Ordovician-Silurian extinction | Overview & Facts | Britannica
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Ordovician-Silurian extinction | Overview & Facts | Britannica
Ordovician-Silurian extinction, global event that eliminated some 85 percent of all Ordovician species. It was driven by climate and habitat disruptions caused by the onset of glaciation in Gondwana, the associated fall in sea level, and a subsequent warming period which melted ice and brought about rising sea levels.
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