JOHN SIBBICK / SCIENCE PHOTO LIBRARY JOHN SIBBICK / SCIENCE PHOTO LIBRARY
Pagetia bootes. Illustration of Pagetia bootes, a trilobite known from fossils in the Burgess Shale site (508 million years old) in British Columbia, Canada. The Burgess Shale fossil site records a key moment in Earth's history, the Cambrian Explosion, when an unprecedented period of evolution produced a wide diversity of body types, including those of today's animals.
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