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Even after a technology that could test that assumption, uranium-thorium dating, became available, no one thought to apply it to the Indonesian cave — until now.

Though the paint itself cannot be dated, uranium-thorium dating can estimate the age of the bumpy layers of calcium carbonate (known as ‘cave popcorn’) that formed on the surface of the paintings.

These deposits, which cannot be older than the cave art itself when they overlie the cave paintings, provide a minimum age for the artwork.

The age of the calcite was determined by a technique known as uranium-thorium (U-Th) dating, which is less destructive than radiocarbon dating and only requires a few milligrams of sample material.

Stylistically, some of the paintings resemble those found in Europe.

There are hand stencils that would have been created as a person spit or sprayed red pigment over his or her hand to leave the outline of a handprint.

The researchers’ results are published in the 15 June issue of the journal is excited to be publishing this paper because it both develops an approach for dating cave art and provides a rich series of dates on art in numerous caves,” said Brooks Hanson, the journal’s deputy editor for the physical sciences.

Cave paintings are among some of the earliest examples of art and human symbolic behavior, but inconsistencies produced by radiocarbon dating techniques have prevented archaeologists from understanding how different styles and practices developed.

The analysis hints at “just what a wealth of undiscovered information there is in Asia”, says Alistair Pike, an archaeologist at the University of Southampton, UK, who in 2013 identified what had been considered the world’s oldest cave art, in Europe, and had no involvement in the current project.

"These were dated using radiocarbon dating of charcoal buried at the same depth of engravings," he says.

Beyond engravings, the oldest reliably-dated rock art in Australia is 28,000 years old.

Australia is blessed with many beautiful examples of Aboriginal cave paintings and engravings but what does science tell us about how old they are?

What are the different methods used to date such artworks?

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