End–Triassic extinction event facts for kids

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The End–Triassic extinction event marks the boundary between the Triassic and Jurassic periods, 199.6 million years ago. However, many of the extinctions occurred before then in the Upper Triassic.

Overall, this was one of the major extinction events of the Phanerozoic eon. It profoundly affected life on land and in the oceans. At least half of the species now known to have been living on Earth at that time went extinct.

A whole class (conodonts: extinct chordates); 20% of all marine families; all large crurotarsans (non-dinosaurian archosaurs); some remaining therapsids; and many of the large amphibians were wiped out.

The event emptied many ecological niches, and allowed the dinosaurs to assume the dominant roles in the Jurassic period. This event happened in less than 10,000 years, and occurred just before Pangaea started to break apart.

Scientists have suggested several explanations for this event, but all have unanswered challenges:

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End–Triassic extinction event Facts for Kids. Kiddle Encyclopedia.