五台山区前寒武纪地层中,至今已发现七个角度不整合面(表1)。而别的地区变质岩系中不整合面却发现不多,因此有人怀疑五台山区有没有那么多的不整合面?或者五台山区是否太特殊了。我省其它山区的前寒武纪地层中,一般都有四五个不整合面;冀东、鞍本等地也有四 Up to now, there have been seven unconformities in the Precambrian strata in Wutai Mountain (Table 1). However, unconformities in the metamorphic rocks in other areas have not been found. Therefore, some people doubt that there are so many unconformities in Wutai Mountain, or is it too special for the Wutai Mountain? There are generally four or five unconformities in Precambrian strata in other mountainous areas in our province; there are also four in Jidong, Anshan and other places