Ordovician-Silurian Extinction (445 million years ago) β #4 in Top 10 Worst Extinction Events in History | Top10Grid
#4
Ordovician-Silurian Extinction (445 million years ago)
Rapid glaciation caused sea levels to plummet, destroying shallow marine habitats and killing 85 percent of marine species in what was the first of the "Big Five" mass extinctions.
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