Origins of Civilisation · Guanghan, Sichuan, China

Sanxingdui

A Bronze Age city outside every Chinese chronicle, whose pits disgorged golden masks and three-metre bronze beings with alien eyes.

Mainstream: City c. 1600–1100 BC; sacrificial pits c. 1300–1100 BCAlternative: Viral claims of extraterrestrial or lost-race origins; legends of the ancient Shu kings30.99°, 104.20°

Origins Technology Belief Myth

At a glance

In 1986 brick workers at Sanxingdui, near Guanghan on the Chengdu Plain, broke into two pits packed with deliberately burned and buried treasure: bronze heads with gold-foil faces, a 2.62-metre standing bronze figure, a 3.96-metre bronze 'spirit tree', elephant tusks and masks with eyes protruding on stalks. The finds belonged to a walled city of the Shu culture flourishing around 1600-1100 BC, contemporary with the Shang dynasty yet absent from all early Chinese texts and using no writing of its own. Excavations resumed spectacularly in 2020-2022, when six newly located pits yielded some 13,000 further artefacts, including a 280-gram gold mask, a bronze altar and a human-headed, snake-bodied hybrid.

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The mainstream view

What archaeology says

For Chinese and international archaeology, Sanxingdui is the flagship of the ancient Shu civilisation of the Sichuan basin and the strongest single argument that Chinese civilisation had multiple regional cradles rather than one Yellow River origin — the 'pluralistic unity' model now standard in Chinese scholarship. The walled city at Sanxingdui covered around 3.6 square kilometres, with monumental earth walls, sacrificial zones and elite craft production including bronze casting technology, related to, but stylistically utterly distinct from, Shang metropolitan work at Anyang.

The 2020-2022 campaign, led by the Sichuan Provincial Cultural Relics and Archaeology Research Institute with Ran Honglin directing the Sanxingdui work, applied laboratory-grade excavation — climate-controlled cabins, hazmat suits, on-site conservation — and recovered over 13,000 catalogued items from pits 3 to 8, among them the largest bronze mask ever found (1.31 metres wide), a bronze sacrificial altar, and gold and jade in profusion. Radiocarbon dates on the new pits centre on roughly 1200-1000 BC, and cross-pit joins between broken pieces show the pits were filled in a coordinated event or series of events.

The favoured interpretation is ritual termination: objects of a temple or state cult were smashed, burned and buried, perhaps amid political upheaval, flood, or the shift of power to the successor centre at Jinsha, near Chengdu, where closely related material continues to about 600 BC. The bulging-eyed masks are usually connected to Can Cong, the legendary first Shu king said in much later texts to have had protruding eyes.

Key evidence cited

Radiocarbon dating places the city c. 1600-1100 BC and the new pits c. 1200-1000 BC, contemporary with the Shang dynasty
Some 13,000 artefacts recovered from six new pits in 2020-2022 under laboratory conditions
Bronze alloy compositions and casting methods show shared technology with the Shang world despite unique styles
Cross-pit joins of broken objects demonstrate deliberate, coordinated ritual burial rather than catastrophe
Continuity of jade, gold and bronze traditions at the successor site of Jinsha links Sanxingdui to the later, historically recorded Shu kingdom
Silk residues found on artefacts in the new pits indicate advanced local textile ritual

The alternative view

What the skeptics propose

No major site in China generates more speculation. The unearthly faces — angular, huge-eyed, sometimes with eyeballs on ten-centimetre stalks — triggered a wave of 'Sanxingdui aliens' claims that went repeatedly viral on Chinese social media during the televised 2021 excavations, and have been a fixture of the Ancient Aliens franchise, with Giorgio Tsoukalos and fellow presenters proposing the bronzes commemorate extraterrestrial contact. The claims grew loud enough that excavation leaders, including Ran Honglin, publicly rebutted them, stating that every find sits within human craft traditions of the Bronze Age — an unusual case of field archaeologists formally answering the alien hypothesis.

A second strand of speculation is diffusionist: because Sanxingdui's gold masks, 'spirit trees' and staring figures look so unlike anything else in China, writers have proposed origins in, or contact with, Egypt, Mesopotamia or a lost Pacific culture. Some Chinese researchers have suggested more moderate versions — long-distance exchange of ideas along proto-Silk Road routes — which remain debated but not fringe.

There are also genuine mysteries the mainstream freely concedes: the total absence of writing at a site of palace-level complexity, the identity of the people, why the chronicles are silent about them, and what event ended the city around 1100 BC — recent work has argued for flood, warfare and exodus in various combinations. As Chinese archaeologists themselves like to say, Sanxingdui answers one question and raises ten.

Key evidence cited

Bronze faces with stalked eyes and gold masks unlike anything else in Bronze Age China, fuelling extraterrestrial claims aired on Ancient Aliens
No writing found despite state-level complexity, leaving the makers voiceless
The civilisation is absent from all early Chinese historical texts
Later legends describe the first Shu king Can Cong as having protruding eyes, read by some as a memory of non-human beings
Claimed stylistic parallels with Egyptian and Mesopotamian mask and tree imagery cited by diffusionist writers
The abrupt, unexplained destruction and burial of the entire cult assemblage around 1100 BC

Genuinely open questions

Who were the people of Sanxingdui, and what language did they speak?
Why did a society this complex leave no writing — or has it simply not been found?
What event led to the smashing, burning and burial of the pit assemblages?
What is the real meaning of the protruding-eyed masks and the bronze spirit trees?

Worth knowing

The 3.96-metre bronze 'sacred tree' from Pit 2, with nine birds on its branches, matches later Chinese myths of the fusang tree where ten sun-birds perched — one sun is missing, and some scholars suspect it once stood at the tree's lost summit.