Orytcocephalus indicus is widely distributed in South Chi na, the Himalaya, Korea, North America, Greenland, Siberia and occurs abundantly in the Wuliu-Zengjiayan section at Balang, Jianhe, Guizhou, China.This section contains the most complete record known of the true stratigraphic range of the taxon.In addition to detailed documentation of trilobite biostratigraphy, research on acritarchs, sequence stratigraphiy , biomarkers, and carbon isotopes has been completed, whereas sulfur isotopes has also been carried out.The Wuliu-Zengjiay an section meets all the requirements for a GSSP, and the FAD of O.indicus appears to represent the key level for defining a global stage.With the exception of the Mediterranean region, correlation between South China and other paleocontinents bear ing Canbrian strata is more reliable.The Wuliu-Zengjiayan section is easily accessed in all seasons.In contrast to O.indicus, Ovatoryctocara granulata is dis tributed only in Siberia, Greenland and Newfoundland.The Molodo River section less suitable for a GSSP because the stra ta are highly condensed and the section is difficult to access.Obviously, the the Wuliu-Zengjiayan section with the FAD of Oryctocephalus indicus is more advantages than the Moloddo river section with the FAD of Ovatoractocara granurata as the GSSP defining the conterminous base of Cambrian provisional Series 3 and Stage 5.The Wuliu-Zengjiayan section proves the best choice for the GSSP defining the conterminous base of Cambrian provisional Series 3 and Stage 5.
Orytocephalus indicus Ovatoryctocara granulata GSSP Cambrian Correlation China
Yuanlong ZHAO Jin-Pai LIN Robert R GAINES Haijing SUN Yuning YANG Jin PENG Jianliang YUAN Loren E.BABCOCK QingJun GUO Leiming YIN Xingliang YANG Tongshu Tai Chunjiang WANG
College of Resource and Environment Engineering of Guizhou University Guiyang 550003 China Nanjing Institute of Geology and Palaeontology, the Chinese Academy of Sciences Nanjing 210008 China Geology Department, Pomona College, 185 E.Sixth Street, Claremont, CA 91711 USA School of Earth Sciences, The Ohio State University, Columbus, Ohio 43210, USA and 1 Department of G Center for Environmental Remediation, Institute of Geographic Sciences and Natural Resources Researc Bureau of Land and Resources of Southeast Guizhou Miao and Dong Autonomous Prefecture, Kaili 556000, State Key Laboratory of Petroleum Resources and Prospecting, China University of Petroleum, Beijing