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At the beginning of the Triassic period, a mass extinction wiped out most large land animals. The remaining animals quickly evolved to fill the empty niches, and one line led to the earliest dinosaurs. Another, less severe, mass extinction at the end of the Triassic eliminated the animals that were significant competition to the dinosaurs. With these animals out of the way, dinosaurs quickly diversified to fill the empty niches.

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What period was named after the jura mountains?

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