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Cambrian Explosion

Cambrian Explosion

In evolutionary theory, the Cambrian explosion is the extremely rapid development of new animal phyla (body shapes) that occurred at the beginning of the Cambrian Period approximately 530-550 million years ago. The duration of time in which these new phyla occurred is approximately 10 million years.1

See the Geological Time Table

References

References
1 This chart was adapted from an insert called the Tower of Time by John Gurche as reproduced in The Thread of Life: The Smithsonian Looks at Evolution by Roger Lewin, Smithsonian Books, Washington, D.C., Distributed by W. W. Norton & Company, New York, N.Y. 1982.

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