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在亚洲大陆的东北部包括中国的北部、蒙古和俄罗斯的东外贝加尔等地区,广泛分布晚侏罗世-早白垩世的古湖盆,沉积了巨厚的陆相地层。在内陆区这些地层由各类沉积岩所组成,而在东部陆缘区则由火山-沉积岩组成。在这些地层中含有丰富的叶肢介、昆虫、鱼类等各类化石。根据系统采集和研究,叶肢介可以划分出下部的 Pseudograpta-Keratestheri- a 群落和上部的 Eosestheria 巨群落。本文仅对前一群落作一初步分析。
In the northeastern part of Asia, including the northern part of China, Mongolia and the eastern part of Russia, the eastern part of Baikal, the Late Jurassic-Early Cretaceous ancient lake basins were widely distributed and the huge continental facies was deposited. These inland formations consist of various types of sedimentary rocks, while in the eastern marginal zone they consist of volcanic-sedimentary rocks. In these strata rich in leaf excerpts, insects, fish and other fossils. According to the system acquisition and research, the phyllotaxy can be divided into the lower Pseudograpta-Keratestheri-a community and the upper Eosestheria gigantic community. This article only makes a preliminary analysis of the previous group.