Conodonts from Moscovian–Kasimovian Boundary Interval in the Type and Reference Sections, Moscow Basin, Russia

IF 0.7 4区地球科学 Q4 PALEONTOLOGY Paleontological Journal Pub Date : 2023-11-30 DOI:10.1134/s0031030123070043

N. V. Goreva

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Abstract

The GSSP for the Kasimovian Stage has not been fixed or defined. Several conodont species: Swadelina subexcelsa (Alekseev et Goreva, 2001), Idiognathodus turbatus (Rosscoe et Barrick, 2009) or Idiognathodus sagittalis (Kozitskaya, 1978) and Idiognathodus heckeli (Rosscoe et Barrick, 2013) were proposed and discussed by the Task Group as potential index taxa for the boundary definition. This paper describes the distribution of all potential conodont markers and refines the levels of their appearance in the key sections in the type region of the Kasimovian, considering revision of the previously obtained and new data. The traditional lower boundary of the Kasimovian Stage in the Moscow Basin coincides with the level of FAD of the conodont Swadelina subexcelsa. This species could be traced across large distances, including different continents and could be proposed as a good marker for the Moscovian-Kasimovian boundary. The first occurrences of other species as Idiognathodus sagittalis, I. turbatus and I. heckeli are fixed at the base of the middle member of the Neverovo Formation of the Khamovnikian Substage, i.e. much higher than the base of the Kasimovian that was established for the Carboniferous of Russia. The levels of the appearance of this species have a high potential for the global correlation, but it is not good solution for the definition of the Global Kasimovian Boundary.

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俄罗斯莫斯科盆地莫斯科-卡西莫维安边界段的牙形刺类型和参考剖面

【摘要】卡西莫范阶段的GSSP还没有固定或定义。工作组提出并讨论了几个牙形刺物种:Swadelina subbexcelsa (Alekseev et Goreva, 2001)、Idiognathodus turbatus (Rosscoe et Barrick, 2009)、Idiognathodus sagittalis (Kozitskaya, 1978)和Idiognathodus heckeli (Rosscoe et Barrick, 2013)作为边界定义的潜在索引分类群。本文描述了所有潜在牙形石标记物的分布，并结合对已有资料和新资料的修正，对卡西莫瓦岩类型区关键剖面的牙形石标记物的出现水平进行了改进。莫斯科盆地kasasimovian期的传统下边界与牙形刺Swadelina亚尖牙的FAD水平相吻合。这个物种可以跨越很远的距离，包括不同的大陆，并且可以作为莫斯科-卡西莫维安边界的一个很好的标记。其他物种如Idiognathodus sagittalis、I. turbatus和I. heckeli的首次出现地点固定在khamovnikiian亚阶段Neverovo组中段的底部，即远高于为俄罗斯石炭纪建立的Kasimovian的底部。该物种的出现水平具有很高的全球相关潜力，但它不是全球卡西莫瓦边界定义的好解。

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来源期刊

Paleontological Journal 地学-古生物学

CiteScore

1.20

自引率

33.30%

发文量

审稿时长

6-12 weeks

期刊介绍： Paleontological Journal (Paleontologicheskii zhurnal) is the principal Russian periodical in paleontology. The journal publishes original work on the anatomy, morphology, and taxonomy of fossil organisms, as well as their distribution, ecology, and origin. It also publishes studies on the evolution of organisms, ecosystems, and the biosphere and provides invaluable information on global biostratigraphy with an emphasis on Eastern Europe and Asia.