这类岩石缺乏面理构造，是由于矿物颗粒的脆性碎裂，旋转以及颗粒边界的磨擦滑动和扩展而造成的。
These rocks are lack of foliation and resulted from the brittle fragmentation of mineral grains with rotation of grain fragments accompanied by fractional grain boundary sliding and dilatancy.
当床上用品的倾角小于岩石内摩擦角，岩层分离和一些岩石块，在每一块岩石地层滑动沿节理面作为一个整体。
When the dip of bedding is less than the friction Angle of rock, the rock stratum will separate and some rock blocks in every rock stratum may slide along joint surface as a whole.
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