Atrypid Brachiopods from the Upper Devonian Wangchengpo Formation(Frasnian)of southern Guizhou,China—Extinction Patterns in the Frasnian of South China

作     者：MA Xueping Paul COPPER SUN Yuanlin LIAO Weihua 

作者机构：The Key Laboratory of Orogenic Belts and Crustal Evolution Department of Geology Peking University Beijing 100871 China Department of Earth Sciences. Laurentian University Sudbury Canada P3E 2C6 Nanjing Institute of Geology and Palaeontology Chinese Academy of Sciences Nanjing Jiangsu 210008 China 

出 版 物：《Acta Geologica Sinica(English Edition)》 (地质学报（英文版）)

年 卷 期：2005年第79卷第4期

页      面：437-452页

核心收录：

学科分类：070903[理学-古生物学与地层学(含：古人类学)] 0709[理学-地质学] 07[理学] 

基　　金：Th is work is supported by the Major Basic Research Project(G2000077700) the National Natural Science Foundation of China(Grant No.401 72006,40232019,and 40472009) 

主　　题：Atrypids Brachiopoda Upper Devonian Wangchengpo Formation South China 

摘      要：The Wangchengpo Frasnian section of Dushan County contains two atrypid brachiopod assemblages. The lower is characterized by the Atryparia （Costatrypa） dushanensis fauna that appears at the base of the Hejiazhai Member approximately in the falsiovalis to transitans conodont zones： the upper is characterized by the Radiatrypa yangi fauna, which appears in the Lujiazhai Member approximately correspondent with the hassi to Upper rhenana conodont zones. Atrypid brachiopods, together with other brachiopods from the Dushan section show that the Hejiazhai Member is of Frasnian age. Preliminary analyses of Frasnian atrypid brachiopods from sections of South China indicate that there are nine genera and subgenera including Atryparia （Costatrypa）, Kyrtatrypa, Spinatrypa, lsospinatrypa, Spinatrypina, lowatrypa, Desquamatia （Desquamatia）. Desquamatia （Seratrypa）, and Radiatr）pa. Atrypid species diversity did not change much through the Frasnian. On a regional scale in South China, most atrypid species went extinct prior to the Frasnian/Famennian boundary. At any specific locality or section, these atrypids became extinct about 20-40 m below the Frasnian/Famennian （F/F） boundary, within the linguiformis conodont Zone, marking this as the major extinction level. Three new atrypid species are described： Atryparia （Costatrypa） dushanensis, lowatrypa pseudobodini, and Radiatrypa yangi.