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Half a Billion Years Ago, Trilobites Died in Strange, Orderly Lines
The colorful world of the trilobites | Earth Archives
Earth Science: Trilobites Long Gone...
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Trilobites first emerged around 520 million years ago and would go on
The big five mass extinctions - Cosmos Magazine
Half a Billion Years Ago, Trilobites Died in Strange, Orderly Lines
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