• 责任者：Wang Zhihao (Nanjing Institute of Geology and Palaeontology ; Chinese Academy of Sciences ; Nanjing 210008 ; China) ; Wu Rongchang
• 刊名：Acta Palaeontologica Sinica
• 出版年：2013
• 卷期：52(4)
• 关键词：牙形石 ; conodonts ; 塔克拉玛干沙漠 ; Taklimakan Desert
• 页码：p.408-423
• 图表：4 illus., 3 plates, 30 refs.
• 分类号：1100
• issnNo：ISSN0001-6616
• isbnNo：CN32-1188/Q

     Conodont faunas Ordovician boundary from the Middle and Upper interval are recorded from Ln 50 well in the Lunnan exploration area, north- western Taklimakan Desert, Xinjiang, China. The fauna includes Pygodus anserinus, P. serra, P. xinjiangensis, Ansella jemtlandica, Cornuodus longibasis , Periodon aculeatus , Protopanderodus calceatus, P. cooperi, P. varicostatus, Scabbar- della altipes , Spinodus spinatus , and Cahabag- nathus sweeti, etc. Three conodont zones can be recognized. In descending order they are the Pygodus anserinus , P. serra and P. xinjiangen- sis zones. The Middle and Upper Ordovician boundary is just above the base of Pygodus anseri- nus Zone. In this paper, particular attention is paid to Pygodus xinjiangensis, the evolution of Pygo- dus, and the differences between these three species. Because species of P.ygodus are of extraordi- nary importance for global correlation, the results of present study, which have clarified some taxo- nomic problems within this genus, are of interna- tional significance.