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Anther occurred when the Cretaceous period became the Tertiary about 65 million years ago, when 75 percent of species disappeared. This article is about the first mass extinction at the end of the Ordovician geological period 440 million years ago, when about 86 percent of species were killed.
Global cooling seems to have been a primary cause and there may also have been some meteorite impacts during this time. 3) End Permian Extinctions. The mass extinction that occurred at the end of the Permian was the worst mass extinction in history. An estimated 96% of marine species became extinct.lobal cooling seems to have been a primary cause and there may also have been some meteorite impacts during this time. 3) End Permian Extinctions. The mass extinction that occurred at the end of the Permian was the worst mass extinction in history. An estimated 96% of marine species became extinct.