Cambrian Stage 2

Short description: Second and last age of the Terreneuvian Epoch

Cambrian Stage 2

~529 – ~521 Ma

PreЄ

Chronology

Cambrian graphical timeline

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-535 --

-530 --

-525 --

-520 --

-515 --

-510 --

-505 --

-500 --

-495 --

-490 --

-485 --

Ediacaran

Fortunian

"Stage 2"

"Stage 3"

"Stage 4"

Wuliuan

Drumian

Guzhangian

Paibian

Jiangshanian

"Stage 10"

Tremadocian

Orsten Fauna

Burgess Shale

Kaili biota

Archaeocyatha extinction

Emu Bay Shale

Sirius Passet biota

Chengjiang biota

First Trilobites

SSF diversification, first brachiopods & archaeocyatha

First halkieriids, mollusсs, hyoliths SSF

Baykonurian glaciation

Dresbachian extinction

Major Glacial period

Subdivision of the Cambrian according to the ICS, as of 2021.[1]
Vertical axis scale: millions of years ago

Etymology
Name formality| Informal
Usage information
Celestial body| Earth
Regional usage| Global (ICS)
Time scale(s) used| ICS Time Scale
Definition
Chronological unit| Age
Stratigraphic unit| Stage
Time span formality| Formal
Lower boundary definition| Not formally defined
Lower boundary definition candidates| First appearance of small shelly fauna or Archaeocyathids
Lower boundary GSSP candidate section(s)| None
GSSP ratified| Template:Period start ratification
Upper boundary definition| Not formally defined
Upper boundary definition candidates| FAD of Trilobites
Upper boundary GSSP candidate section(s)| None
GSSP ratified| Template:Period end ratification

Stage 2 of the Cambrian is the unnamed upper stage of the Terreneuvian Series. It lies atop the Fortunian and below Stage 3 of the Cambrian. It is commonly referred to as the Tommotian, after the Cambrian stratigraphy of Siberia.[2][3] Neither the upper nor lower boundary has yet been defined by the International Commission on Stratigraphy.[4][5] The preferred definitions for the lower boundary are the first appearance of the molluscs Watsonella crosbyi or Aldanella attleborensis around 529 million years ago.[6][7] The correlation between the lowest occurrences of A. attleborensis and W. crosbyi with the Zhujiaqing positive carbon isotope excursion (ZHUCE) has led to the conclusion that the combination of these two markers are a reliable indicator of the boundary between the Fortunian and Stage 2.[8] The proposed upper boundary might be the first appearance of trilobites around 521 million years ago.[4]

## Contents

* 1 Naming
* 2 Stratotype
* 3 References
* 4 External links

## Naming

The name "Laolinian" after the Laolin village in Yunnan, China, was proposed for the Stage 2 in 2012.[9]

## Stratotype

Possible candidates for a GSSP include the first appearance of Watsonella crosbyi in the Zhujiaqing Formation (朱家庆组) in Yunnan, China or the Pestrotsvet Formation near the Aldan River on the Siberian Platform.[10]

## References

1. ↑ "Chart/Time Scale". International Commission on Stratigraphy. http://www.stratigraphy.org/index.php/ics-chart-timescale.
2. ↑ Kouchinsky, Artem; Bengtson, Stefan; Missarzhevsky, Vladimir V.; Pelechaty, Shane; Torssander, Peter; Val'kov, Anatolij K. (24 September 2001). "Carbon isotope stratigraphy and the problem of a pre-Tommotian stage in Siberia". Geological Magazine 138 (4): 387–396. doi:10.1017/S0016756801005684. Bibcode: 2001GeoM..138..387K.
3. ↑ Landing, E.; Kouchinsky, A. V. (2016). "Correlation of the Cambrian Evolutionary Radiation: geochronology, evolutionary stasis of earliest Cambrian (Terreneuvian) small shelly fossil (SSF) taxa, and chronostratigraphic significance". Geol. Mag. 153 (4): 750–756. doi:10.1017/s0016756815001089. Bibcode: 2016GeoM..153..750L. https://www.researchgate.net/publication/291970287.
4. ↑ 4.0 4.1 "GSSP List ICS". ICS. http://www.stratigraphy.org/GSSP/index.html.
5. ↑ P. Yu. Parkhaev, Yu. E. Demidenko, M. A. Kulsha (2020). "Zooproblematica Mobergella radiolata as Index Species of the Lower Cambrian Stage Units". Стратиграфия. Геологическая корреляция 28 (2): 34. doi:10.31857/S0869592X20020064. http://csl.isc.irk.ru/bd/Журналы/Стратиграфия. Геологическая корреляция 2020 Т28/№ 2/33-54.pdf#page=2.
6. ↑ "ISCS Working Groups: Working Group on the Stage 2 GSSP". International Subcommission on Cambrian Stratigraphy. http://www.palaeontology.geo.uu.se/ISCS/ISCS_working_groups.html#2.
7. ↑ Yaqin Qiang, Junfeng Guo, Guoxiang Li, Zuchen Song, Jiaxin Peng, Jie Sun, Jian Han, Zhifei Zhang (2023). "Aldanella attleborensis (Mollusca) from Cambrian Stage 2 of the Three Gorges Area and Its Stratigraphic Implications". Biology 12 (2): 1—21. doi:10.3390/biology12020261. PMID 36829538. PMC 9953005. https://www.researchgate.net/publication/368377357.
8. ↑ Yang, Chuan; Bowyer, Fred T.; Condon, Daniel J.; Li, Xian-Hua; Zhu, Maoyan (15 April 2023). "New U-Pb age from the Shuijingtuo Formation (Yangtze Gorges area) and its implications for the Cambrian timescale". Palaeogeography, Palaeoclimatology, Palaeoecology 616. doi:10.1016/j.palaeo.2023.111477. ISSN 0031-0182. Bibcode: 2023PPP...61611477Y. https://www.sciencedirect.com/science/article/pii/S0031018223000950. Retrieved 2024-03-26.
9. ↑ Ed Landing, Gerd Geyer, Adam C. Maloof, Martin B. Brasier, Samuel A. Bowring (2013). "Proposal of the global stratotype section and point for the Laolinian Stage (=informal Cambrian Stage 2) as the upper stage of the Terreneuvian Series". International Cambrian Subcommission: 1—43. doi:10.13140/RG.2.1.4198.1842. https://www.researchgate.net/publication/300117138.
10. ↑ Li, Guoxiang; Zhao, Xin; Gubanov, Alexander; Zhu, Maoyan; Na, Lin (1 April 2011). "Early Cambrian Mollusc Watsonella crosbyi: A Potential GSSP Index Fossil for the Base of the Cambrian Stage 2". Acta Geologica Sinica - English Edition 85 (2): 309–319. doi:10.1111/j.1755-6724.2011.00400.x. Bibcode: 2011AcGlS..85..309L.

## External links

* "GSSP Table - Paleozoic Era". Geologic Timescale Foundation. https://timescalefoundation.org/gssp/index.php?parentid=77.
* "GSSPs - The Cambrian System 2019". International Commission on Stratigraphy. http://www.palaeontology.geo.uu.se/ISCS/ISCS_GSSPs.html.

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* Cisuralian (272.3–298.9 Mya)

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Carboniferous (298.9–358.9 Mya)|

* Pennsylvanian (298.9–323.2 Mya)
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Ordovician (443.8–485.4 Mya)|

* Late (443.8–458.4 Mya)
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Cambrian (485.4–541.0 Mya)|

* Furongian (485.4–497 Mya)
* Miaolingian (497–509 Mya)
* Series 2 (509–521 Mya)
* Terreneuvian (521–541.0 Mya)

Proterozoic eon
(541.0 Mya–2.5 Gya)|

| Neoproterozoic (541.0 Mya–1 Gya)|

* Ediacaran (541.0–~635 Mya)
* Cryogenian (~635–~720 Mya)
* Tonian (~720 Mya–1 Gya)

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Mesoproterozoic (1–1.6 Gya)|

* Stenian (1–1.2 Gya)
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Archean eon (2.5–4 Gya)|

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* Neoarchean (2.5–2.8 Gya)
* Mesoarchean (2.8–3.2 Gya)
* Paleoarchean (3.2–3.6 Gya)
* Eoarchean (3.6–4 Gya)

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Hadean eon (4–4.6 Gya)|

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kya = thousands years ago. Mya = millions years ago. Gya = billions years ago.
See also: Geologic time scale

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