Miaolingian

Source: Wikipedia, the free encyclopedia.
Miaolingian
~506.5 – ~497 Ma
hyoliths SSF
←
←
Dresbachian extinction
Subdivision of the Cambrian according to the
EpochStratigraphic unitSeriesTime span formalityFormalLower boundary definitionFAD of the Trilobite Oryctocephalus indicus.Lower boundary GSSPWuliu-Zengjiayan, Guizhou, China
26°44.843′N 108°24.830′E / 26.747383°N 108.413833°E / 26.747383; 108.413833Lower GSSP ratified2018[2]Upper boundary definitionFAD of the Trilobite Glyptagnostus reticulatusUpper boundary GSSPPaibi section, Paibi, Hunan, China
28°23.37′N 109°31.54′E / 28.38950°N 109.52567°E / 28.38950; 109.52567Upper GSSP ratified2003[3]

The Miaolingian is the third Series of the Cambrian Period, and was formally named in 2018.[4] It lasted from about 506.5 to 497 million years ago and is divided in ascending order into 3 stages: the Wuliuan, Drumian, and Guzhangian. The Miaolingian is preceded by the unnamed Cambrian Series 2 and succeeded by the Furongian series.[5]

It is named after the Miaoling Mountains in southeastern Guizhou Province, China.[2]

Definition

A number of proposals for fossils and type sections were made before it was formally ratified in 2018. The most promising fossil markers were seen to be the respective first appearances of either trilobite species Ovatoryctocara granulata or Oryctocephalus indicus,[6] which both have an age close to 506.5 million years ago.[5] After some deliberation, the FAD of Oryctocephalus indicus was chosen to be the lower boundary marker, and the GSSP was placed in the Kaili Formation, Wuliu-Zengjiayan, Guizhou, China.[2][7]

The Miaolingian-Furongian boundary has the same definition as the Paibian Stage. It is defined as the first appearance of Glyptagnostus reticulatus around 497 million years ago.[5]

Subdivision

The Miaolingian is subdivided into the following stages:[5]

Epoch / Series Age / Stage Age lower boundary (mya)
Furongian
Stage 10 491
Jiangshanian 494.2
Paibian 497
Miaolingian
Guzhangian 500.5
Drumian 504.5
Wuliuan 506.5
Series 2
Stage 4 514.5
Stage 3 521

The Ordian stage, which is use in Australian chronostratigraphical scale, was originally supposed to be the lowest stage of the Miaolingian, but may belong to upper Series 2. As of 2024, the base of the Ordian is not defined yet.[8]

Major events

At the Cambrian Series 2–Miaolingian boundary, the first major trilobite extinction, known as the Olenellid Biomere boundary, occurred. In particular, trilobites of the families Ollenellidae and Redlichiidae have been extinct in Laurentia and South China, respectively.[9] The first O. indicus appear after this global extinction, and in areas where O. indicus fossils are absent, the Series 2–Miaolingian boundary is determined by chemostratigraphic data.[10]

Paleontology

Benthic

Rhabdopleuridae and erect growing branching colonies of the Dithecodendridae families evolved already at the beginning of the Miaolingian. The most common Wuliuan graptolite genus is Sphenoecium, whose robust colonies were found all over the world.[11]

References

  1. ^ "International Chronostratigraphic Chart" (PDF). International Commission on Stratigraphy. December 2024. Retrieved January 2, 2025.
  2. ^
    doi:10.18814/epiiugs/2019/019013. Archived
    (PDF) from the original on 2022-03-04. Retrieved 19 March 2024.
  3. doi:10.1080/00241160410002081. Archived
    from the original on 2023-07-21. Retrieved 19 March 2024.
  4. ^ "International Chronostratigraphic Chart (2018)" (PDF). Archived from the original (PDF) on 2018-09-07. Retrieved 2024-03-19.
  5. ^ a b c d "GSSP Table - Paleozoic Era". Archived from the original on 2023-10-08. Retrieved 2024-03-19.
  6. S2CID 129084517
    .
  7. doi:10.1080/11035897.2019.1621374
    .
  8. doi:10.1080/03115518.2024.2327045.{{cite journal}}: CS1 maint: multiple names: authors list (link
    )
  9. PMID 31758094.{{cite journal}}: CS1 maint: multiple names: authors list (link
    )
  10. ^ Courtney Birksmith, Glenn A. Brock, Marissa J. Betts, James D. Holmes, Zhiliang Zhang (2023). "Chronostratigraphy of the Cambrian Series 2 -Miaolingian boundary, western Stansbury Basin, South Australia". Conference: Palaeo Down Under 3 at Perth, Western Australia.{{cite web}}: CS1 maint: multiple names: authors list (link)
  11. doi:10.1007/s12549-023-00595-x
    .


Stub icon

This geochronology article is a stub. You can help Wikipedia by expanding it.

period is a stub. You can help Wikipedia by expanding it.

Retrieved from "https://en.wikipedia.org/w/index.php?title=Miaolingian&oldid=1269719951"