Mass extinction linked to ancient climate change

Thursday, January 27, 2011 - 15:20 in Paleontology & Archaeology

About 450 million years ago, Earth suffered the second-largest mass extinction in its history -- the Late Ordovician mass extinction, during which more than 75 percent of marine species died. Exactly what caused this tremendous loss in biodiversity remains a mystery, but now scientists have discovered new details supporting the idea that the mass extinction was linked to a cooling climate.

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