HERVE CONGE,ISM / SCIENCE PHOTO LIBRARY HERVE CONGE,ISM / SCIENCE PHOTO LIBRARY
Trilobite fossil (Diacalymene ouzregui). This extinct bottom dwelling marine arthropod had a worldwide distribution. It lived during the Ordovican and Silurian periods, 490-416 million years ago. It scavenged for food on the seabed.
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