500 million years ago
From Multiversal Omnipedia
- Real World: 488 million years ago. Beginning of Ordovician Period. A mass extinction at the end of this period wipes out 60% of marine life on Earth.
- Real World: 443 million years ago. Beginning of Silurian Period. First land plants on Earth.
- Real World: 416 million years ago. Beginning of Devonian Period. The first land animals appear, including amphibians and insects, on Earth.
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