JEREMY BISHOP / SCIENCE PHOTO LIBRARY JEREMY BISHOP / SCIENCE PHOTO LIBRARY
Sandstone rock at low tide. Moisture left by a receding tide highlights fractures (parallel lines) in an exposed layer of sandstone. At right are small boulders of the same stone that represent a subsequent stage in the erosive cycle. This coastline is of Carboniferous age (299 to 359 million years old). Photographed in northern Cornwall, England.
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