Is an important type of volcanic rock, rock mass is controlled by faultVertical joint development, which is developed by long-term weathering erosion and water erosion and gravity collapse.

With the formation of both sides, confrontation to Butte steep cliffs ~ ~ middle permeability precipitous giant The big gate que Tianmen landscape. Scenic spots in the typical "door" "East tianmen"""The west" Tianmen Tianmen "" South Gate "etc..