Eocene–Oligocene extinction event

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What Wikipedia says

The Eocene–Oligocene extinction event, also called the Eocene-Oligocene transition (EOT), is the transition between the end of the Eocene and the beginning of the Oligocene, an extinction event and faunal turnover occurred from around 33.9 to 33.4 million years ago.

Excerpt from the Wikipedia article “Eocene–Oligocene extinction event”, under the CC BY-SA 4.0 license. Read the article on Wikipedia

Image: Robert A. Rohde, CC BY-SA 3.0, via Wikimedia Commons.