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The Ordovician

https://ucmp.berkeley.edu/ordovician/ordovician.html

“The Ordovician period began approximately 490 million years ago, with the end of the Cambrian, and ended around 443 million years ago, with the beginning of the Silurian. At this time, the area north of the tropics was almost entirely ocean, and most of the world's land was collected into the...” (from the page’s text)

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