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The first epoch in the Silurian period
443 million years ago -
every year is equivalent to 2 million years
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1st minor mass extiction
428 mil years ago -
The oldest known Cooksonia appear
428 million years ago -
2nd minor mass extinction
424 mil years ago -
The third epoch in the Silurian period
423 million years ago -
3rd minor mass extiction
420 mil years ago -
The last and shortest epoch in the Silurian period
419 million years ago -
End of Silurian Period
416 million years ago