Abstract

The study of Callovian ammonites Longaeviceras and closely related taxa from the east coast of Anabar Bay (section 109, northern Siberia) is presented. Genera and species previously unknown here, such as Rondiceras milaschevici, Pseudolongaeviceras densicostatum gen. et sp. nov., Platylongoceras holtedahli, and Pseudocadoceras laminatum, are identified. The presence of the Eboraciceras subordinarium Zone in the studied section is not confirmed. The division of genus Longaeviceras into Longoceras and Longaeviceras (including subgenus Soaniceras) is discussed. According to Cardioceras maltonense found in the upper part of the section studied, the age of the Oxfordian beds is defined more accurately.

中文翻译：

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来自北西伯利亚的上部卡洛维亚Am虫菜心虫科

摘要

提出了对来自阿纳巴尔湾东海岸（西伯利亚北部第109条）的卡洛夫am虫Longaeviceras和密切相关的分类群的研究。在此之前未知的属和物种，例如Rondiceras milaschevici，Pseudolongaeviceras densicostatum gen。等。11月，确定了Platylongoceras holtedahli和Pseudocadoceras laminatum。尚未确认研究区域是否存在埃博拉西拉斯属附属区。讨论了Longaeviceras属分为Longoceras和Longaeviceras（包括Soaniceras亚属）。根据Cardioceras maltonense的说法 在所研究部分的上部，可以更准确地定义牛津床的年龄。