Text by GEOFF VIVIAN
TWO Australian National University researchers have used a high-tech isotopic method to estimate the potential age of the Burrup Peninsula’s rock art, based on the rate at which the rock surface erodes.
Geologist Professor Brad Pillans and nuclear physicist Professor Keith Fifield employed cosmogenic radionuclide measurements of the isotope beryllium-10 on rock surfaces at the world-famous Pilbara site.
They concluded that the oldest carvings could be 20- 30,000 years old, or even older, which implies they were possibly made when the site was a range of low hills about 100km inland from the glacial-period coastline. Continue reading