SINCLAIR STAMMERS / SCIENCE PHOTO LIBRARY SINCLAIR STAMMERS / SCIENCE PHOTO LIBRARY
Large fossil trilobite, Paradoxides sp., from the Cambrian period (approximately 570-500 million years ago). This specimen is approximately 40cm in length and was found in Morocco. The trilobites are an extinct group of marine arthropods, which were distributed throughout the prehistoric oceans. Most trilobites lived on the sea bottom, although some burrowed in sediment and a few were swimmers. They first appeared during the Cambrian period and flourished for more than 200 million years before disappearing from the fossil record during the Permian period (280 to 230 million years ago).
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