SINCLAIR STAMMERS / SCIENCE PHOTO LIBRARY SINCLAIR STAMMERS / SCIENCE PHOTO LIBRARY
Sandstone cliffs. Sandstone is a sedimentary rock formed by the deposition of sand in beds, which are then compressed into rock. Bands of sandstone of different colours can be seen on the cliff faces. This sandstone was laid down in the Albian and Aptian stages of the early Cretaceous period, between 125 and 99 million years ago. Photographed at Olhos de Agua, Portugal.
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