As the most common geological structure on the Earth’s crust, a fracture is any separation that divides a rock into two or more pieces. Fractures are commonly caused by geological stress exceeding the rock strength, causing the rock to lose cohesion.

　　The fracture here is a part of Zihu-Fenglin Fracture Tectonic Belt, which developed in Cambrian limestone formation formed about 570 million years ago. The dip direction of the fault plane is 318° and the direction of tilt is 70°, on which striations are obvious.

　　Striations refer to a set of parallel lines formed when the two blocks of a fault are carved by rock fragments in a fracture belt on the fault plane surface, which can indicate the direction of relative movement of the two blocks of a fault.

Do I make myself clear?

　　“Fracture” refers to the dislocation or cracking stratum . It can be classified into three types.

　　Cleavage: slight degree of rupture which does not obviously ruin the continuity of the rock.

　　Joint: a type of rupture where stratum has cracked, but no obviously relative displacement occurs to two rock walls.

　　Fault: the most important category of rupture where obvious relative displacement occurs to two cracked rock walls.