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Half a Billion Years Ago, Trilobites Died in Strange, Orderly Lines

extinction - Students | Britannica Kids | Homework Help

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Trilobites first emerged around 520 million years ago and would go on

Trilobites... So Many Trilobites… - Darwin's Door

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The big five mass extinctions - Cosmos Magazine

The colorful world of the trilobites | Earth Archives

Trilobites of the World | trilobiti.com