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下二台岩群 ,系下二台地区的奥陶纪变质岩系，遭受强烈的韧－脆性变形的改造，并在后期叠加了热接触变质及动力变质作用。经原岩恢复可将下二台岩群分为三个岩组：盘岭岩组，黄顶子岩组及烧锅屯岩组，其原岩建造分别为火山岩建造、碳酸盐岩建造及碎屑岩建造。下二台岩群具有三种不同变形相的递进演化规律，相应形成三种构造群落：顺层固态流变构造群落、弹塑性弯曲构造群落、断裂构造群落。下二台岩群地层层序从构造层次角度推断自下而上应为盘岭岩组、黄顶子岩组、烧锅屯岩组。
The Xia’erdai Group and the Ordovician metamorphic rocks in the Lower Reaches of Taiwan and Taiwan are subject to the strong transformation of ductile-brittle deformation and superposition of thermal-contact metamorphism and dynamic metamorphism in the later stage. After the restoration of the original rock, the Xia Er Tai rock group can be divided into three rock groups: Panling rock group, Huangdingzi rock group and Shaoguo Tunyan group. The original rock formations are volcanic rock formation, carbonate rock formation and clastic rock put up. The Xia Er Tai rock group has three kinds of evolutional regularities of different deformation facies, and correspondingly, three kinds of tectonic communities are formed: solid-solid rheological structures, elasto-plastic bent tectonic communities and fault tectonic communities. The sequence of the Lower Ersuankou formation stratigraphically deduces from the structural level that it should be Panling rock group, Huangdingzi rock group and Shaoguo tunyan group from bottom to top.