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