Ordovician–Silurian Extinction (19 ore 2 min, 15 giug 450000000 anni a. C. – 1 agos 439000000 anni a. C.)

Descrizione:

Scientists believe two major events resulted in this extinction: glaciation and falling sea levels.86% of life on Earth was wiped out.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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