Wuliuum

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system series step ≈ age ( mya )
higher higher higher younger
Cambrian Furongium 10th stage 485.4
⬍
489.5
Jiangshanium 489.5
⬍
494
Paibium 494
⬍
497
Miaolingium Guzhangium 497
⬍
500.5
Drumium 500.5
⬍
504.5
Wuliuum 504.5
⬍
509
2nd series 4th stage 509
⬍
514
3rd stage 514
⬍
521
Terreneuvium 2nd stage 521
⬍
529
Fortunium 529
⬍
541
deeper

The Wuliuum is the lowest of the three stages of the Miaolingium , the third series of the Cambrian . It corresponds to the period from 509 to 504.5 million years ago. It follows the informal 4th stage of the Cambrian and precedes the drumium .

Naming and history

The stage is named after Mount Wuliu in the Miaoling Mountains in southern China's Guizhou Province , where its GSSP (see below) is located. It was formally defined in 2018.

Definition and GSSP

The lower limit of the level is defined by the first appearance of the trilobite species Oryctocephalus indicus . As GSSP one near the village Balang in the circuit serves Jianhe in the province of Guizhou , China , open-minded layer sequence ( "Wuliu-Zengjiayan profile") of the Kaili Formation . The boundary to the drumium is indicated by the first appearance of the agnostoid trilobite species Ptychagnostus atavus .

literature

  • Zhao Yuanlong, Yuan Jinliang, Loren E. Babcock, Guo Qingjun, Peng Jin, Yin Leiming, Yang Xinglian, Wang Chunjiang, Robert R. Gaines, Jorge Esteve, Yang Ruidong, Yang Yuning, Sun Haijing, Tai Tongsu: Proposed Global Standard Stratotype -Section and Point for the Base of the Miaolingian Series and Wuliuan Stage (Replacing provisional Cambrian Series 3 and Stage 5). Working Group on the Stage 3 GSSP, International Subcommission on Cambrian Stratigraphy, 2018 ( PDF 5.25 MB).
  • Shanchi Peng, Loren E. Babcock, Roger A. Cooper: The Cambrian Period. Pp. 437-488 in: Felix M. Gradstein, James G. Ogg, Mark Schmitz, Gabi Ogg: The Geologic Time Scale 2012. Volume 2. Elsevier 2012, ISBN 978-0-44-459434-1 .

Individual evidence

  1. ^ Subcommission on Cambrian stratigraphy. Annual Report 2018. International Commission on Stratigraphy (ICS) ( PDF 262 kB), p. 2

Web links