Cambrian–Ordovician extinction event
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The Cambrian–Ordovician extinction event occurred approximately 488 million years ago (m.y.a.). This early Phanerozoic Eon extinction event eliminated many brachiopods and conodonts, and severely reduced the number of trilobite species.
- Depletion of oxygen in marine waters
- Flood basalt event (Kalkarindji large igneous province, Australia) 
- End-Botomian extinction event, circa 517 m.y.a.
- Dresbachian extinction event, circa 502 m.y.a.
- Geologic time scale
- Furongian, Late or Upper Cambrian period
- Early Ordovician period
- Gradstein, Felix, James Ogg, and Alan Smith, eds., 2004. A Geologic Time Scale 2004 (Cambridge University Press).
- Hallam, Anthony and Paul B. Wignall, 1997. Mass extinctions and their aftermath (Oxford University Press).
- Webby, Barry D. and Mary L. Droser, eds., 2004. The Great Ordovician Biodiversification Event (Columbia University Press).
- Kravchinsky, V. A. (2012). Paleozoic large igneous provinces of Northern Eurasia: Correlation with mass extinction events. Global and Planetary Change, 86, 31-36.
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