The new age estimates for Chusang come from three measures: the decay rate of forms of radioactive thorium and uranium in travertine sampled in and around the prints,
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; determinations of the time since quartz crystals extracted from the travertine were last exposed to sunlight; 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 8,000 to 6,000 years ago, says archaeologist Loukas Barton of the University of Pittsburgh,
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, 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,
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,” 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,
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, he says.

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