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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.
It is believed that Dinosaurs mass extinction happened 65 million years ago which ended the Mesozoic era. Only at the end of the nineteenth century did paleontologists realize that nearly all dinosaurs had gone extinct within a brief period of tim... This page may be out of date. Save your draft before refreshing this page.