Ordovician–Silurian Extinction (1 nov 439000000 ano antes da era comum – 5 jul 440000000 ano)

Descrição:

86% of life on Earth was wiped out. Scientists believe two major events resulted in this extinction: glaciation and falling sea levels. The majority of the animal life lived in the ocean. Trilobites, brachiopods, and graptolites died off in large numbers but interestingly, this did not lead to any major species changes during the next era.

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