Reflections - a river cascades down Weano Gorge. The with sunlight ablaze red cliffs reflect in the water and give it an orange to bronze colour. Weano Gorge, Hamersley Range, Karijini National Park, Pilbara, Western Australia, Australia. Rocks exposed at the gorges in Karijini originated as fine grained sediment which accumulated on an ancient sea floor 2500 million years ago. At this time the atmosphere contained much less oxygen and the only forms of life were simple bacteria and algae. Many