jan 1, 33900000 BC - Eocene Period Ends

Description:

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. Another speculation points to several large meteorite impacts near this time, including those of the Chesapeake Bay crater 40 km (25 mi) and the Popigai impact structure 100 km (62 mi) of central Siberia, which scattered debris perhaps as far as Europe. New dating of the Popigai meteor strengthens its association with the extinction.

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