The museum is really well laid out, and the artefacts speak for themselves, but it seems that not much is known for sure about the SanXingDui era.

The mask and other displayed items, including jade knives, were some of the objects apparently used in rituals of human sacrifice.
Birds were important symbols to this ancient culture as well, perhaps because birds could move freely between the earth and the heavens. A few examples:-





SanXingDui Museum - near Chengdu - well worth a visit !