The local people called saw slate. The local legend of the goddess to a large number of colorful stones. She saw the Shenxianju stone, they asked the mountain stone, God of the hills to the stone here saw down to send. Just saw the half, Nu Wa have good Tianbu, mountain will not continue down saw, leave this saw slate, which is ancient legend version of the "fairy saw." Of course, this is a magical legend, the specific cause of volcanic eruption, crustal movement, weathering and erosion and the formation of geology, known as the fracture, the door.