Changhsingian


Changhsingian
System Series Stage Age (Ma)
Triassic Lower Induan younger
Permian Lopingian Changhsingian 251.0–253.8
Wuchiapingian 253.8–260.4
Guadalupian Capitanian 260.4–265.8
Wordian 265.8–268.0
Roadian 268.0–270.6
Cisuralian Kungurian 270.6–275.6
Artinskian 275.6–284.4
Sakmarian 284.4–294.6
Asselian 294.6–299.0
Carboniferous Pennsylvanian Gzhelian older
Subdivision of the Permian system according to the IUGS, as of July 2009.

In the geologic timescale, the Changhsingian or Changxingian (from Chinese: 长兴县, Pinyin: Chángxìng Xiàn, "Changxing County") is the latest age or uppermost stage of the Permian. It is also the upper or latest of two subdivisions of the Lopingian epoch or series. The Changhsingian lasted from 253.8 ± 0.7 to 251.0 ± 0.7 million years ago (Ma). It was preceded by the Wuchiapingian and followed by the Induan.[1]

The greatest mass extinction event in the Phanerozoic eon occurred during this age. The extinction rate peaked about a million years before the end of this stage.

Contents

Stratigraphic definitions

The Changhsingian is named after Changxing County in China (Wades-Giles transcription: Ch’ang-hsing). The stage was named for the Changhsing Limestone.[2] The name was first used for a stage in 1970[3] and was anchored in the international timescale in 1981.[4]

The base of the Changhsingian stage is at the first appearance of conodont species Clarkina wangi. The global reference profile is profile D at Meishan, in the type area in Changxing.[4] The top of the Changhsingian (the base of the Induan stage and the Triassic system is at the first appearance of conodont species Hindeodus parvus.

The Changhsingian stage contains only one ammonite biozone: that of the genus Iranites.

Palaeontology

The Changhsingian ended with the Permian-Triassic Extinction Event when both global biodiversity and alpha diversity (community-level diversity) were devastated[5]. The world after the extinction was almost lifeless, deserted, hot, and dry. Ammonites, fishes, insects, and the tetrapods (cynodonts, amphibians, reptiles, etc.) remained rare and terrestrial ecosystems did not recover for 30M years[5].

References

Notes

  1. ^ See Gradstein et al. (2004) for a detailed geologic timescale
  2. ^ The Changhsing Limestone was named by Grabau (1923)
  3. ^ By Furnish & Glenister (1970); see also Furnish & Glenister (1973)
  4. ^ a b The Changhsingian stage and its GSSP were described by Jin et al. (1981)
  5. ^ a b 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): 759–65. doi:10.1098/rspb.2007.1370. PMC 2596898. PMID 18198148. http://journals.royalsociety.org/content/qq5un1810k7605h5/fulltext.pdf. 

Literature

  • Furnish, W.M. & Glenister, B.F.; 1970: Permian ammonite Cyclolobus from the Salt Range, West Pakistan, in: Kummel, B. & Teichert, G. (eds.): Stratigraphic boundary problems, Permian and Triassic of west Pakistan, Geological Department of Kansas University, Special Publication 4, pp 158–176.
  • Furnish, W.M. & Glenister, B.F.; 1973: Permian stages names, in: Logan, A. & Hills, L.V.: The Permian and Triassic systems and their mutual boundary, Canadian Society of Petroleum Geologists Memoir 2, pp 522–548.
  • Grabau, A.W.; 1923: Stratigraphy of China, Part 1: Palaeozoic and lower, Geological Survey of China, 529 pp.
  • Gradstein, F.M.; Ogg, J.G. & Smith, A.G.; 2004: A Geologic Time Scale 2004, Cambridge University Press
  • Jin, Y.; Wang, Y.; Henderson, C.; Wardlaw, B.R.; Shen, S. & Cao, C.; 2006: The Global Boundary Stratotype Section and Point (GSSP) for the base of Changhsingian Stage (Upper Permian) Episodes 29(3), p. 175-182, PDF.

External links


Wikimedia Foundation. 2010.

Look at other dictionaries:

  • Permian Period — Interval of geologic time, 290–248 million years ago. The last of the six periods of the Paleozoic Era, it follows the Carboniferous Period. During the Permian, the continents joined to form a single supercontinent, Pangea. Hot, dry conditions… …   Universalium

  • Geologic time scale — This clock representation shows some of the major units of geological time and definitive events of Earth history. The Hadean eon represents the time before fossil record of life on Earth; its upper boundary is now regarded as 4.0 Ga.[1] Other… …   Wikipedia

  • Permian — For the language family, see Permic languages. For the high school, see Permian High School. For the geological basins, see Permian Basin. Permian Period 299–251 million years ago …   Wikipedia

  • Mesoproterozoic — era 1600   1000 million years ago Key events in the Mesoproterozoic view • edit …   Wikipedia

  • Norian — System Series Stage Age (Ma) Jurassic Lower Hettangian younger Triassic Upper …   Wikipedia

  • Olenekian — System Series Stage Age (Ma) Jurassic Lower Hettangian younger Triassic Upper …   Wikipedia

  • Middle Triassic — System Series Stage Age (Ma) Jurassic Lower Hettangian younger Triassic Upper …   Wikipedia

  • Changhsingium — System Serie Stufe ≈ Alter (mya) höher höher höher jünger Perm Lopingium Changhsingium …   Deutsch Wikipedia

  • Geology of the North Sea — Contents 1 Tectonic structure 2 Precambrian 3 Finnmarkian, Athollian, Caledonian Orogenies …   Wikipedia

  • Cambrian — For other uses, see Cambrian (disambiguation). Cambrian Period 542–488.3 million years ago …   Wikipedia


Share the article and excerpts

Direct link
Do a right-click on the link above
and select “Copy Link”

We are using cookies for the best presentation of our site. Continuing to use this site, you agree with this.