The absence of a city wall in Jinsha is particularly strange, because cities in ancient China emerged as concentrations of political power, not trading centers as was mostly the case in the west.
Researchers also know little about the ties the Sanxingdui and Jinsha people had with other cultures, even if they can determine that exchanges must have been frequent.
The archeological teams have uncovered large numbers of ivory tusks originating from China's current border with mainland Southeast Asia.
The question is, how did they get here, and why?
Other questions remain. Where did the Sanxingdui and Jinsha people come from? Where did they go? And what exactly characterized their religion?
These are questions that may never be answered, because the Sanxingdui people left no written record. It is odd that people at their stage of development did not invent some type of writing system, but it is not unheard of.
Other civilizations, most notably in pre-Columbian America, were also illiterate, even as they were highly advanced in other fields such as architecture and astronomy.
Hidden knowledge
For Zhu, the museum historian, the discovery of written records would be a dream come true, unlocking hidden knowledge about how the mystical ancient inhabitants of the area lived and what their thoughts and feelings were.
"We don't know if they actually did invent writing. Maybe they did, but they used a material that has not survived to this day. It would be major, major step forward if we found written records," she says.
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