The time in the history of Earth when evolution was progressing at the most rapid rate, as evidenced by fossils such as those of the Burgess Shale, is the:

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The Cambrian period is known for the "Cambrian Explosion," a time when there was a rapid diversification of life and many major groups of animals first appeared in the fossil record, including those found in the Burgess Shale.

The Time in the History of Earth When Evolution Was