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Revised conodont zonation and conodont evolution across the Permian–Triassic boundary at the Shangsi section, Guangyuan, Sichuan, South China



Revised conodont zonation and conodont evolution across the Permian–Triassic boundary at the Shangsi section, Guangyuan, Sichuan, South China



Global and Planetary Change 77(3-4): 0-115



Large conodont samples (2kg at most) have been collected from the uppermost Permian and the lowermost Triassic (beds 26 33) at Shangsi, northern Sichuan. These have enabled us to establish parallel hindeodid and gondolellid conodont zones through the section similar to previously recognized in the Meishan section. In ascending order, three newly established gondolellid zones at the Shangsi section are: Neogondolella yini Zone (bed 26), Neogondolella meishanensis Zone (beds 27a 27c), Neogondolella taylorae Zone (beds 28a 29d). Also in ascending order, four revised or newly established hindeodid zones are: Hindeodus changxingensis Zone (beds 28a 29b) Hindeodus parvus Zone (beds 29c 3a), Isarcicella lobata Zone (beds. Research highlight: The new investigations indicate that the first occurrence of H. parvus in the Shangsi section is about 2m lower than the previously reported horizon, and the first occurrence of I.isarcica is 1m lower than previously reported horizon.The PTB at the Shangsi appears to occur 22cm above the base of bed 28a.Parallel hindeodid and gondolellid conodont zones identified through the PTB at the Shangsi section correspond with those established at Meishan.The absence of the H. changxingensis Zone at some localities probably indicates the presence of a disconformity around the extinction level.

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Accession: 036068727

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DOI: 10.1016/j.gloplacha.2011.04.003


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