DIRK WIERSMA / SCIENCE PHOTO LIBRARY DIRK WIERSMA / SCIENCE PHOTO LIBRARY
Orthoceras fossils . Fossilised remains of Orthoceras sp. nautiloids in their limestone host rock. These aquatic animals lived in Europe and North Africa from the middle Ordovician Period to the Devonian Period (around470-360 million years ago). They are related to squids and the octopus. Specimen from Morocco.
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