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The term "Eocene" is derived from Ancient Greek Ἠώς (Ēṓs) meaning "Dawn", and καινός kainos meaning "new" or "recent", as the epoch saw the dawn of recent, or modern, life. Scottish geologist Charles Lyell (ignoring the Quaternary) divided the Tertiary Epoch into the Eocene, Miocene, Pliocene, and New Pliocene Periods in 1833.
2.3.1.2 Eocene Epoch. 2.3.1.3 Oligocene Epoch. 2.3.2 ... Major volcanic events altering the Earth's environment and causing extinctions may have occurred 10 times in ...
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]
c. 33.9 Ma – End of Eocene, start of Oligocene epoch. c. 35 Ma – Grasslands first appear. Glyptodonts, ground sloths, peccaries, dogs, eagles, and hawks evolve. c. 33 Ma – First thylacinid marsupials evolve. c. 30 Ma – Brontotheres go extinct. Pigs evolve. South America separates from Antarctica, becoming an island continent.
This is a list of extinction events, both mass and minor: [1] "Big Five" major extinction events (see graphic) ... Eocene–Oligocene extinction event:
The Eocene-Oligocene Boundary 33.9 million years ago was the transition from the last greenhouse period to the present icehouse climate. [ 17 ] [ 18 ] [ 10 ] At this point, when ~25% more of Antarctica's surface was above sea level and able to support land-based ice sheets relative to today, [ 19 ] CO 2 levels had dropped to 750 ppm. [ 20 ]
The Eocene-Oligocene transition was a major cooling event and reorganization of the biosphere, [33] [34] being part of a broader trend of global cooling lasting from the Bartonian to the Rupelian. [ 35 ] [ 36 ] The transition is marked by the Oi1 event, an oxygen isotope excursion occurring approximately 33.55 million years ago, [ 37 ] during ...
The Eocene Epoch, the middle epoch during the Paleogene Period of the Cenozoic Era ... Eocene events (3 C, 3 P) G. Eocene geochronology (4 C, 4 P)