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299–251 ẹgbẹgbẹ̀rún ọdun sẹ́yìn
|Mean atmospheric O2 content over period duration||ca. 23 Vol %
(115 % of modern level)
|Mean atmospheric CO2 content over period duration||ca. 900 ppm
(3 times pre-industrial level)
|Mean surface temperature over period duration||ca. 16 °C
(2 °C above modern level)
|Sea level (above present day)||Relatively constant at 60m in early Permian; plummeting during the middle Permian to a constant −20 m in the late Permian.|
The Permian[note 1] is a geologic period and system characterized among land vertebrates by the diversification of the early amniotes into the ancestral groups of the mammals, turtles, lepidosaurs and archosaurs. The Permian Period follows the Carboniferous and extends from 299.0 ± 0.8 to 251.0 ± 0.4 Mya (million years before the present). It is the last period of the Paleozoic Era and famous for its ending epoch event, the largest mass extinction known to science. The Permian Period was named after the Perm Krai in Russia by Scottish geologist Roderick Murchison in 1841.
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Akiyesi[àtúnṣe | edit source]
- The term "Permian" was introduced into geology in 1841 by Sir Sir R. I. Murchison, president of the Geological Society of London, who identified typical strata in extensive Russian explorations undertaken with Edouard de Verneuil; Murchison asserted in 1841 that he named his "Permian system" after the ancient kingdom of Permia, and not after the then small town of Perm, as usually assumed; see "Origin of the Permian"
Itokasi[àtúnṣe | edit source]
|Preceded by Proterozoic Eon||542 Ma - Phanerozoic Eon - Present|
|542 Ma - Paleozoic Era - 251 Ma||251 Ma - Mesozoic Era - 65 Ma||65 Ma - Cenozoic Era - Present|