Ìgbà Pẹ́rmíà
From Wikipedia, the free encyclopedia
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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Ìgbà Pẹ́rmíà 299–251 ẹgbẹgbẹ̀rún ọdun sẹ́yìn | |
Mean atmospheric O2 content over period duration | ca. 23 Vol %[1] (115 % of modern level) |
Mean atmospheric CO2 content over period duration | ca. 900 ppm[2] (3 times pre-industrial level) |
Mean surface temperature over period duration | ca. 16 °C[3] (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.[4] |
Àwọn ìṣẹ̀lẹ̀ pàtàkì Ìgbà Pẹ́rmíà -300 — – -295 — – -290 — – -285 — – -280 — – -275 — – -270 — – -265 — – -260 — – -255 — – -250 — Asselian Sakmarian Artinskian Kungurian Roadian Wordian Capitanian Wuchia- pingian Changhsin… Mesozoic Palæozoic Lopingian (Upper Permian) Guadalupian (Middle Permian) Cisuralian (Lower Permian) An approximate timescale of key Permian events. Axis scale: millions of years ago. |
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