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rock engraving ~ There is also some evidence of occupation earlier than the 40,000 BP range. The oldest rock art found in Australia dates from between 45,000 to 65,000 BP. Rock art can take 2 forms: petroglyphs (rock engravings) and pictographs (rock paintings). Rock art can be dated using traditional C14 methods, although optically stimulated luminescence (OSL) and accelerator mass spectrometry (AMS) are also option.