Fangniushan quartzite series consist of coarse terrigenous clastic rock which has been suffered the metamorphism of low green schist facies, contact lines of its top and base are distinct.
放牛山石英岩系为经低绿片岩相变质的粗陆源碎屑岩。顶、底界线清晰，与下伏太古宙变质花岗岩系及上覆中元古界熊耳群均呈角度不整合接触。
The pushing protrusion is formed on a second face of the base sheet at a place corresponding to a domed top of the movable contact.
按压突起形成在基底薄板的第二面上，配置在与可动接点的圆顶状顶点部相对应的位置上。
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