Ⅰ.前言松辽平原面积宽广,约35万平方公里左右,西界大兴安岭,北部与小兴安岭相接,东部有张广才岭与长白山脉。在行政区划上包括了辽宁、吉林、黑龙江三省和内蒙的一部分。整个平原均为复盖地区,在解放前对于该区的地质情况和区域构造等缺少研究,了解很少.解放后从55年开始,地质部先后组成了地质队 I. INTRODUCTION The Songliao Plain covers a broad area of ​​about 350,000 square kilometers, with the Greater Xing’an Mountains in the west and the Xiaoxing’an Mountains in the north and Zhangguangcailing and the Changbai Mountains in the east. In the administrative divisions include Liaoning, Jilin, Heilongjiang provinces and part of Inner Mongolia. Before the liberation, there were few studies on the geological conditions and regional structure of the area, and little was known before the liberation.After the liberation from 55 years ago, the Department of Geology has formed a geological team