Abstract

A list and short description of the middle Callovian cardioceratid genera from Northern Siberia are given. These are Rondiceras and Stenocadoceras with specified diagnosis and also Bryocadoceras and Streptocadoceras, which were described earlier as subgenera of Cadoceras Fischer. The middle Callovian of Northern Siberia (section 503 at Bolshoy Begichev Island) is divided into the lower Rondiceras milaschevici, Protolongaeviceras arcticoides Zone (as the equivalent of the Kosmoceras jason Zone) and the upper Rondiceras nikolaevi, Stenocadoceras stenoloboide Zone (as the equivalent of the Erymnoceras coronatum Zone).

中文翻译：

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西伯利亚的中古Callovian：炸药和区域划分

摘要

列出了北西伯利亚中部卡洛维氏心形蝗属的清单和简短描述。这些是Rondiceras和Stenocadoceras与指定诊断并且还Bryocadoceras和Streptocadoceras，其中前面描述作为亚属Cadoceras费。西伯利亚北部的中部Callovian（Bolshoy Begichev岛的503节）被划分为较低的Rondiceras milaschevici，Protolongaeviceras arcticoides区（相当于Kosmoceras jason区）和较高的Rondiceras nikolaevi，Stenocadoceras stenoloboide区（相当于冠状线虫区）。