During the late late Permian the epicontinental sea extincted and this area evolved into an inland depression and formed river lake fillings, mainly lake facies.
晚二叠世晚期陆表海消亡，本区转化为内陆坳陷，形成以湖泊沉积为主的河湖充填。
On the basis of the study on the flora characteristic of the late late Carboniferous and early early Permian in the Helan Mountains, the palaeoecology study on this flora has been analyzed.
在综合研究了贺兰山北段晚石炭世晚期和早二叠世早期植物群的特征和性质的基础上，对此植物群进行了古生态学方面的分析研究。
Representative elements of order Albaillellaria firstly appear in Silurian, which prosperous in Late Devonian, and extinction in end-Permian, is the characteristic group of Late Paleozoic Radiolaria.
阿尔拜虫目放射虫最早的代表出现于志留纪，从晚泥盆世开始繁盛，于二叠纪末期灭绝，是晚古生代特有的放射虫类群。
应用推荐