Archaeologists clean a Chuanguan tomb of the ancient Shu state in Pujiang county of Chengdu, capital of Southwest China's Sichuan province. [Photo/sichuan.scol.com.cn]

A newly discovered tomb complex, which dates back to the Warring States Period (475-221 BC), consists of 60 Chuanguan tombs and was found during excavation for the construction of a real estate project in Pujiang county, according to a press release of Chengdu Cultural Relics and Archeology Research Institute on Feb 8.

So far, a total of 47 tombs have been cleaned and more than 300 burial objects have been unearthed, including pottery, bronze wares, weapons and utensils for daily use.

Among the findings were 11 seals carved with ancient characters, and archaeologists said this may prove the ancient Shu state had its own writing system.