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1977年5月至7月我们在陕西礼泉、岐山、陇县、宁夏贺兰山及内蒙古岗德尔山等地研究寒武纪地层。这一地区的寒武系出露比较分散,露出的地区交通不便,再加上有些地区黄土覆盖,因而在该区工作有不少困难。这一地区位于华北地台的西部边缘,西边与祁连山地槽区相邻。这两大区的分界线大致在宝鸡、固原至贺兰山南段一线。寒武系呈南北向的条带断续分布。宝鸡向东,寒武系出露在岐山、礼泉以北,呈东西向的条带分布。上述这些地区是华北区寒武系在地台最西部边缘的分布区。从位置上来看,非常重要。
From May to July 1977, we studied the Cambrian stratigraphy in places like Liquan, Qishan, Longxian, Helan Mountain in Ningxia and Gangel Mountain in Inner Mongolia. The Cambrian outcrops in this area are relatively scattered and the traffic in the exposed areas is inconvenient. Coupled with the loess cover in some areas, there are many difficulties in working in this area. This area is located on the western edge of the North China platform and is adjacent to the trough area of the Qilian Mountains to the west. The dividing line of these two regions roughly in Baoji, Guyuan to Helan Shan South line. Cambrian is a north-south strip intermittent distribution. Baoji eastward, Cambrian Department exposed Qishan, north of Liquan, showing the distribution of the east-west band. These areas are the distribution of the Cambrian Department of North China on the westernmost margin of the platform. From the point of view, it is very important.