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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.
3. PermianâTriassic extinction event (End Permian): This one occurred right about 251 million years ago. It is the largest extinction event that is currently known. It led to the extinction of â57% of all families, 83% of all genera and 90% to 96% of all species.rdovicianâSilurian extinction event (End Ordovician): It occurred about 450â440 million years ago. It actually consisted of two different events, in total they annihilated 27% of all families, 57% of all genera and 60% to 70% of all known species.