Until now,
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, the oldest human sites in Australia’s huge,
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, arid interior dated to no more than 44,
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,000 years ago in the continent’s northwest, not far from where the first settlers presumably arrived. Lake Mungo,
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, now a dry lake bed in southeastern Australia, has yielded artifacts from about 50,000 years ago. Unlike artifacts at Warratyi that represent human activity over a long time span,
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, it’s not known if Lake Mungo finds come from a group that made an isolated foray into the region before dying out within a few generations.
Hamm’s group unearthed evidence of an intermittent human presence at Warratyi that lasted from around 49,000 to 10,000 years ago. People were largely absent between around 35,000 and 17,000 years ago, when the climate became substantially colder and drier,
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, Hamm says.
Finds at Warratyi dating to between 49,000 and 46,
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,000 years ago include stone tools and a piece of reddish pigment. Bones from 16 mammal species and one reptile species were unearthed from various layers of sediment. Of particular interest were a partial leg bone from an extinct, rhino-sized marsupial and eggshells from a large,
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, flightless bird. These animals died out not long after humans reached Australia, but it hasn’t been clear whether humans contributed to the extinctions via hunting or other actions (
SN: 1/20/07, p. 38).
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