是岩层中物质成分、颗粒大小、形状及颜色在垂直方向发生改变时所显示的成层现象的纹理，通过其特征可以判别、推测岩体的沉积成岩环境。Stratification refers to the phenomenon that changes of material composition, particle size, particle shape and color in vertical direction in the rock layers cause layered texture. According to its characteristics the sedimentary and diagenetic environment of the rock can be judged or speculated.