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| 1 | Conodont and Ammonoid Biostratigraphies around the Permian-Triassic Boundary from the Jianzishan of South China显示文摘Conodonts and ammonoids have played significant roles in the Permian-Triassic timescale.In order to uncover the nature of the Permian-Triassic mass extinction and subsequent recovery,we studied conodont and ammonoid biostratigraphies around the Permian-Triassic boundary from Jianzishan of Hubei,South China.A total of four conodont zones and two ammonoid beds are recognized.In ascending order,the conodont zones are Late Changhsingian Clarkina changxingensis Zone,Clarkina yini Zone and Griesbachian Hindeodus parvus Zone,Hindeodus postparvus Zone;the ammonoid beds are Late Griesbachian Ophiceras beds and Early Dienerian Ussuridiscus varaha beds.At Jianzishan,Ophiceras beds are stratigraphically younger than Hindeodus parvus Zone,but it is likely to be the same level with Hindeodus postparvus Zone.The Lower Dienerian in Bed 8 in this section is characterized by ammonoid Ussuridiscus varaha beds,which is associated with many Late Griesbachian conodonts including Hindeodus postparvus,Hindeodus praeparvus,Hindeodus typicalis,Hindeodus pisai,Hindeodus latidentatus,Hindeodus parvus,Hindeodus anterodentatus and Isarcicella turgida,indicating these conodont species could pass through the Griesbachian-Dienerian boundary and occurred in the Early Dienerian oceans. | Ruoyu Bai Xu Dai Haijun Song | 2017 | Journal of Earth Science2017，28，4： | 4 |
| 2 | 全球古-中生代之交牙形石研究进展显示文摘古-中生代之交发生了许多重要的地质事件,包括“Pangea”大陆的解体、大火成岩省的喷发、晚古生代大冰期的消逝、极端高温事件、两次生物大灭绝以及迟缓的生物复苏等.牙形石作为该时期主要的标准化石,是进行地层对比以及生物与环境协同演化研究的重要依据.近些年,此阶段的牙形石相关研究取得了许多重要的进展,这些新的材料和技术手段上的突破,为人们进行高精度的地层对比、定量重建该时期地球的生物及环境演变起到了关键作用.本文系统地对该时期全球牙形石的研究,包括牙形石的生物学、地层学以及地球化学研究等进行了总结,也提出了部分亟待解决的问题.未来,随着更多技术手段的开发以及更多基础材料的发现,将加强研究人员对该时期牙形石演化的理解,必然也会在研究这段地质历史转折与突变期的古海洋、古环境、古生物过程中发挥更大的作用. | 吴奎 童金南 李红军 田力 邹亚锐 梁蕾 赵璧 | 2022 | 地球科学2022，47，3： | 4 |
| 3 | Early Anisian(Middle Triassic)Conodonts from Romania and China,with Comments on Their Role in the Recognition and Correlation of the Base of the Anisian显示文摘The Olenekian-Anisian Boundary(OAB)interval is an important time in Earth history,reflecting the last phase of marine ecosystem recovery in the aftermath of the end-Permian mass extinction.Despite this,the Global Stratotype Section and Point(GSSP)for the base of the Anisian remains undefined.The first appearance of the conodont Chiosella timorensis has been proposed as a potential index for the boundary;however,the discovery of this conodont with ammonoids traditionally considered to be Spathian has generated doubts about its suitability.The taxonomy and relationships of early Anisian conodonts,including species of Chiosella,remain understudied,which leads to difficulties in correlation.New species of Neogondolella(N.gradinarui)and Magnigondolella(M.n.sp.D)have been recognized from the leading GSSP candidate section for the OAB at De?li Caira,and from an additional OAB section at Guandao.Furthermore,several species previously identified in Canada and the USA can be recognized from these sections,improving correlation between Tethys and North America.One of these species may serve as a suitable alternative proxy for the OAB;for instance,N.curva appears just below the first Anisian ammonoids in De?li Caira,and just above the first appearance of C.timorensis in both De?li Caira and Guandao.Continued work on sections other than the candidate sections,and on the taxonomy of species outside of those traditionally proposed as indices,is required. | Martyn Lee Golding | 2021 | Journal of Earth Science2021，32，3： | 1 |
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