A piece of pottery from the Eastern Zhou Dynasty (770-256 BC) is unearthed in Daishan. [Photo/WeChat account: zjzsrbs]

More than 20 ancient ruins were discovered in Daishan, a county in Zhoushan, East China's Zhejiang province, during a recent archaeological survey.

The ruins spans from the prehistoric era to Song Dynasty (960-1279).

Cultural relics unearthed in Daishan. [Photo/WeChat account: zjzsrbs]

The prehistorical ruins blend in with croplands and some relics unearthed from these sites are similar to the Huangjiatai ruins in Shengsi county, but some of them are completely unique among Zhoushan ruins, according to Zhu Xuefei, a staff member of the Zhejiang Provincial Institute of Cultural Relics and Archaeology.

Previously, only four ancient ruins had been discovered in Daishan, and the newly-discovered ruins are important to archaeological research in Zhoushan, noted Zhu.