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

doi:10.1016/j.earscirev.2017.07.017

	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; Hollingsworth, J. Stewart; Li, Guoxiang (李国祥); Naimark, Elena B; Pegel, Tatyana
	2017
发表期刊	Earth-Science Reviews
ISSN	0012-8252
卷号	172 页码:124-139
摘要	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.
关键词	GSSP Chronostratigraphy Cambrian explosion Trilobites Cambrian Series 2 Cambrian Stage 3
DOI	10.1016/j.earscirev.2017.07.017
收录类别	SCI
语种	英语
WOS研究方向	Geology
WOS类目	Geosciences, Multidisciplinary
WOS记录号	WOS:000412257300007
出版者	ELSEVIER SCIENCE BV
文献类型	期刊论文
条目标识符	http://ir.nigpas.ac.cn/handle/332004/14075
专题	中国科学院南京地质古生物研究所其他
通讯作者	Zhang, Xingliang
推荐引用方式 GB/T 7714	Zhang, Xingliang,Ahlberg, Per,Babcock, Loren E.,et al. Challenges in defining the base of Cambrian Series 2 and Stage 3[J]. Earth-Science Reviews,2017,172:124-139.
APA	Zhang, Xingliang.,Ahlberg, Per.,Babcock, Loren E..,Choi, Duck K..,Geyer, Gerd.,...&Pegel, Tatyana.(2017).Challenges in defining the base of Cambrian Series 2 and Stage 3.Earth-Science Reviews,172,124-139.
MLA	Zhang, Xingliang,et al."Challenges in defining the base of Cambrian Series 2 and Stage 3".Earth-Science Reviews 172(2017):124-139.