The Palaeogene strata in the Damintun depression may be divided into one second-order sequence and two third-order sequences on the basis of lithologic, well logs, outcrops and seismic data.

• 摘要利用岩性、钻井、地震及露头资料，通过对该地区进行层序地层学分析和研究，根据层序界面的识别原则，把大民屯凹陷古近系划分为1个二级层序，两个三级层序。