Miaolingian

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Key events in the Cambrian
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-540 —
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Orsten Fauna
Archaeocyatha extinction
SSF diversification, first brachiopods & archaeocyatha
Treptichnus pedum trace
Large negative peak δ 13Ccarb excursion
First Cloudina & Namacalathus mineral tubular fossils
Stratigraphic scale of the ICS subdivisions and Precambrian/Cambrian boundary.


The Miaolingian is the third Series of the Cambrian period, and was formally named in 2018.[1] It lasted from about 509 to 497 million years ago and is divided into 3 stages: the Wuliuan, the Drumian, and the Guzhangian. The Miaolingian is preceded by also unnamed Cambrian Series 2 and succeeded by the Furongian series.[2]

Definition[edit]

The lower boundary of the Mioalingian has the same definition as that of the Wuliuan. This boundary was formally defined by the ICS in 2018.

A number of proposals for fossils and type sections were made. The most promising fossil markers were seen to be the respective first appearances of either trilobite species Ovatoryctocara granulata or Oryctocephalus indicus.[3] Either species should have an age close to 509.[2] 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.[2]

Subdivision[edit]

The Miaolingian is subdivided into the following stages:[2]

Epoch Stage Age (mya)
Furongian
Stage 10 489.5
Jiangshanian 494
Paibian 497
Miaolingian
Guzhangian 500.5
Drumian 504.5
Wuliuan 509
Series 2
Stage 4 514
Stage 3 521

References[edit]

  1. ^ http://www.stratigraphy.org/ICSchart/ChronostratChart2018-08.pdf
  2. ^ a b c d "GSSP Table - Paleozoic Era". Retrieved 15 November 2012. 
  3. ^ Gozalo, Rodolfo; Álvarez, María Eugenia Dies; Vintaned, José Antonio Gámez; Zhuravlev, Andrey Yu.; Bauluz, Blanca; Subías, Ignacio; Chirivella Martorell, Juan B.; Mayoral, Eduardo; Gursky, Hans-Jürgen; Andrés, José Antonio; Liñán, Eladio (1 December 2011). "Proposal of a reference section and point for the Cambrian Series 2-3 boundary in the Mediterranean subprovince in Murero (NE Spain) and its intercontinental correlation". Geological Journal. 48: 142–155. doi:10.1002/gj.1330.