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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.
Scientists define a mass extinction as a period of less than two million years in which at least 75 percent of species go extinct. Itâs the End of the World but Weâll Be Fine Nick Romeo May 17, 2013. The Medean world is one out of balance, where over competition leads to mass extinction.