DR MORLEY READ / SCIENCE PHOTO LIBRARY DR MORLEY READ / SCIENCE PHOTO LIBRARY
Coastal erosion. Strata of mudstone exposed and eroded by wave action. At centre is a small sea stack, a pillar that has been eroded until it stands alone, connected only by a narrow neck of rock to the cliffs from which it originated. Mudstone is an argillaceous sedimentary rock that produces a fine sediment on erosion, creating dark muddy beaches. Photographed on the Pacific coast south of Esmeraldas, Ecuador.
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