Researchers: Cambrian explosion ended surprisingly quickly | Uncommon Descent

Cambrian seascape off South Australia/Katrina Kenny, (CC BY-NC-ND) The explosion lasted only about 20 million years, their research shows, and the subsequent 520 million years featured more even rates of change: At (or shortly before) the start of the Cambrian Period (541 million years ago),

Source: Researchers: Cambrian explosion ended surprisingly quickly | Uncommon Descent

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