Day after sweltering day on the banks of the Modi stream, archeologists are dealing shattering blows to traditional views of Chinese history as they work their way through the parched, yellow earth.
One of the world's great cities once flourished here at Jinsha village in China's southwest, the 1000BC equivalent of New York or Paris, and then inexplicably vanished, leaving no trace behind in the historical records.
Until recently, locals had no idea they were living on top of a great lost bronze-age civilization.
"Of course, people get excited when they hear that their home area has such a long history, such an advanced culture, and such refined art," said Jiang Zhanghua, deputy head of the Institute of Archeology in nearby Chengdu City.
The discovery of the site was entirely fortuitous, reflecting how much of the patchy record of the pre-historic past has come together merely by chance.
On a winter day in early 2001, excavation teams sent to the site by a property developer unearthed large numbers of ivory and jade artifacts that clearly suggested a major find.
If the company had decided to just carry on its work, covering the site in concrete as is believed by archeologists to be quite common, the Jinsha civilization might have been forgotten forever. But they called in authorities.
Weird masks
In and by themselves, the artifacts are striking in their weirdness -- masks with strangely protruding eyes, cult statues frozen in poses of unknown, but likely religious, significance.
More importantly, the spectacular discovery in Jinsha has added to the mass of evidence forcing historians to rethink Chinese history as a whole.
It is now clear that Chinese culture had multiple origins and did not, as previous generations of historians confidently believed, follow a simple path from just one single source.
It is a popular idea that the cradle of Chinese civilization is in the Yellow River valley about 1,000km northeast of Chengdu, and matured there before gradually spreading southward.
If nothing else, this traditional concept of history is supported by ancient myths about the Yellow Emperor and other early rulers, held dear by many Chinese.
But historians have long suspected this cannot be right. Ever since, that is, the discovery of the Sanxingdui civilization, about 50km from the Jinsha excavation site.
Here archeologists have been unearthing artifacts for most of the 20th century, discovering what now is confirmed as one of the world's major pre-historic civilizations.
The Sanxingdui culture, which blossomed from 5000BC to 3000BC, is characterized by the same radical strangeness as that unearthed at Jinsha.
Masks with oversized eyes and eyebrows, with some of them covered with gold leaf, are among its hallmarks.
But even as they display unique features, both Sanxingdui and Jinsha also show remarkable parallels with other ancient cultures.
Sacred sun and trees
"Sun worship was practiced here at the same time as it formed a central part of ancient Egyptian cults," says Zhu Yarong, a young historian at the large museum erected at Sanxingdui.
"People here appear to have worshipped sacred trees, just like in Mesopotamia, in modern-day Iraq," she says.
As the archeologists analyze the finds, they try to solve important questions, such as why the Sanxingdui site had a city wall while Jinsha did not.
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