SINCLAIR STAMMERS / SCIENCE PHOTO LIBRARY SINCLAIR STAMMERS / SCIENCE PHOTO LIBRARY
Sea stacks. Carboniferous limestone sea stack formations. Sea stacks are pillars of sedimentary rock that were once part of the adjoining coast. They form when parts of the coast are isolated by wave erosion. This limestone is between 345 and 280 million years old. These are the Elegug Stacks, also known as Stack Rocks, off the Pembrokeshire coast of Wales.
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