ALAN SIRULNIKOFF / SCIENCE PHOTO LIBRARY ALAN SIRULNIKOFF / SCIENCE PHOTO LIBRARY
Fossil crustacean. Fossilized remains of a Canadaspis sp. Middle Cambrian Era (500 million years ago) arthropod, from the Burgess Shale. It was a marine bottom feeder and dug in the mud for food. It had teeth-like mandibles for grinding prey. It is found in clusters, and is the second most abundant arthropod in the Burgess Shale fossil bed, in Field, British Columbia, Canada. The bodies of many arthropods and other ancient invertebrates were preserved in a mudslide in the sea. Their remains gradually fossilized into rock, which was lifted out of the sea during the formation of the Rocky Mountains.
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