File photo shows a piece of pottery found in the Peiligang cultural site in Xinzheng, central China's Henan Province.Photo:Xinhua
File photo shows an ancient tomb found in the Peiligang cultural site in Xinzheng, central China's Henan Province.Photo:Xinhua
File photo shows a piece of pottery found in the Peiligang cultural site in Xinzheng, central China's Henan Province.Photo:Xinhua
File photo shows clay pots found in the Peiligang cultural site in Xinzheng, central China's Henan Province.Photo:Xinhua