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Burgess Shale fossils found in the Rocky Mountains in western Canada in 1909 are believed to be dated about 520 million years old. Animals having bizarre shapes, without bones or shells, are here preserved intact.
Groups related to many of the modern animals have been identified in this assemblage.
The Burgess Shale has made a major contribution to the study of evolution. Another area of significance is attached to the Burgess Shale fossils.

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