A supplied image shows Chris Clarkson, Richard Fullagar and Elspeth Hayes examining a rare grindstone which was excavated at the Madjedbebe site located in the Kakadu region in northern Australia June 29, 2015 which has revelead that humans reached the country at least 65,000 years ago - up to 18,000 years earlier than archaeologists previously thought. Dominic O'Brien-Gundjeihmi Aboriginal Corporation/Handout via REUTERS
SYDNEY (Reuters) - Axheads and grinding stones from a cave in Australia's far north suggest humans arrived on the continent about 65,000 years ago, or 18,000 years earlier than previously thought, according to research published on Thursday.
A technique called luminescence dating was used to date the ancient tools which were found in a rock shelter at the bottom of a cliff, on the edge of a sandy savannah plain some 300 km (186 miles) east of Darwin.
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