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It's a fragment of a charcoal cave painting found buried in an Arnhem Land cave by David and colleagues.The fragment was both preserved and dateable by being buried in carbon-containing soil But dating most rock art isn't usually quite so straightforward.
But there remain a lot of hints and circumstantial evidence around to support the idea that Australia is in fact home to the world's oldest art.
In some cases a similar layer beneath the art gives a maximum age for the art.
In both Spain and Indonesia, the cave art appeared in deep limestone caves.
"It's very likely that there is something extremely old in Australia but it's just very hard to date," says David.
"And there are very few people doing research on rock art." David says there are hand stencils in some limestone caves in North Queensland that are believed to be more than 30,000 years old, and he hopes to be involved in dating these in the future.
Pillans, who studies the Burrup rock engravings, describes the giant bird painting on the Arnhem Land plateau as a "hint of older rock art".