Abstract

The Zorin and Chingandzha floras significantly differ in their systematic composition, but they are buried at the same stratigraphic level. On this basis, they are considered to be of the same age and are assigned to the Turonian–Coniacian period. The revealed features of the lithological composition of the plant-bearing deposits, their sequence, and the composition of the overlaying volcanic rocks indicate that both floras represent the first stage of the development of the outer zone of the Okhotsk–Chukotka Volcanic Belt. However, they are separated by one or two local geological events, and hence by a significant period of time. It can be confirmed that the Zorin flora was formed and existed earlier than the Chingandzha flora.

中文翻译：

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俄罗斯东北地区晚白垩世Zorin和Chingandzha植物区系的相对年龄

摘要

Zorin和Chingandzha植物区系的系统组成明显不同，但它们被埋在相同的地层上。在此基础上，它们被认为具有相同的年龄，并被划分为土伦-哥尼亚时期。含植物沉积物的岩性组成，其层序和火山岩覆盖层的揭示特征表明，这两个植物区系都代表了鄂霍次克–楚科奇火山带外围地区的发展的第一阶段。但是，它们之间被一两个局部地质事件隔开，因此需要相当长的一段时间。可以确认，佐林菌群的形成和存在早于Chingandzha菌群。