025) in east China's Shanghai on Tuesday. (Xinhua/Li Yibo)

An aerial drone photo taken on Dec. 9, 2025 shows part of the Zhaigou site in Qingjian County, northwest China's Shaanxi Province. The Zhaigou site, a settlement site dating back to about 3,200 years ago, was listed as one of the major field archaeological discoveries during the sixth Shanghai Archaeology Forum (SAF2025) in east China's Shanghai on Tuesday. (Xinhua/Li Yibo)

Researchers discuss the cleaning and restoration of a double-shaft chariot unearthed from the Zhaigou site at a laboratory of the Shaanxi Academy of Archaeology in Xi'an, northwest China's Shaanxi Province, Dec. 12, 2025. The Zhaigou site, a settlement site dating back to about 3,200 years ago, was listed as one of the major field archaeological discoveries during the sixth Shanghai Archaeology Forum (SAF2025) in east China's Shanghai on Tuesday. (Xinhua/Li Yibo)

This photo taken on Dec. 8, 2025 shows a carved ivory artifact unearthed from the Zhaigou site in Qingjian County, northwest China's Shaanxi Province. The Zhaigou site, a settlement site dating back to about 3,200 years ago, was listed as one of the major field archaeological discoveries during the sixth Shanghai Archaeology Forum (SAF2025) in east China's Shanghai on Tuesday. (Xinhua/Li Yibo)

A double-shaft chariot unearthed from the Zhaigou site is pictured at a laboratory of the Shaanxi Academy of Archaeology in Xi'an, northwest China's Shaanxi Province, Dec. 12, 2025. The Zhaigou site, a settlement site dating back to about 3,200 years ago, was listed as one of the major field archaeological discoveries during the sixth Shanghai Archaeology Forum (SAF2025) in east China's Shanghai on Tuesday. (Xinhua/Li Yibo)

An aerial drone photo taken on Dec. 8, 2025 shows part of the Zhaigou site in Qingjian County, northwest China's Shaanxi Province. The Zhaigou site, a settlement site dating back to about 3,200 years ago, was listed as one of the major field archaeological discoveries during the sixth Shanghai Archaeology Forum (SAF2025) in east China's Shanghai on Tuesday. (Xinhua/Li Yibo)