Input (grade 13): Nature 445:422 -425 The dates derived show that all forms of megafauna became extinct in the same rapid timeframe - approximately 47,000 years ago - the period of time in which humans first arrived in Australia.
Output (grade 7): Nature 445:422 -425 The dates show that the last of the megafauna became extinct around the same time, about 47,000 years ago.