In 1985, Shandong government departments responsible for cultural relics sent staff to Yuan-cheng to conduct a general survey of relics there. In Dinggong Village they discovered large quantities of important relics in the form of artifacts made of bone, clam shells, pottery, and stone. They provisionally classed the area as a neolithic site of the "Longshan" culture.
一九八五年，山東省文物單位到苑城鄉作文物普查，在丁公村發現大量的骨器、蚌器、陶器、石器等重要文物，初步判定此地為新石器時期的「龍山文化」遺址。