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Thousands of years ago, people living on the high mountains of the Tibetan plateau waded into a steamy hot spring, leaving behind footprints in the soft mud.
Older known human camps do exist in the region, dating to between 9,000 and 15,000 years ago, but they were likely short-term, seasonal sites, the researchers said.
[See Photos of Chusang, the Oldest Known Site Occupied Year-Round on the Tibetan Plateau] "Chusang is special because you have these human footprints in this carbonate mud," said study co-lead researcher Michael Meyer, an assistant professor of geology at the University of Innsbruck in Austria.
Analytical techniques are very advanced and precise, but they may be inaccurate.
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Based on earlier analyses of other human sites, it was thought that the plateau's earliest permanent human residents had settled there no earlier than 5,200 years ago, the researchers said.
But these newfound dates make the ancient Tibetan site of Chusang the oldest permanent base of people on the Tibetan plateau, they said.
"[The footprints] are hardened, so they were able to stay there for thousands or tens of thousands of years." After humans left Africa, they spread across the globe, but it's not entirely clear when they made it to the mountainous region of Tibet, the researchers said.
So, when the Chusang site, which shows clear signs of ancient human occupation, was discovered in 1998, researchers rushed to study it.
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The form of these loess dunes has been explained by a combination of wind and tundra conditions.