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Conodont Biostratigraphy and Age of the Early Triassic fish-bearing-nodule Levels from Nanjing and Jurong, Jiangsu Province, South China

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Journal of Earth Science 2020年第1期31卷 9-22页

作者： Shuang Liu Zuoyu Sun Cheng Ji Min Zhou Dayong Jiang Laboratory of Orogenic Belt and Crustal Evolution Ministry of EducationDepartment of Geology and Geological MuseumPeking UniversityBeijing 100871China College of Earth Science and Engineering Shandong University of Science and TechnologyQingdao 266590China CAS Key L aboratory of Economic Stratigraphy and Paleogeography Nanjing Institute of Geology and PaleontologyCenter for Excellence in Life and PaleoenvironmentChinese Academy of SciencesNanjing 21000SChina

fish-bearing-nodules are found in Early Triassic marine strata in many regions, including East Greenland, East Spitsbergen, Northwest Madagascar, Canada, Angola, and South China. A new Olenekian(Early Triassic) conodont biostratigraphic study for stratum that contains fish-bearing-nodule levels is conducted based on the Longtan(LT) Section of Nanjing City and the Qingshan(QS) Section of Jurong County, Jiangsu Province, South China. A total of 101 samples were collected at the two sections and three conodont zones were recognized: in ascending order, they are Scythogondolella(Sc.) milleri Zone, Novispathodus(Nv.) pingdingshanensis Zone, and Triassospathodus(Tr.) aff. homeri Zone. The Scythogondolella milleri Zone is globally recognized as the uppermost conodont zone of the Smithian and the base of the Novispathodus pingdingshanensis Zone was previously suggested as the marker of the Smithian-Spathian boundary in the Yangtze region. The fish-bearing-nodule levels of Nanjing and Jurong are within the conodont Scythogondolella milleri Zone, laterally correlated well with the upper part of the Novispathodus waageni Zone in Chaohu of Anhui Province that also contains fish-bearing-nodule levels. The conodont biostratigraphic correlation confirms the Early Triassic fish-bearing-nodule levels in the Lower Yangtze region are coeval, with an end-Smithian in age.

关键词： Early Triassic conodont fish-bearing-nodule Lower Yangtze region South China

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