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Early Cambrian eodiscoid trilobites of the Yangtze Platform and their stratigraphic implications

Progress in Natural Science:Materials International 2003年第11期 61-66页

作者： YANG Aihua, ZHU Maoyan*, ZHANG Junming and LI Guoxiang(Nanjing Institute of Geology and Palaeontology, Chinese Academy of Sciences, Nanjing 210008, China) Nanjing Institute of Geology and Palaeontology Chinese Academy of Sciences Nanjing 210008 China

Analysis of the taxonomy and stratigraphic distribution of the Early Cambrian eodiscoid trilobites of the Yangtze Platform indicates that species of Tsunyidiscus and Hupeidiscus can be used for biostratigraphic correlation. T. aclis occurs only in the lower Qiongzhusian, T. armatus occurs in the lower and middle Qiongzhusian, while T. niutitangensis and T. tingi occur mainly in the middle and upper Qiongzhusian, with only T. tingi extending upward into the lower Canglangpuian. H. orientalis first appears in the upper Qiongzhusian, reaching peak abundance in the lower Canglangpuian and becoming extinct above the Drepanuroides Zone. Biostratigraphic and lithostratigraphic correlations indicate that the limestone in the lower part of the Mingxinsi Formation, the Upper Member of Jiumenchong Formation, and the upper part of the Middle Member of the Huangbailing Formation, can be correlated with each other as Hupediscus, an index fossil of the lower Canglangpuian, is abundant in all these units. The lower part of the Niutitang and Jiumenchong formations in eastern Guizhou, which mainly represent Qiongzhusian strata, can be correlated with the Lower Member of the Huangbailing Formation. The basal part of the Niutitang Formation, which may be equivalent to the Upper Meishucunian Shiyantou Formation in eastern Yunnan, is very condensed. Well-preserved sponge faunas and non-mineralized fossils in the lower part of the Niutitang and Hetang formations are not older than Qiongzhusian in age.

关键词： eodiscoids trilobites black shale stratigraphy Early Cambrian Yangtze Platform South China.

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Cambrian trilobite Ovatoryctocara granulata Tchernysheva,1962 and its biostratigraphic significance

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Progress in Natural Science:Materials International 2009年第2期19卷 213-221页

作者： Jinliang Yuan a,Yuanlong Zhao b,Jin Peng b,Xuejian Zhu a,Jih-pai Lin c a Nanjing Institute of Geology and Palaeontology,Chinese Academy of Sciences,East Beijing Road 39,Nanjing 210008,China b College of Resource and Environment Science,Guizhou University,Guiyang 550003,China c School of Earth Sciences,Ohio State University,Columbus,OH 43210,USA Nanjing Institute of Geology and Palaeontology Chinese Academy of Sciences East Beijing Road 39 Nanjing 210008 China College of Resource and Environment Science Guizhou University Guiyang 550003 China School of Earth Sciences Ohio State University Columbus OH 43210 USA

The genus Ovatoryctocara Tchernysheva,1962,and its key species Ovatoryctocara granulata Tchernysheva,1962,are revised. Ovatoryctocara granulata occurs near the base of the Ovatoryctocara Zone and ranges up into the lower portion of the Kounamkites Zone in the Siberian Platform. O. granulata also appears in southeastern Guizhou,South China,but O. granulata in northern Greenland may represent an indefinite species. Specimens of Ovatoryctocara from Newfoundland cannot be identified to species level. Specimens includ-ing two cranidia and three pygidia from the lower part of the Aoxi Formation at Yaxi Village,Shizhu Town,eastern Tongren,north-eastern Guizhou,were previously assigned to O. granulata,which is now reassigned as a new species O. yaxiensis sp. nov. It bears the following main features: glabella club-shaped,slightly expanded medially,with four pairs of lateral furrows,of which S1-S3 are trian-gular pits,S4 is shallow,connecting with axial furrow; shorter palpebral lobe situated a little anterior to the midway of facial suture across the fixigenae,longer posterolateral area (exsag.); semielliptical pygidium consisting of seven axial rings with a terminal piece and with eight pairs of marginal tips giving a sawtooth-like shape of the lateral margins in dorsal view. Although O. granulata is a widely distributed species,the FAD of O. granulata,for a global stage boundary,still has some disadvantages. First,its distribution is not as wide as that of Oryctocephalus indicus (Reed,1910). Second,specimens of O. granulata are common only in Siberia. Third,the strati-graphic range of the species has not been studied in detail in all continents. Fourth,O. granulata is relatively small and easily affected by post-burial distortion. Last but not least,there exists obviously a facies change between the Ovatoryctocara Zone (lower Amgan Stage; deeper water facies) and the underlying Anabaraspis splendens Zone (Toyonian Stage; shallow water facies) in Siberian Platform. Nev-ert

关键词： trilobites Ovatoryctocara granulata Tchernysheva,1962 Cambrian Biostratigraphy

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Trilobite Biostratigraphy of the lower Paleozoic(Cambrian–Ordovician)Joseon Supergroup,Taebaeksan Basin,Korea

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Acta Geologica Sinica(English Edition) 2016年第6期90卷 1976-1999页

作者： CHOI Duck K LEE Jeong Gu LEE Seung-Bae PARK,Tae-Yoon S. HONG Paul S. Research Institute of Basic Sciences Seoul National UniversitySeoul 151-747Korea Ministry of Science ICTand Future PlanningGwacheon 427-700Korea Korea Institute of Geoscience and Mineral Resources Daejeon 305-350Korea Korea Polar Research Institute Incheon 406-840Korea

In Korea, trilobites are among the most intensively studied fossil groups in the past century and provide invaluable information about lower Paleozoic stratigraphy, paleogeography, and tectonics of the Korean Peninsula. trilobites occur in the lower Paleozoic Joseon Supergroup of the Taebaeksan Basin which was part of the Sino-Korean Craton in the Paleozoic. The Joseon Supergroup is divided into the Taebaek, Yeongwol, and Mungyeong groups. The Taebaek and Yeongwol groups are richly fossiliferous, while the Mungyeong Group is poorly fossiliferous. Contrasting trilobite faunal contents of the Taebaek and Yeongwol groups resulted in two separate biostratigraphic schemes for the Cambrian–Ordovician of the Taebaeksan Basin. A total of 22 biozones or fossiliferous horizons were recognized in the Taebaek Group; 19 zones were established in the Yeongwol Group; and four biozones were known from the Mungyeong Group. These trilobite biozones of the Taebaeksan Basin indicate the Joseon Supergroup ranges in age from the Cambrian Series 2 to Middle Ordovician and can be correlated well with the formations of North China, South China, and Australia.

关键词： trilobites biostratigraphy Cambrian–Ordovician Taebaeksan Basin

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Cambrian Stratigraphy and Faunal Elements Along the Kurgiakh-Surichun La Section(Kurgiakh Valley),Zanskar-Spiti Basin of Northwest Himalaya

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地学前缘 2009年第S1期16卷 265-266页

作者： Birendra P.Singh H.No.37 Hari Vihar(Vijay Park)

The Cambrian rocks are well exposed along the Kurgiakh-Surichun La section,situated 78 km SE of the Padam Village along a track route at 33°03′787″N and 77°013′647″E in between the Kurgiakh and Surichun La,in Kurgiakh Valley(southeastern Zanskar).Around 715 m thick Cambrian succession was measured along the right and left banks of

关键词： Cambrian ichnofossils trilobites Kurgiakh-Surichun La Lejopyge laeivigata Cruziana-Skolithos ichnofacies

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