天山—阴山横亘于中国北方,组成近东西向的纬向构造带。其间广大区域,包括新疆的北天山、中天山,东、西准噶尔,阿尔泰,甘肃北山,内蒙古大部分以及东北北部,在地层区划上属天山—兴安一级区。区内古生代地层广泛发育,具有类似的生物群,相同的地槽型沉积历史,是组成我国地质构造特征的重要篇章之一。解放前,本区地质调查研究极为 Tianshan - Yinshan spans in northern China, composed of the east-west latitudinal tectonic belt. In the meantime, the vast area includes the northern Tianshan Mountains, the Middle Tianshan Mountains, the east and west Junggar, the Altai, the Gansu Beishan mountains, most of Inner Mongolia and the northern part of Northeast China. The Paleozoic strata in the area have been extensively developed. They have similar biota and the same sedimentary history of the geosyncline. They constitute one of the important chapters of the geological tectonics in China. Before liberation, the geological survey of this area is extremely