Сериальное издание: Stratigraphy and Geological Correlation
Страницы: 263-280
Аннотация
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).
