1 gen 488300000 anni a. C. - Beginning: The Ordovician Period

Descrizione:

The Ordovician Period lasted almost 45 million years going from 488.3 million years ago to 443.7 years ago.

LINK:
https://cosmosmagazine.com/palaeontology/big-five-extinctions

http://www.ucmp.berkeley.edu/ordovician/ordovician.php

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