Miaolingium

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 Miaolingium is the third series of the Cambrian on the global geological time scale . It corresponds to the period from 509 to 497 million years ago. It follows the informal 2nd series of the Cambrian and precedes the Furongian .

Naming and history

The series is named after the Miaoling Mountains in the southern Chinese province of Guizhou . It was formally defined in 2018 as the third series of the four-part Cambrian since the mid-2000s and roughly corresponds to the Central Cambrian of the traditional three-part Cambrian.

Definition and GSSP

The lower limit of the series is defined by the first appearance of the trilobite species Oryctocephalus indicus . The GSSP of the Miaolingium series (and the Wuliuum stage) is a sequence of layers (“Wuliu-Zengjiayan profile”) of the Kaili formation that is open to the world near the village of Balang in Jianhe County in Guizhou Province , China . The boundary to the furongium is indicated by the first appearance of the agnostoid trilobite species Glyptagnostus reticulatus .

Breakdown

The miaolingium is divided into three chronostratigraphic levels :

• System : Cambrian (541-485.4  mya )
  • Series : Furongium (497-485.4 mya)
  • Series: Miaolingium (509–497 mya)
    • Level : Guzhangium (500.5–497 mya)
    • Stage: Drumium (504.5 to 500.5 mya)
    • Level: Wuliuum (509–504.5 mya)
  • Series: Cambrian 2nd series (521–509 mya)
  • Series: Terreneuvium (541–521 mya)

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
2. ↑ Shanchi Peng, Loren E. Babcock: Continuing progress on chronostratigraphic subdivision of the Cambrian System. Bulletin of Geosciences. Vol. 86, No. 3, 2011, pp. 391–396 ( PDF 555 kB)

Web links

• International Chronostratigraphic Chart 2018 (PDF)