Wuchiapingian
| System | Series | Stage | Age (Ma) |
|---|---|---|---|
| Triassic | Lower | Induan | younger |
| Permian | Lopingian | Changhsingian | 252.2–254.1 |
| Wuchiapingian | 254.1–259.8 | ||
| Guadalupian | Capitanian | 259.8–265.1 | |
| Wordian | 265.1–268.8 | ||
| Roadian | 268.8–272.3 | ||
| Cisuralian | Kungurian | 272.3–283.5 | |
| Artinskian | 283.5–290.1 | ||
| Sakmarian | 290.1–295.0 | ||
| Asselian | 295.0–298.9 | ||
| Carboniferous | Pennsylvanian | Gzhelian | older |
| Subdivision of the Permian system according to the ICS (Geologic Time Scale 2013).[1] | |||
In the geologic timescale, the Wuchiapingian or Wujiapingian (from Chinese: 吴家坪, Pinyin: Wújiāpíng, "Wu Family Flatland" in the Liangshan area of Hanzhong, Shaanxi Province[2]) is an age or stage of the Permian. It is also the lower or earlier of two subdivisions of the Lopingian epoch or series. The Wuchiapingian spans the time between 259.9 ± 0.4 and 254.2 ± 0.1 million years ago (Ma). It was preceded by the Capitanian and followed by the Changhsingian.[3]
Regional stages with which the Wuchiapingian is coeval or overlaps include the Djulfian or Dzhulfian, Longtanian, Rustlerian, Saladoan, and Castilian.[4]
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Stratigraphic definitions [edit]
The Wuchiapingian was first used in 1962, when the Lopingian series of southwestern China was divided in the Changhsingian and Wuchiapingian Formations.[5] In 1973 the Wuchiapingian was first used as a chronostratigraphic unit (i.e. a stage, as opposed to a formation, which is a lithostratigraphic unit).[6]
The base of the Wuchiapingian stage is defined as the place in the stratigraphic record where the conodont species Clarkina postbitteri postbitteri first appears. A global reference profile for this boundary (a GSSP) is located near Laibin in the Chinese province of Guangxi.[7]
The top of the Wuchiapingian (the base of the Changhsingian) is at the first appearance of conodont species Clarkina wangi.
The Wuchiapingian contains two ammonite biozones: that of the genus Araxoceras and that of the genera Roadoceras and Doulingoceras.
Biodiversity [edit]
An extinction pulse occurred during the Wuchiapingian; faunas were recovering when another larger extinction pulse, the Permian-Triassic Extinction Event devastated life.[8]
References [edit]
Notes [edit]
- ^ "Chronostratigraphic chart 2013". ICS. Retrieved 27 March 2013.
- ^ 陕西汉中梁山吴家坪灰岩的再研究 (Restudies on the Wujiaping Limestone Liangshan of Hanzhong,Shaanxi)
- ^ See Gradstein et al. (2004) for a detailed geologic timescale
- ^ "Wuchiapingian" GeoWhen Database, International Commission on Stratigraphy (ICS), accessed 4 March 2010
- ^ By Sheng (1962)
- ^ The Wuchiapingian stage was first used by Kanmera & Nakazawa (1973)
- ^ The GSSP for the Wuchiapingian stage was established by Jin et al. (2006)
- ^ Sahney, S. and Benton, M.J. (2008). "Recovery from the most profound mass extinction of all time" (PDF). Proceedings of the Royal Society: Biological 275 (1636): 759. doi:10.1098/rspb.2007.1370. PMC 2596898. PMID 18198148.
Literature [edit]
- Gradstein, F.M.; Ogg, J.G. & Smith, A.G.; 2004: A Geologic Time Scale 2004, Cambridge University Press
- Jin, Y.; Shen, S.; Henderson, C.M.; Wang, X.; Wang, W.; Wang, Y.; Cao, C. & Shang, Q.; 2006: The Global Stratotype Section and Point (GSSP) for the boundary between the Capitanian and Wuchiapingian Stage (Permian)., Episodes 29(4), p. 253-262.
- Kanmera, K. and Nakazawa, K., 1973, Permian-Triassic relationships and faunal changes in the eastern Tethys, in Logan, A. and Hills, L.V., eds, The Permian and Triassic Systems and their mutual boundary: Canadian Society of Petroleum Geologists, Memoir 2, pp. 100–129.
External links [edit]
- GeoWhen Database - Wuchiapingian
- Upper Paleozoic stratigraphic chart at the website of the subcommission for stratigraphic information of the ICS
