The Paleocene Eocene Thermal Maximum - amazonia.fiocruz.br

The Paleocene Eocene Thermal Maximum Video

Episode 103 - The Paleocene-Eocene Thermal Maximum The Paleocene Eocene Thermal Maximum

The Paleocene Eocene Thermal Maximum - final

It is the second epoch of the Paleogene Period in the modern Cenozoic Era. The Eocene spans the time from the end of the Paleocene Epoch to the beginning of the Oligocene Epoch. The start of the Eocene is marked by a brief period in which the concentration of the carbon isotope 13 C in the atmosphere was exceptionally low in comparison with the more common isotope 12 C. The end is set at a major extinction event called the Grande Coupure the "Great Break" in continuity or the Eocene—Oligocene extinction event , which may be related to the impact of one or more large bolides in Siberia and in what is now Chesapeake Bay. As with other geologic periods , the strata that define the start and end of the epoch are well identified, [8] though their exact dates are slightly uncertain. The end of the Eocene was marked by the Eocene—Oligocene extinction event , also known as the Grande Coupure. The Eocene is conventionally divided into early 56— The Ypresian stage constitutes the lower, the Priabonian stage the upper; and the Lutetian and Bartonian stages are united as the middle Eocene. During the Eocene, the continents continued to drift toward their present positions. At the beginning of the period, Australia and Antarctica remained connected, and warm equatorial currents mixed with colder Antarctic waters, distributing the heat around the planet and keeping global temperatures high, but when Australia split from the southern continent around 45 Ma, the warm equatorial currents were routed away from Antarctica.

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The most extreme change in Earth surface conditions during the Cenozoic Era began just after the temporal boundary between the Paleocene and Eocene epochs around That is a 0. Many benthic foraminifera and terrestrial mammals became extinct, Eoceme numerous modern mammalian orders emerged. The latter observations strongly suggest that a massive input of 13C-depleted carbon entered the hydrosphere or atmosphere at the start of the PETM.

Recently, geoscientists have begun to investigate the PETM to better understand the fate and transport of increasing greenhouse-gas emissions over millennial time scales. Home Contact Privacy. Paleocene—Eocene Thermal Maximum The most extreme change in Earth surface conditions during the Cenozoic Era began just after the temporal boundary Paleoene the Paleocene and Eocene epochs around Axis scale: Ma before present. Source s : Wikipedia Creative Commons.]