DETLEV VAN RAVENSWAAY / SCIENCE PHOTO LIBRARY DETLEV VAN RAVENSWAAY / SCIENCE PHOTO LIBRARY
Devonian layer. The Devonian period extended from 408 to 360 million years ago. It was characterised by the development of complex plant life on land and by tetrapods and sharks in the sea. In this photograph, taken in Eifel in Germany, rock from the Devonian period has been exposed to reveal fossilised plants and animals.
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