Eocene–Oligocene extinction event

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

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 occurring between 33.9 and 33.4 million years ago. It was marked by large-scale extinction and floral and faunal turnover, although it was relatively minor in comparison to the largest mass extinctions. In Europe it is also known as the Grande Coupure (French for "great cut"), marked by the extinction of many endemic mammal groups present in the region during the Eocene, and the immigration of previously absent mammal groups into Europe from Asia.

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