SINCLAIR STAMMERS / SCIENCE PHOTO LIBRARY SINCLAIR STAMMERS / SCIENCE PHOTO LIBRARY
Synclines in rock strata at the coast. A syncline is a downward-pointing fold in rock strata, such as that seen on the near side of the island in the small bay. They form as geological forces compress strata, forcing them to buckle. These strata are made of mudstone, a sedimentary rock formed by the effect of pressure on horizontal mud deposits. They were formed during the Silurian period, which lasted from 444 to 417 million years ago. The strata have been revealed as the sea has eroded away surrounding rocks. Photographed at Cwmtydu, Wales, UK.
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