Xiaertai rock group,a set of metamorphic rock system in Xiaertai area,has experienced strong ductilebrittle deformation and then thermal contact metamorphism and dynamometamorphism in the late stage.

经原恢下二台群分为三个：岭，黄顶子及烧锅，其原建造分别为火山建造、碳酸盐建造及碎屑建造。