Abstract

The Middle Eocene–Oligocene marine sediments and their underlying and overlapping sequences, which are confined to four Cenozoic troughs and two depressions located in the marginal parts of the Mesozoides of the Koryak Upland in the Northeast Asia, are considered. These rocks formed during significant marine transgression, which also spanned adjacent regions of Kamchatka, Sakhalin, and Japan. The division of ancient shelf zone rocks is based on mollusk assemblages, which made it possible to substantiate the correlation of stratigraphic horizons of the upper part of the Paleogene in the entire North Pacific region. The analysis of these assemblages indicated paleoclimate fluctuations (Eocene warming and Late Eocene–Oligocene cooling), which were responsible for the migration of marine paleobiota.

中文翻译：

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东北亚科里亚克高地的海洋古近系：地层学、软体动物、相关性和地质事件

摘要

考虑了中始新世-渐新世海相沉积物及其下伏和重叠序列，这些沉积物仅限于位于东北亚科里亚克高地中生代边缘部分的四个新生代海槽和两个凹陷。这些岩石形成于重要的海侵期间，海侵也跨越了堪察加半岛、库页岛和日本的邻近地区。古陆架带岩石的划分以软体动物组合为基础，这使得证实整个北太平洋地区古近系上部地层层位的相关性成为可能。对这些组合的分析表明古气候波动（始新世变暖和晚始新世-渐新世冷却）是海洋古生物群迁移的原因。