A diverse array of animals was found in
   fossils  from  the Burgess Shale site in British Columbia, dating from
   the Cambrian period of the Phanerozoic eon.
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   They include:
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   Pikaia (swimming eel-like chordate)
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   Hallucigenia (with spikes on seafloor)
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   Anomalocaris (large predator with claws)
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   Marella (arthropod swimming at left)
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   Ottoia (burrowing U-shaped worm)
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   Cambrian exhibit at the Field Museum. 7
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