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The Cambrian Period

https://ucmp.berkeley.edu/cambrian/camb.html

“The Cambrian Period The Cambrian Period 543 to 490 Million Years Ago The Cambrian Period marks an important point in the history of life on earth; it is the time when most of the major groups of animals first appear in the fossil record. This event is sometimes called the "Cambrian Explosion",...” (from the page’s text)

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