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Cambrian Stage 2

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Title: Cambrian Stage 2  
Author: World Heritage Encyclopedia
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Subject: Cambrian Stage 3, Terreneuvian, Cambrian, Archean, Precambrian
Collection: Cambrian, Cambrian Geochronology, Geological Ages, Stratigraphy
Publisher: World Heritage Encyclopedia

Cambrian Stage 2

Stage 2 of the Cambrian is the unnamed upper stage of the Terreneuvian series. It lies on top of the Fortunian and below Stage 3 of the Cambrian. It is commonly referred to as the Tommotian, after the Cambrian stratigraphy of Siberia.[1] Both the upper and lower boundary have not been clearly defined yet by the International Commission on Stratigraphy.[2] Proposals for the lower boundary are the appearance of Small Shelly Fossils, an archaeocyathid species or the mollusc Watsonella crosbyi around ~529 million years ago.[2] The proposed upper boundary might be the first appearance of trilobites around ~521 million years ago.[2]

Possible candidates for a GSSP include the first appearance of Watsonella crosbyi in the Zhujiaqing Formation in Yunnan, China or the Pestrotsvet Formation near the Aldan River on the Siberian Platform.[3]


  1. ^ 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).  
  2. ^ a b c "GSSP List ICS". ICS. Retrieved 9 November 2012. 
  3. ^ 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.  

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