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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.
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]
The Oligocene is preceded by the Eocene Epoch and is followed by the Miocene Epoch. The Oligocene is the third and final epoch of the Paleogene Period. The Oligocene is often considered an important time of transition, a link between the archaic world of the tropical Eocene and the more modern ecosystems of the Miocene. [9]
The two oldest-known fossil skeletons of bats, unearthed in southwestern Wyoming and dating to at least 52 million years ago, are providing insight into the early evolution of these flying mammals ...
[15] [16] The end of the Eocene was marked by the Eocene–Oligocene extinction event, [17] [18] [19] the European face of which is known as the Grande Coupure. [20] [21] The Oligocene Epoch spans from 33.9 million to 23.03 million years ago. The Oligocene featured the expansion of grasslands which had led to many new species to evolve ...
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 ]
Some scientists say the “Lunar Anthropocene” epoch started in 1959 when the first spacecraft sent by humanity landed on the moon. And it’s just the beginning.
The Eocene Okanagan Highlands are an uplands subtropical to temperate series of lakes from the Ypresian. [5] [6] [7] The Ypresian is additionally marked by another warming event called the Early Eocene Climatic Optimum (EECO). The EECO is the longest sustained warming event in the Cenozoic record, lasting about 2–3 million years between 53 ...