Roberts, Richard; Bird, Michael; Olley, Jon; Galbraith, Rex; and others.
Optical and radiocarbon dating at Jinmium rock shelter in northern Australia.
Nature 393. 6683 (May 28, 1998): 358 (5 pages).

Abstract
Research shows that quartz sand found with at ancient human dwelling sites in the Jinmium rock shelter, Northern Australia, is 22 thousand years old. Multi-grain optical radiocarbon dating methods demonstrate that the quartz sand consists of relatively young grains dated less than ten thousand years old. Evidence suggests that some grains of sand appear to be older because they were not exposed to sunlight prior to their burial. [Initial thermoluminescent dates had been set at 116,000.]