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The Late Devonian mass extinction was one of the five largest mass extinction events in the history of life, said Professor Johnny Waters, who is a co-leader of the five-year, U.N. International Geoscience Programme project that began in 2011.
The lower boundary of the Mesozoic is set by the PermianâTriassic extinction event, during which approximately 90% to 96% of marine species and 70% of terrestrial vertebrates became extinct. It is also known as the Great Dying because it is considered the largest mass extinction in the Earth's history.