JEREMY BISHOP / SCIENCE PHOTO LIBRARY JEREMY BISHOP / SCIENCE PHOTO LIBRARY
Carboniferous sandstone and shale layers (right). Exposed layers (strata) of rock of Carboniferous age (299 to 359 million years old) comprising alternating layers of sandstone (the thicker layers) and shale. Beach rocks and pebbles are at left. Photographed in northern Cornwall, England.
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