Photo provided by Guizhou Provincial Cultural Relics and Archaeology Research Institute shows a stone tool unearthed from the Zhaoguodong site in Gui'an New Area, southwest China's Guizhou Province. The Zhaoguodong site in Guizhou is included in the list of the top 10 archaeological discoveries of 2020 released on Tuesday by the National Cultural Heritage Administration. Photo: Xinhua

Photo provided by Guizhou Provincial Cultural Relics and Archaeology Research Institute shows stone tools unearthed from the Zhaoguodong site in Gui'an New Area, southwest China's Guizhou Province. The Zhaoguodong site in Guizhou is included in the list of the top 10 archaeological discoveries of 2020 released on Tuesday by the National Cultural Heritage Administration. Photo: Xinhua

A staff member introduces archaeological discoveries at Zhaoguodong site in Gui'an New District, southwest China's Guizhou Province, April 16, 2021. The Zhaoguodong site in Guizhou is included in the list of the top 10 archaeological discoveries of 2020 released on Tuesday by the National Cultural Heritage Administration. Photo: Xinhua

Photo taken on April 16, 2021 shows the Zhaoguodong site in Gui'an New District, southwest China's Guizhou Province. The Zhaoguodong site in Guizhou is included in the list of the top 10 archaeological discoveries of 2020 released on Tuesday by the National Cultural Heritage Administration. Photo: Xinhua