This is partly though erosion, with engravings losing about half a grain of rock per year – which is equivalent to 1mm every seven years. It’s possible that by 2060 there may be almost no Aboriginal rock art left. Sadly, while all Aboriginal sites in NSW are under the protection of the National Parks & Wildlife Act 1974 (which makes it illegal to disturb, damage, deface or destroy any relic), they are gradually disappearing. Some engravings are in spots you least expect them on other occasions I’ve explored huge rock platforms that would seem to make an ideal canvas, and have seen no rock art. Of these sites, about 1% are sign-posted or publicly documented. From what is thought to be about 10,000 sites around the Sydney metropolitan area when Europeans colonized Australia, about 4,500 Aboriginal rock art sites are currently registered with the Office of Environment and Heritage.
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