SINCLAIR STAMMERS / SCIENCE PHOTO LIBRARY SINCLAIR STAMMERS / SCIENCE PHOTO LIBRARY
Anticlinal rock fold. Tourist admiring an anticlinal chevron fold in rock strata. The strata were originally horizontal and planar. They formed from the gradual deposition of material during the Silurian period (443-417 million years ago). Over time the strata became uplifted and distorted by pressures within the Earth. Erosion from the nearby sea then revealed the twisted layers. Photographed at Cwmtydu, Wales, UK.
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