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Triassic Jurassic Extinction

About 199.6 million years ago 55% of all species went extinct, this event marks the shift from Triassic and Jurassic periods. Possible causes:

Impact Event: to date no impact crater has been found, the Manicouagan Reservoir in Canada, was an impact 12 million years before the extinction so is not the cause.

Flood Basalt Eruption: Central Atlantic Magmatic Province eruption is considered the most likely cause of the extinction, also as in the Permian-Triassic Extinction the gas hydrates might have played a roll.