Episodes 2019; 42(2): 165-184
Published online June 1, 2019
Copyright © International Union of Geological Sciences.
Yuanlong Zhao1, Jinliang Yuan2, Loren E. Babcock3, Qingjun Guo4, Jin Peng1, Leiming Yin2, Xinglian Yang1, Shanchi Peng2,5*, Chunjiang Wang6, Robert R. Gaines7, Jorge Esteve8, Tongsu Tai9, Ruidong Yang1, Yue Wang1, Haijing Sun2, and Yuning Yang1
1College of Resource and Environment Engineering, Guizhou University and Guizhou Research Center for Palaeontology, Guiyang, 550025, China
2Nanjing Institute of Geology and Palaeontology, Chinese Academy of Sciences, 39 East Beijing Road, Nanjing 210008, China
3School of Earth Sciences, The Ohio State University, 125 South Oval Mall, Columbus, OH 43210, USA
4Center for Environmental Remediation, Institute of Geographic Sciences and Natural Resources Research, Chinese Academy of Sciences, Beijing 100101, China
5State Key Laboratory of Paleobiology and Stratigraphy, Chinese Academy of Sciences, Nanjing 210008, China; *Corresponding author, E-mail: email@example.com
6College of Geosciences & State Key Laboratory of Petroleum Resources and Prospecting, China University of Petroleum, Beijing 102249, China
7Geology Department, Pomona College, 185E. Sixth Street, Claremont, CA 91711, USA
8Departamento de Paleontolgía, Facultad de CC Geológicas, Universidad Complutense de Madrid, José Antonio Novais 12, 28040, Madrid, Spain
9Agency of Kaili Area Protected Fossils, Jianhe, Guizhou 556300, China
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The International Commission on Stratigraphy and the IUGS Executive Committee have recently ratified a Global Standard Stratotype-section and Point (GSSP) defining the conterminous base of the third series and the fifth stage of the Cambrian System. The series and the stage are respectively named the Miaolingian Series and Wuliuan Stage, after the Maioling Mountains in southeastern Guizhou and the Wuliu sidehill, Jianhe County, in eastern Guizhou Province, South China, where the GSSP is located. The GSSP is exposed in a natural outcrop near the Balang Village at a position of 26° 44.843′N latitude and 108° 24.830′E longitude. It is defined at the base of a silty mudstone layer 52.8 m above the base of the Kaili Formation in the Wuliu-Zengjiayan section, coinciding with the first appearance of the cosmopolitan oryctocephalid trilobite Oryctocephalus indicus (base of the O. indicus Zone). Secondary global markers at or near the base of the series and stage include the peak of a rather large negative carbon isotopic excursion (ROECE excursion), the simultaneous appearance of many acanthomorphic acritarch forms, a transgressive phase of a major eustatic event, and the last appearance of intercontinental polymerid trilobites, either Bathynotus or Ovatoryctocara. Faunal turnovers close to the base of the Miaolingian Series and Wuliuan Stage have been recognized as being at the base of the Oryctocephalus indicus Zone of Amgan Stage in Siberia, the Delamaran Stage in Laurentia, the Oryctocephalus indicus Zone in the Indian Himalaya and North Greenland, near the base of the Delamaran Stage in Australia, and within the Eccaparadocides sdzuyi Zone in Iberia and the Ornamentaspis frequens Zone in Morocco.