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Extinctions are continuous throughout the Phanerozoic. Although a single natural phenomenon brought about by environmental change at any scale, they may be conveniently divided into two classes: background extinction and mass extinction (Raup and Sepkoski, 1982). The Frasnian-Famennian extinction is an example of mass extinction, and a large body oceanic impact has been suggested as a triggering mechanism (McLaren, 1970). Organisms most affected were shallow water benthos, especially corals, stromatoporoids, and brachiopods living on tropical to subtropical continental areas extending from western Canada eastward around the world to western Australia. Plotting taxa on charts does not necessarily give the scale...

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