In the central excavating area, where some sacrificial objects like ivory ware and jade ware were found, archaeologists unearthed 19 divining shells, all of which were made of the ventral and dorsal shells of tortoises. In every tortoise shell, there is a small burned hole. The largest tortoise shell found here is a 59-centimeter long ventral shell, which is also the biggest divining tortoise shell that has ever been found. These shells represent the supreme power of the rulers of the ancient Shu State. Archaeologists believe that these tortoise shells were used by sorcerers in ancient times when they made their divinations. Inscriptions have often been found on bones or tortoise shells in the Central Plains, but no inscriptions were found on these shells. The discovery of the tortoise shells here just matches with those that have been found in Chengdu before, and confirms the unique divining custom of the ancient Shu State culture.