【摘 要】
：
The Wangchengpo Frasnian section of Dushan County contains two atrypid brachiopod assemblages.The lower is characterized by the Atryparia (Costatrypa) dushanens
【机 构】
：
The Key Laboratory of Orogenic Belts and Crustal Evolution,Department of Earth Sciences,Nanjing Inst
论文部分内容阅读
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.
其他文献
The extractive reaction process of oxygen-working solution-water three-phase system for the production of hydrogen peroxide by the anthraquinone method was inve
On the basis of the piezoelectric theory, Mindlin plate theory, viscoelastic theory and ideal fluid equa tion, the finite element modeling of a fluid-filled cyl
An actively water-cooled limiter has been designed for the long pulse operation of an HT-7 device, by adopting an integrated structure-doped graphite and a copp
采用无规相近似(RPA)耦合集团展开方法求解薛定谔本征值方程,计算高阶胶球波函数. 在计算中,用空心Wilson圈图作为试探波函数,对特殊Wilson圈图作近似处理,计算出的2+1维SU(2
This paper reports an experiment on the failure of a precracked plate made of unidirectional glass-epoxy fiber-reinforced composites subjected to three-point be
A novel nanocomposite consisting of poly (3, 4-ethylenedioxythiophene)/poly (styrenesulfonate) (PEDOT/PSS) and CuI was synthesized via the reduction of CuCl2 by
The studies of novel inhibitors of DNA topoisomerase I (Topo I) have already become very promising in cancer chemotherapy. Identifying the new drug-binding resi
Let G = ( V, E) be a finite simple graph and Pn denote the path of order n. A spanning subgraph F is called a {P2, P3}-factor of G if each component of F is iso
The picosecond accelerator (PA) is a low energy electron linear accelerator facility under commissioning,which is built for the experiment of ps level pulse rad