Biozonation of Floian (Lower Ordovician) Graptolites from <?xml:namespace prefix = st1 ns = "urn:schemas-microsoft-com:office:smarttags" /><st1:place w:st="on"><st1:City w:st="on">Yiyang</st1:City>, <st1:State w:st="on">Hunan</st1:State></st1:place> Province<?xml:namespace prefix = o ns = "urn:schemas-microsoft-com:office:office" /><o:p></o:p>

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Biozonation of Floian (Lower Ordovician) Graptolites from Yiyang, Hunan Province

详细信息

责任者：Li Lixia (Department of Earth Science ; Nanjing University ; Nanjing 210093 ; China) ; Feng Hongzhen
刊名：Journal of Stratigraphy
出版年：2009
卷期：33(2)
关键词：早奥陶世 ; Lower Ordovician ; 笔石纲 ; Graptolithina ; 湖南 ; Hunan Province
页码：p.123-137
图表：3 illus., 1 table, 62 refs.
分类号：1200
issnNo：ISSN0253-4959
isbnNo：CN32-1187/P

摘要

Based on materials from the Nanba section in the Yiyang area, Hunan Province, four graptolite zones of the Floian Stage (Lower Ordovician) are identified in ascending order: Tetragraptus approximatus Zone, Pendeograptus fruticosus Zone, Didymograptellus bifidus Zone and Corymbograptus deflexus Zone. No hiatus exists below the Floian Stage in the Nanba section since the T. approximatus Zone is underlain directly by the Hunnegraptus copiosus Zone, the topmost graptolite zone of the preceding Tremadocian Stage. As a result, a consecutive graptolite succession of the Floian Stage could be established in the Yiyang area. This succession allows precise correlation of Floian graptolite biostratigraphy between this area and elsewhere home and abroad.