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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.
There was at least 1 mass extinction event during this period that covered the time between 4.6 Ga (billion years ago) to 523 Ma (million years ago), occurring near the end of the period.During this period all organisms were soft-bodied, the first hard-shelled forms didn't evolve until the the Cambrian.here was at least 1 mass extinction event during this period that covered the time between 4.6 Ga (billion years ago) to 523 Ma (million years ago), occurring near the end of the period.