Early Ordovician

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What Wikipedia says

The Early Ordovician is the first epoch of the Ordovician period, corresponding to the Lower Ordovician series of the Ordovician system. It began after the Age 10 of the Furongian epoch of the Cambrian and lasted from 486.85 to 471.3 million years ago, until the Dapingian age of the Middle Ordovician.

Excerpt from the Wikipedia article “Early Ordovician”, under the CC BY-SA 4.0 license. Read the article on Wikipedia

Image: Scotese, Christopher R.; Vérard, Christian; Burgener, Landon; Elling, Reece P.; Kocsis, Ádám T., CC BY 4.0, via Wikimedia Commons.