Wuchiapingium

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system series step ≈ age ( mya )
higher higher higher younger
Perm Lopingium Changhsingium 251.9
⬍
254.2
Wuchiapingium 254.2
⬍
259.9
Guadalupium Capitanium 259.9
⬍
265.1
Wordium 265.1
⬍
268.8
Roadium 268.8
⬍
272.3
Cisuralium Kungurium 272.3
⬍
279.3
Artinskium 279.3
⬍
290.1
Sacmarium 290.1
⬍
295.5
Asselium 295.5
⬍
298.9
deeper deeper deeper older

The wuchiapingian (less often Wujiapingium) is in the Earth's lower chronostratigraphic stage of the Permian or Lopingium . In absolute numbers ( geochronologically ), the stage roughly covers the period from about 259.9 to about 254.2 million years. The Wuchiapingium follows the Capitanium and is replaced by the Changhsingium .

Naming and history

The name of the stage goes back to Sheng (1962) who divided the Lopingium into two formations: the Wuchiaping and the Changhsing Formation. Kanmera and Nakazawa (1973) then defined the Wuchiapingium as a chronostratigraphic unit. In 2004 the Wuchiapingium was decided and ratified by the International Commission on Stratigraphy (ICS) and the International Union of Geological Sciences (IUGS) as a global chronostratigraphic stage.

Definition and GSSP

The base of the Wuchiapingium is defined by the first appearance of the conodont species Clarkina postbitteri postbitteri . The end of the stage is marked with the first appearance of the conodont species Clarkina wangi . The reference profile ( GSSP ) of the Wuchiapingium, the Penglaitan profile ( Chinese  蓬莱 滩 剖面 ), is located in Laibin in the Guangxi Autonomous Region in southern China.

Breakdown

The Wuchiapingium is divided into two ammonite zones:

Lithostratigraphic units

The extent of the Zechstein Sea

In the Southern Alps and the Eastern Alps , the Val Gardena formation is deposited in the lower Wuchiapingium , followed by the Bellerophon formation in the upper Wuchiapingium . In Upper Austroalpine arising Salinar which later tectonically deformed to Haselgebirge , will form the slide face of the Eastern Alps ceilings. In addition, the terrestrial Rotliegend sedimentation in northern Central Europe is being replaced by the marine Zechstein sedimentation in the central Wuchiapingium . The copper slate of the base layers of the Zechstein comes from the Wuchiapingium.

Fossils

Typical fossils among the tetrapods for the Wuchiapingium are:

  • Aelurognathus

  • Clelandina rubidgei

  • Dinogorgon rubidgei

  • Gorgonops torvus

  • Inostrancevia

  • Intasuchus

  • Lycaenops

  • Pareiasaurus serridens

  • Pristerognathus vanderbyli

  • Procynosuchus delaharpeae

  • Rhinesuchus

  • Rubidgea atrox

  • Sauroctonus parringtoni

  • Scutosaurus

  • Sycosaurus laticeps

  • Youngina (skull)

literature

  • Felix Gradstein, Jim Ogg, Jim, Alan Smith: A Geologic timescale. Cambridge University Press, 2005, ISBN 0-521-78673-8 .
  • Yugan Jin , Shuzhong Shen, Charles M. Henderson, Xiangdong Wang, Wei Wang, Yue Wang, Changqun Cao, Qinghua Shang: The Global Stratotype Section and Point (GSSP) for the boundary between the Capitanian and Wuchiapingian Stage (Permian). In: Episodes. Volume 29, No. 4, Beijing 2006, pp. 253-262. ISSN  0705-3797 (PDF)

Web links