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.

经原恢复二台群分为三个组：岭组，黄顶子组及烧组，其原建造分别为火山建造、碳酸盐建造及碎屑建造。