{"title":"The Middle-Upper Jurassic Boundary in the North of Siberia: Problems of the Evidence","authors":"V. G. Knyazev, A. S. Alifirov","doi":"10.1134/s0869593824010039","DOIUrl":null,"url":null,"abstract":"<h3 data-test=\"abstract-sub-heading\">Abstract</h3><p>The grounds for identifying the Eboraciceras subordinarium Zone in the Upper Callovian of Siberia are critically discussed. The key sections of this zone and the ammonite assemblage that characterizes it are examined in detail. It is concluded that it is impossible to recognize the Eboraciceras subordinarium Zone and its further use in stratigraphic schemes is not suggested. North Siberian taxa, previously identified as Late Callovian <i>Eboraciceras</i>, are mostly assigned to <i>Rondiceras</i> and indicate a Middle Callovian age of the host rocks. Beds with Cadoquenstedtoceras begichevi have been proposed as an approximate equivalent of the European Q. lamberti Zone in the Upper Callovian of Siberia.</p>","PeriodicalId":51168,"journal":{"name":"Stratigraphy and Geological Correlation","volume":"47 1","pages":""},"PeriodicalIF":1.0000,"publicationDate":"2024-03-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"0","resultStr":null,"platform":"Semanticscholar","paperid":null,"PeriodicalName":"Stratigraphy and Geological Correlation","FirstCategoryId":"89","ListUrlMain":"https://doi.org/10.1134/s0869593824010039","RegionNum":4,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"Q3","JCRName":"GEOLOGY","Score":null,"Total":0}
引用次数: 0
Abstract
The grounds for identifying the Eboraciceras subordinarium Zone in the Upper Callovian of Siberia are critically discussed. The key sections of this zone and the ammonite assemblage that characterizes it are examined in detail. It is concluded that it is impossible to recognize the Eboraciceras subordinarium Zone and its further use in stratigraphic schemes is not suggested. North Siberian taxa, previously identified as Late Callovian Eboraciceras, are mostly assigned to Rondiceras and indicate a Middle Callovian age of the host rocks. Beds with Cadoquenstedtoceras begichevi have been proposed as an approximate equivalent of the European Q. lamberti Zone in the Upper Callovian of Siberia.
期刊介绍：
Stratigraphy and Geological Correlation is the only journal that provides comprehensive coverage of the fundamental and applied aspects of stratigraphy and the correlation of geologic events and processes in time and space. Articles are based on the results of multidisciplinary studies and are for researchers, university professors, students, and geologists interested in stratigraphy and the chronological features of the world’s geological record.
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