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THE DIFFERENTIATION OF GRAPTOLITE BIOFACIES ACROSS THELOWER/ MIDDLE ORDOVICIAN BOUNDARY IN SOUTH CHINA AND THE SELECTION OF BIO-MARKER FOR GLOBAL LOWER/MIDDLEORDOVICIAN BOUNDARY

Chuanshang Wang, Xiaofeng Wang

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Abstract

Based on analyzing the characteristics of the graptolite faunas from the Dawan Formation at Huanghuachang section, Yichang(central Yangtze Platform) and the Meitan Formation at Chengkou section, Chongqing(northern Yangtze Platform), respectively, combining with the results from Chongyi area, Jiangxi(basin facies) and Jiangnan transitional belt,the authors discussed the correlation between graptolite and conodont fauna as well as the differentiation of graptolite biofacies at the Lower/Middle Ordovician boundary interval in South China. Consequently, the authors consider that the Huanghuachang section fulfills the requirements for a GSSP and the FAD of conodont Baltoniodus triangularis is a good proxy for the base of Middle Ordovician.

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What this paper is about

Based on analyzing the characteristics of the graptolite faunas from the Dawan Formation at Huanghuachang section, Yichang(central Yangtze Platform) and the Meitan Formation at Chengkou section, Chongqing(northern Yangtze Platform), respectively, combining with the results from Chongyi area, Jiangxi(basin facies) and Jiangnan transitional belt,the authors discussed the correlation between graptolite and conodont fauna as well as the differentiation of graptolite biofacies at the Lower/Middle Ordovician boundary interval in South China. Consequently, the authors consider that the Huanghuachang section fulfills the requirements for a GSSP and the FAD of conodont Baltoniodus triangularis is a good proxy for the base of Middle Ordovician.

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Available abstract

Based on analyzing the characteristics of the graptolite faunas from the Dawan Formation at Huanghuachang section, Yichang(central Yangtze Platform) and the Meitan Formation at Chengkou section, Chongqing(northern Yangtze Platform), respectively, combining with the results from Chongyi area, Jiangxi(basin facies) and Jiangnan transitional belt,the authors discussed the correlation between graptolite and conodont fauna as well as the differentiation of graptolite biofacies at the Lower/Middle Ordovician boundary interval in South China. Consequently, the authors consider that the Huanghuachang section fulfills the requirements for a GSSP and the FAD of conodont Baltoniodus triangularis is a good proxy for the base of Middle Ordovician.

Key concepts: Conodont, Ordovician, Paleontology, Geology, Global Boundary Stratotype Section and Point, Facies, Fauna, Section (typography)

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THE DIFFERENTIATION OF GRAPTOLITE BIOFACIES ACROSS THELOWER/ MIDDLE ORDOVICIAN BOUNDARY IN SOUTH CHINA AND THE SELECTION OF BIO-MARKER FOR GLOBAL LOWER/MIDDLEORDOVICIAN BOUNDARY — Research Paper | ScholarLens