A negative carbon isotope excursion defines the boundary from Cambrian Series 2 to Cambrian Series 3 on the Yangtze Platform, South China

2010 ◽  
Vol 285 (3-4) ◽  
pp. 143-151 ◽  
Author(s):  
Qingjun Guo ◽  
Harald Strauss ◽  
Congqiang Liu ◽  
Yuanlong Zhao ◽  
Xinglian Yang ◽  
...  
2007 ◽  
Vol 261 (1-2) ◽  
pp. 303-320 ◽  
Author(s):  
Ganqing Jiang ◽  
Alan J. Kaufman ◽  
Nicholas Christie-Blick ◽  
Shihong Zhang ◽  
Huaichun Wu

Geology ◽  
2020 ◽  
Vol 48 (7) ◽  
pp. 708-712
Author(s):  
Dmitriy Grazhdankin ◽  
Konstantin Nagovitsin ◽  
Elena Golubkova ◽  
Galina Karlova ◽  
Boris Kochnev ◽  
...  

Abstract Large (100 to ∼700 µm diameter) spheroidal carbonaceous microfossils ornamented with regularly arranged spinose or branched processes are globally distributed in the Ediacaran (635–542 Ma). These microfossils, collectively known as the Doushantuo-Pertatataka–type acanthomorphs, have been variously interpreted as a polyphyletic assortment of resting stages of eukaryotes, including animals. The stratigraphic range of the acanthomorphs has long been thought to be restricted to the interval between the uppermost Cryogenian glacial deposits and the largest-known carbon isotope excursion in Earth’s history, the Shuram event. The mid-Ediacaran disappearance of the acanthomorphs was puzzling until they were discovered in younger strata in south China, in northwestern Russia, and in Mongolia. Here, we report Doushantuo-Pertatataka–type acanthomorphs coeval with Cambrian-type small skeletal fossils. It appears that neither the Shuram event nor the emergence of macro-organisms, eumetazoans, and biologically controlled mineralization significantly affected the acanthomorphs, suggesting a marked stability of Ediacaran ecosystems up to the very beginning of the Cambrian.


2016 ◽  
Vol 27 (2) ◽  
pp. 242-254 ◽  
Author(s):  
Yang Peng ◽  
Yongbo Peng ◽  
Xianguo Lang ◽  
Haoran Ma ◽  
Kangjun Huang ◽  
...  

2017 ◽  
Vol 154 (6) ◽  
pp. 1217-1231 ◽  
Author(s):  
SOO YEUN AHN ◽  
MAOYAN ZHU

AbstractTheAsteridium–Heliosphaeridium–Comasphaeridium(AHC) acritarch assemblage is composed of common organic-walled microfossils in the basal Cambrian chert–phosphorite units in South China, indicating that the AHC assemblage can be a useful biostratigraphic tool for the Ediacaran–Cambrian boundary successions in the Yangtze Platform. To test the validity of the AHC acritarch assemblage as a biostratigraphic tool, the stratigraphic range of the AHC acritarch assemblage was confirmed, and its spatial and temporal relationships to other bio- and chemostratigraphic tools were analysed in the Yanjiahe Formation, Yangtze Gorges area, South China. The result shows that the AHC assemblage temporally correlates to theAnabarites trisulcatus–Protohertzina anabaricaAssemblage Zone, and spatially correlates to the large negative carbon isotope anomaly of the lowermost Cambrian (BACE) in the Yanjiahe Formation. This implies that the radiation of phytoplankton occurred slightly before the radiation of the small shelly fossils, and the AHC acritarch assemblage can be another important chronological reference to the lowermost Cambrian successions in South China, and potentially to global correlations.


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