+The Ordovician was a geological period of ancient Earth, spanning from roughly 485 to 443 million years ago. It witnessed a great [diversification](/wiki/diversification) of marine life, including the rise of early fish, and ended with a major [extinction](/wiki/extinction) event.
+## See also
+- [Paleozoic](/wiki/Paleozoic)
+- [Cambrian](/wiki/Cambrian)
+- [Silurian](/wiki/Silurian)
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