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

Research output: Contribution to journalDebate/Note/Editorial

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Challenges in defining the base of Cambrian Series 2 and Stage 3. / Zhang, Xingliang; Ahlberg, Per; Babcock, Loren E.; Choi, Duck K.; Geyer, Gerd; Gozalo, Rodolfo; Stewart Hollingsworth, J.; Li, Guoxiang; Naimark, Elena B.; Pegel, Tatyana V.; Steiner, Michael; Wotte, Thomas; Zhang, Zhifei.

In: Earth-Science Reviews, Vol. 172, 01.09.2017, p. 124-139.

Research output: Contribution to journalDebate/Note/Editorial

Harvard

Zhang, X, Ahlberg, P, Babcock, LE, Choi, DK, Geyer, G, Gozalo, R, Stewart Hollingsworth, J, Li, G, Naimark, EB, Pegel, TV, Steiner, M, Wotte, T & Zhang, Z 2017, 'Challenges in defining the base of Cambrian Series 2 and Stage 3', Earth-Science Reviews, vol. 172, pp. 124-139. https://doi.org/10.1016/j.earscirev.2017.07.017

APA

Zhang, X., Ahlberg, P., Babcock, L. E., Choi, D. K., Geyer, G., Gozalo, R., ... Zhang, Z. (2017). Challenges in defining the base of Cambrian Series 2 and Stage 3. Earth-Science Reviews, 172, 124-139. https://doi.org/10.1016/j.earscirev.2017.07.017

CBE

Zhang X, Ahlberg P, Babcock LE, Choi DK, Geyer G, Gozalo R, Stewart Hollingsworth J, Li G, Naimark EB, Pegel TV, Steiner M, Wotte T, Zhang Z. 2017. Challenges in defining the base of Cambrian Series 2 and Stage 3. Earth-Science Reviews. 172:124-139. https://doi.org/10.1016/j.earscirev.2017.07.017

MLA

Vancouver

Author

Zhang, Xingliang ; Ahlberg, Per ; Babcock, Loren E. ; Choi, Duck K. ; Geyer, Gerd ; Gozalo, Rodolfo ; Stewart Hollingsworth, J. ; Li, Guoxiang ; Naimark, Elena B. ; Pegel, Tatyana V. ; Steiner, Michael ; Wotte, Thomas ; Zhang, Zhifei. / Challenges in defining the base of Cambrian Series 2 and Stage 3. In: Earth-Science Reviews. 2017 ; Vol. 172. pp. 124-139.

RIS

TY - JOUR

T1 - Challenges in defining the base of Cambrian Series 2 and Stage 3

AU - Zhang, Xingliang

AU - Ahlberg, Per

AU - Babcock, Loren E.

AU - Choi, Duck K.

AU - Geyer, Gerd

AU - Gozalo, Rodolfo

AU - Stewart Hollingsworth, J.

AU - Li, Guoxiang

AU - Naimark, Elena B.

AU - Pegel, Tatyana V.

AU - Steiner, Michael

AU - Wotte, Thomas

AU - Zhang, Zhifei

PY - 2017/9/1

Y1 - 2017/9/1

N2 - 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.

AB - 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.

KW - Cambrian explosion

KW - Cambrian Series 2

KW - Cambrian Stage 3

KW - Chronostratigraphy

KW - GSSP

KW - Trilobites

U2 - 10.1016/j.earscirev.2017.07.017

DO - 10.1016/j.earscirev.2017.07.017

M3 - Debate/Note/Editorial

VL - 172

SP - 124

EP - 139

JO - Earth-Science Reviews

T2 - Earth-Science Reviews

JF - Earth-Science Reviews

SN - 1872-6828

ER -