The Relationship between the ＂Green-Bean Rock＂ Layers and Conodont Chiosella timorensis and Implications on Defining the Early-Middle Triassic Boundary in the Nanpanjiang Basin, South China

The Triassic ＂Green-bean Rock＂ （GBR） layers were widely recognized around the Early-Middle Triassic boundary interval in the Nanpanjiang Basin, South China. To determine the precise relationship between the GBR layers and the first appearance datum （FAD） of the conodont Chiosella timorensis, four Lo...

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Bibliographic Details
Published in:Journal of earth science (Wuhan, China) China), 2015-04, Vol.26 (2), p.236-245
Main Authors: Yan, Chunbo, Jiang, Haishui, Lai, Xulong, Sun, Yadong, Yang, Bo, Wang, Lina
Format: Article
Language:English
Subjects:
Basins
Biogeosciences
Boundaries
China
Correlation
Earth and Environmental Science
Earth science
Earth Sciences
GBR
Geochemistry
Geological time
Geology
Geotechnical Engineering & Applied Earth Sciences
Intervals
Markers
Recognition
Rock
Rocks
Stratigraphy
Temporal logic
Triassic
中三叠统
中国南方
南盘江流域
定义
牙形石
生物地层
界线
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Summary:The Triassic ＂Green-bean Rock＂ （GBR） layers were widely recognized around the Early-Middle Triassic boundary interval in the Nanpanjiang Basin, South China. To determine the precise relationship between the GBR layers and the first appearance datum （FAD） of the conodont Chiosella timorensis, four Lower-Middle Triassic sections from the Nanpanjiang Basin, including the Gaimao, Bianyang lI, Zuodeng and Wantou sections have been studied in detail. Detailed conodont biostratigraphy convinces us that there is no exact temporal relationship between the GBR layers and first occurrence of Ch. timorensis. Moreover, the numbers of the GBR layers are different from the place to place within the Nanpanjiang Basin, and the time span of the GBR layers was much longer than previously estimated. Global correlations show that the FAD of Ch. timorensis is contemporaneous basinwide and worldwide and more suitable marker defining the Olenekian-Anisian boundary （Early-Middle Triassic boundary） than any other proxies.
ISSN:1674-487X
1867-111X
DOI:10.1007/s12583-015-0535-x