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However the new excavations and dating techniques unavailable in 2004 showed this was not the case.
He said the area where the original skeleton was found was a "remnant pedestal" of older sediment that had remained while the area around it had been eroded away.
Over 20,000 years this pedestal had been covered by "younger" sediment.
The ages of those younger overlying sediments were originally thought to apply to the 'hobbit' remains, Professor Roberts said.
This overturns original dating that suggested the hobbit and its tools had disappeared as late as 12,000 years ago.
Professor Bert Roberts, of the University of Wollongong's Centre for Archaeological Science, who was part of the team that made the original discovery in 2003 co-authored the latest study.