Atrypid Brachiopods from the Upper D

Atrypid Brachiopods from the Upper Devonian Wangchengpo Formation (Frasnian) of Southern Guizhou, China--Extinction Patt

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 thefalsiovalis 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,Isospinatrypa,Spinatrypina,Iowatrypa,Desquamatia (Desquamatia),Desquamatia (Seratrypa),and Radiatrypa.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,Iowatrypa pseudobodini,and Radiatrypa yangi.

作 者： Ma Xueping Paul COPPER SUN Yuanlin Liao Weihua   作者单位： Ma Xueping,SUN Yuanlin(The Key Laboratory of Orogenic Belts and Crustal Evolution,Department of Geology,Peking University,Beijing 100871,China)

Paul COPPER(Department of Earth Sciences,Laurentian University,Sudbury,Canada P3E 2C6)

Liao Weihua(Nanjing Institute of Geology and Palaeontology,Chinese Academy of Sciences,Nanjing,Jiangsu 210008,China) 

刊 名： 地质学报（英文版）  SCI 英文刊名： ACTA GEOLOGICA SINICA  年，卷(期)： 2005 79(4)  分类号： P5  关键词： Atrypids   Brachiopoda   Upper Devonian   Wangchengpo Formation   South China  

【Atrypid Brachiopods from the Upper D】相关文章：

Chondritic osmium isotopic composition of late Archean convecting upper mantle:Evidence from Zunhua podiform chromitites04-27

In Silico Cloning and Sequence Analysis of Phospholipase Dα Gene from Peach Fruit04-28

Reflection attributes of paragneiss in the upper crust04-27

STRUCTURE, MOLECULAR WEIGHT AND BIOACTIVITIES OF (1→3)-β-D- GLUCANS AND ITS SULFATED DERIVATIVES FROM FOUR KINDS OF LENT04-28

learn from steven spielberg05-24

New Sesquiterpenes from Cacalia ainsliaeflora04-27

Chapter 26: Writing from Reading05-04

Numerical study on the summer circulation of the upper South China Sea and its establishment04-28

学科术语 D05-04

Two New Eudesmanoildes from Sonchus transcaspicus04-28