The Middle-Upper Jurassic Boundary in the North of Siberia: Problems of the Evidence
IF 1
4区 地球科学
Q3 GEOLOGY
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.
西伯利亚北部的中-上侏罗世界线：证据问题
摘要 对确定西伯利亚上卡勒维世 Eboraciceras 下生带的依据进行了批判性讨论。详细研究了该区的主要地段以及作为其特征的鹦鹉螺集合体。结论是不可能承认 Eboraciceras subordinarium 区，也不建议在地层方案中进一步使用该区。北西伯利亚类群以前被认定为晚卡勒夫世的 Eboraciceras，现在大多被归入 Rondiceras，表明寄主岩的年龄为中卡勒夫世。有人建议将带有 Cadoquenstedtoceras begichevi 的床层作为西伯利亚上卡勒维期欧洲 Q. lamberti 区的近似等同物。
本文章由计算机程序翻译，如有差异，请以英文原文为准。
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来源期刊
CiteScore
1.80
自引率
30.00%
发文量
22
审稿时长
>12 weeks
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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