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Size variation of the end Permian conodont Neogondolella at Meishan Section,Changxing,Zhejiang and its significance
基金项目:中国地质大学科研和教改项目
摘    要:Recent works reveal that the size reduction of or- ganisms during the Permian-Triassic transition is of great importance for research on biotic mass extinction and recovery in this period1,2]. Initially, Urbanek (1993) observed a decrease in the size of Silurian graptolites during the biotic crisis, and used the term “Lilliput Effect” to define the size reduction in sur- viving animal taxa3]. Subsequently, researchers re- ported a decrease in size of late Devonian conodonts4], heart urc…


Size variation of the end Permian conodont Neogondolella at Meishan Section, Changxing, Zhejiang and its significance
Authors:LUO Genming  LAI Xulong  JIANG Haishui  ZHANG Kexin
Abstract:This study is based on both a generic and species level investigation of the individual size of the latest Permian conodont Neogondolella Pa elements collected from Meishan Section A, Changxing, Zhejiang Province. In this study, an obvious size reduction of Neogondolella Pa elements within bed 24e of the upper Changxing Limestone is recognized. The size variation of the Neogondolella occurs simultaneously with some important events including the negative shift of δ13C, change in the ratio of the abundance of cyanobacterial biomarkers versus that of other general bacterial biomarkers and the shallowing of the sea water. Through the investigation of the paleoenvironmental changes and the analysis of the paleoecology of the conodont genus Neogondolella, the authors propose that the major factors for the size reduction of species of the conodont genus Neogondolella are food shortages caused by the mass extinction, the shallowing of the sea water as well as the increase in opacity of the sea water during the end Permian. The same phenomenon of Neogondolella size reduction is also observed in preliminary research from the same horizon at Shangsi Section, Sichuan Province. All the evidence suggests that there was a mass extinction that occurred at the horizon of bed 24e, and the evidence supports the viewpoint of a multi-phase mass extinction during the Permian and Triassic transition in South China.
Keywords:Meishan Section  end Permian  conodont  Neogondolella  size reduction  
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