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Eocene–Oligocene extinction event

Mass extinction event 33.9 million years ago / From Wikipedia, the free encyclopedia

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The Eocene–Oligocene extinction event, also called the Eocene-Oligocene transition (EOT) or Grande Coupure (French for "great cut"), is the transition between the end of the Eocene and the beginning of the Oligocene, an extinction event and faunal turnover occurring between 33.9 and 33.4 million years ago.[1] It was marked by large-scale extinction and floral and faunal turnover, although it was relatively minor in comparison to the largest mass extinctions.[2]

Marine extinction intensity during the Phanerozoic
Millions of years ago
Eocene–Oligocene extinction is labeled E–OG.

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