The black line you see on the rock is from minerals from the water sticking to the rock.these are rock paintings from Aborigines. the oldest one they have dated is 20,000 years old. There are probably even older ones. this is because the Aborigines wrote over other paintings. So there are many layers of paintings. the watering hole you see is the biggest next or near Ularu. this is also about how big it gets. It had rained in the central part of the outback 2 days ago. it only rains once a year most of the time.
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