|Regional usage||Global (ICS)|
|Time scale(s) used||ICS Time Scale|
|Time span formality||Formal|
|Lower boundary definition||FAD of the conodont Streptognathodus isolatus within the morphotype Streptognathodus wabaunsensis chronocline|
|Lower boundary GSSP||Aidaralash, Ural Mountains, Kazakhstan|
|Lower GSSP ratified||1996|
|Upper boundary definition||FAD of the Conodont Jinogondolella nanginkensis|
|Upper boundary GSSP||Stratotype Canyon, Guadalupe Mountains, Texas, U.S.A.|
|Upper GSSP ratified||2001|
The Cisuralian is the first series/epoch of the Permian. The Cisuralian was preceded by the Pennsylvanian and followed by the Guadalupian. The Cisuralian Epoch is named after the western slopes of the Ural Mountains in Russia and Kazakhstan and dates between 298.9 ± 0.15 – 272.3 ± 0.5 Mya.
Name and background
The name "Cisuralian" was proposed in 1982, and approved by the International Subcommission on Permian Stratigraphy in 1996. The Cisuralian Epoch is named after the western slopes of the Ural Mountains in Russia and Kazakhstan.
The base of the Cisuralian series and the Permian system is defined as the place in the stratigraphic record where fossils of the conodont Streptognathodus isolatus first appear. The global reference profile for the base (the GSSP or golden spike) is located in the valley of the Aidaralash River, near Aqtöbe in the Ural Mountains of Kazakhstan.
Gondwana collided with Laurussia and created the Alleghenian orogeny in present-day North America. In northwestern Europe, the Hercynian orogeny continued. This created the large supercontinent, Pangea, by the middle of the early Permian, which was to have an impact on the climate.
At the start of the Permian, the Late Palaeozoic Ice Age, which began in the Carboniferous, as at its peak. Glaciers receded over the course of the late Cisuralian as the Earth's climate gradually warmed, particularly during the Artinskian Warming Event, drying the continent's interiors. The pan-tropical belt of Pangaea experienced particularly significant aridification during this epoch.
The coal swamps from the Carboniferous continued and the herbivores, Diadectes and Edaphosaurus. The dry interior with small insectivores. Caseids and prototherapsid Tetraceratops made their appearance. The marine life was probable more diverse than modern times as the climate warmed. Unusual sharks such as Helicoprion continued in this series.
Early Permian terrestrial faunas were dominated by pelycosaurs, diadectids, and amphibians, The pelycosaurs appeared during the Late Carboniferous, and reached their apex in the Cisuralian remaining the dominant land animals for some 40 million years. A few continued into the Capitanian. They were succeeded by the therapsids.
Helicoprion bessonovi with characteristic 'tooth-whorl' at front of jaw
- Asselian stage (298.9 ± 0.15 – 294.6 ± 0.8 Mya)
- Sakmarian stage (294.6 ± 0.8 – 290.1 ± 0.7 Mya)
- Artinskian stage (290.1 ± 0.7 – 283.5 ± 0.7 Mya)
- Kungurian stage (283.5 ± 0.7 – 272.3 ± 0.5 Mya)
- New Zealand
- Telfordian (289 – 278 Mya)
- Mangapirian (278 – 270.6 Mya)
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