The new age estimates for Chusang come from three measures:&nbsp,
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; the decay rate of forms of radioactive thorium and uranium in travertine sampled in and around the prints; determinations of the time since quartz crystals extracted from the travertine were last exposed to sunlight,
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; and radiocarbon measures of sediment and microscopic plant remains found on the travertine slab’s surface,
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.
Signs of long-term camping at Chusang have yet to turn up,
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, but extensive excavations of the site have not been conducted,
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, Meyer says. His group found chipped rocks and other stone tool?making debris at two spots near Chusang’s hot springs. These finds are undated.
Previous research has suggested that hunter-gatherers occasionally reached the Tibetan Plateau’s northern edge by around 12,000 years ago (SN: 7/7/01, p. 7), and again from about 8,
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,000 to 6,000 years ago,
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, says archaeologist Loukas Barton of the University of Pittsburgh, who wasn’t involved in the study. But the new discoveries at Chusang may not necessarily point to permanent residence there. Those early arrivals likely spent a single summer or a few consecutive years at most on the plateau, Barton says. “That would not constitute a peopling of a region any more than our 1969 visit to the moon did,” he says.
Archaeological finds indicate that human populations expanded on the Tibetan Plateau between around 5,200 and 3,
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,600 years ago, Barton says. Those groups cultivated barley and wheat at high altitudes and herded domesticated sheep and perhaps yaks, he says.

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