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Canberra'. Thorne counters that Bowler's team used one dating technique, while his used three. Best practice is to have at least two methods producing the same result. A Thorne team member, Professor Rainer Grün, says the fact that the latest results were consistent between laboratories doesn't mean they are correct. "We now have two data sets that are contradictory. I do not have a plausible explanation. Thorne recently made headlines with a study of Mungo Man's DNA, which he claimed supported his idea that modern humans developed from archaic humans in several places around the world, rather than emerging from Africa a relatively short time ago. Now, however, Thorne says the age of Mungo Man is irrelevant. Recent fossil finds show that modern humans were in China 110,000 years ago. 'So he has a long time to arrive in Australia. It doesn't matter if he is 40,000 or 60,000 years old. In 2001, a member of Bowler's team, Dr Richard Roberts of Wollongong University, along with Flannery, Director of the South Australian Museum, published research on the extinction of the megafauna. They dated 28 sites across the continent, arguing that their analysis showed that the megafauna died out suddenly 46,600 years ago. This conclusion has been challenged by other scientists, including Dr Judith Field of the University of Sydney and Dr Richard Fullager of the Australian Museum, who point to the presence of megafauna fossils at the 36,000 -year-old Cuddie Springs site in NSW. Flannery praises the Bowler team's research as thorough and rigorous. He says the finding that humans arrived at Lake Mungo between 46,000 and 50,000 years ago supports the idea that that was a critical time in Australia's history. There is no evidence of a dramatic climate change at that time, he says. 'It's my view that humans arrived and megafauna extinction took place in almost the same geological instant. Bowler, however, is sceptical of Flannery's theory about the disappearance of the giant animals. He argues that climate change 40,000 years ago was more intense than has been previously realised and could have played an important role in their extinction.