Cambrian–Ordovician extinction event
Mass extinction event about 488 million years ago / From Wikipedia, the free encyclopedia
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The Cambrian–Ordovician extinction event, also known as the Cambrian-Ordovician boundary event,[1] was an extinction event that occurred approximately 485 million years ago (mya) in the Paleozoic era of the early Phanerozoic eon.[2] It was preceded by the less-documented (but probably more extensive) End-Botomian mass extinction around 517 million years ago, and the Dresbachian extinction event about 502 million years ago.
The Cambrian–Ordovician extinction event ended the Cambrian period, and led into the subsequent Ordovician period. It eliminated many brachiopods and conodonts, and severely reduced the number of trilobite species.[1]