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五台群地层呈东西向分布在恒山东段中部，其北为高角闪岩相的恒山片麻杂岩，两者岩性呈渐变过渡关系，由此萌发出片麻杂岩是五台群地层部分熔融而来的思路。经过填图实践，总结出地层与片麻岩体之间存在着仍属地层范畴的片麻岩层这一无序岩石地层单位，并建立起它的填图标志。与地层呈渐变关系的片麻岩体外貌复杂、边界不清，不同于具有一定侵入关系、边界明显、成分均一的片麻岩体，据此划分了原地片麻岩体与异地片麻岩体两个系列。
The Wutai Group strata are distributed east-west in the central part of the Hengshan section, with the northern part of the Hengshan-gneiss complex in the high-amphibolite facies. The lithology of the two sections has a gradual transitional relationship. Thus, the gneissic complex is a part of the Wutai Group strata Partially melted ideas. After the mapping practice, it is concluded that there is still a stratigraphic gneiss stratigraphic unit between the strata and the gneiss body, and a symbol of its mapping is established. The gneiss body with gradual relationship with the strata is complex in appearance and unclear in boundary, which is different from the gneiss body with certain intrusive relationship and obvious boundary and homogeneous composition. Based on this, the gneiss bodies in situ and the gneiss Body two series.