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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.
This was what happened during the first mass extinction of animal life on the Earth, 440 million years ago. (Photo: Colourbox). With its warm climate and plenty of food, the Earth was a good place to live for the many animals with shells, legs and teeth. Animal life had just conquered the oceans 440 million years ago.