The Sawn Rocks, columnar basalt 21 million years old. Mount Kaputar National Park, New South Wales, Australia

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Photo credit: © Ian Beattie/AUSCAPE / Alamy / Afripics
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Keywords: auscape, basalt, basaltic, beattie, columnar, columns, formations, geological, geology, geomorphology, ian, jointing, nandewar, organ, pentagonal, pipes, piping, rock, trachyte, volcano