Banded sandstone. View of the face of a sandstone rock wall showing the banding patterns caused by the presence of impurities. The reddish-pink tones seen here are produced by iron in the structure of the sandstone itself. Sandstone is a sedimentary rock, one formed through deposition and compression over millions of years. Sandstone is easily eroded, so inner banding patterns are often revealed. Photographed at Petra, in Jordan.
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