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Challenges in defining the base of Cambrian Series 2 and Stage 3

Zhang, Xingliang; Ahlberg, Per LU ; Babcock, Loren E. LU ; Choi, Duck K.; Geyer, Gerd; Gozalo, Rodolfo; Stewart Hollingsworth, J.; Li, Guoxiang; Naimark, Elena B. and Pegel, Tatyana V., et al. (2017) In Earth-Science Reviews 172. p.124-139
Abstract

Formal subdivision of the Cambrian System into four series and ten stages is in progress. The base of Cambrian Stage 3 (provisional), which is conterminous with the base of Cambrian Series 2 (provisional), is expected to be placed at a horizon close to the first appearance of trilobites, which marks the onset of the largest phase of the Cambrian explosion. Conceptually, an ideal boundary position would be marked by a significant and globally recognizable bioevent that divides the lower part of the Cambrian System into a sub-trilobitic Terreneuvian Series and a trilobite-dominated Series 2. If the level is to be identified principally through biostratigraphic means, its position also needs to be recognizable using non-biostratigraphic... (More)

Formal subdivision of the Cambrian System into four series and ten stages is in progress. The base of Cambrian Stage 3 (provisional), which is conterminous with the base of Cambrian Series 2 (provisional), is expected to be placed at a horizon close to the first appearance of trilobites, which marks the onset of the largest phase of the Cambrian explosion. Conceptually, an ideal boundary position would be marked by a significant and globally recognizable bioevent that divides the lower part of the Cambrian System into a sub-trilobitic Terreneuvian Series and a trilobite-dominated Series 2. If the level is to be identified principally through biostratigraphic means, its position also needs to be recognizable using non-biostratigraphic means, and its correlation potential should be tested through detailed investigation of several continuous successions embracing the critical interval. Major difficulties in identifying a suitable horizon include strong biotic provincialism, a plethora of regional unconformities, and facies changes on different paleocontinents in the Cambrian Terreneuvian–Series 2 boundary interval. Levels that provide potential for intercontinental correlation include the first appearance position of trilobites and the approximately equivalent first appearance positions of certain small shelly fossil and acritarch species. In addition, a non-biostratigraphic marker, such as a stable carbon isotopic excursion, may be useful as a correlation level. Cambrian Series 2 and Stage 3 are provisional stratigraphic units, and their conterminous base was previously suggested to coincide to the appearance of trilobites. Compared to other potential chronostratigraphic indicators, the first appearance of trilobites still has advantages for recognizing and correlating the base of Stage 3, and should remain as the provisional primary marker for the boundary position.

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publication status
published
subject
keywords
Cambrian explosion, Cambrian Series 2, Cambrian Stage 3, Chronostratigraphy, GSSP, Trilobites
in
Earth-Science Reviews
volume
172
pages
16 pages
publisher
Elsevier
external identifiers
  • scopus:85026775886
ISSN
0012-8252
DOI
10.1016/j.earscirev.2017.07.017
language
English
LU publication?
yes
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95a58cee-40e8-49f7-844f-f85d80eb960b
date added to LUP
2017-08-29 11:36:16
date last changed
2017-08-29 11:36:16
@misc{95a58cee-40e8-49f7-844f-f85d80eb960b,
  abstract     = {<p>Formal subdivision of the Cambrian System into four series and ten stages is in progress. The base of Cambrian Stage 3 (provisional), which is conterminous with the base of Cambrian Series 2 (provisional), is expected to be placed at a horizon close to the first appearance of trilobites, which marks the onset of the largest phase of the Cambrian explosion. Conceptually, an ideal boundary position would be marked by a significant and globally recognizable bioevent that divides the lower part of the Cambrian System into a sub-trilobitic Terreneuvian Series and a trilobite-dominated Series 2. If the level is to be identified principally through biostratigraphic means, its position also needs to be recognizable using non-biostratigraphic means, and its correlation potential should be tested through detailed investigation of several continuous successions embracing the critical interval. Major difficulties in identifying a suitable horizon include strong biotic provincialism, a plethora of regional unconformities, and facies changes on different paleocontinents in the Cambrian Terreneuvian–Series 2 boundary interval. Levels that provide potential for intercontinental correlation include the first appearance position of trilobites and the approximately equivalent first appearance positions of certain small shelly fossil and acritarch species. In addition, a non-biostratigraphic marker, such as a stable carbon isotopic excursion, may be useful as a correlation level. Cambrian Series 2 and Stage 3 are provisional stratigraphic units, and their conterminous base was previously suggested to coincide to the appearance of trilobites. Compared to other potential chronostratigraphic indicators, the first appearance of trilobites still has advantages for recognizing and correlating the base of Stage 3, and should remain as the provisional primary marker for the boundary position.</p>},
  author       = {Zhang, Xingliang and Ahlberg, Per and Babcock, Loren E. and Choi, Duck K. and Geyer, Gerd and Gozalo, Rodolfo and Stewart Hollingsworth, J. and Li, Guoxiang and Naimark, Elena B. and Pegel, Tatyana V. and Steiner, Michael and Wotte, Thomas and Zhang, Zhifei},
  issn         = {0012-8252},
  keyword      = {Cambrian explosion,Cambrian Series 2,Cambrian Stage 3,Chronostratigraphy,GSSP,Trilobites},
  language     = {eng},
  month        = {09},
  pages        = {124--139},
  publisher    = {Elsevier},
  series       = {Earth-Science Reviews},
  title        = {Challenges in defining the base of Cambrian Series 2 and Stage 3},
  url          = {http://dx.doi.org/10.1016/j.earscirev.2017.07.017},
  volume       = {172},
  year         = {2017},
}