Introduction to Yanghualing: The geological surface of the Yanghualing volcano is a typical cross-section of the tuff flow from steam magma explosions. It is characterized by a texture composed of layers of rocks superimposed on each other. Geologically, it is called "horizontal texture" or "cross-layered" "Principle", they are not sandstone or siltstone deposited in water bodies. It is composed of fine-grained volcanic ash, coarse volcanic scoria, and black basaltic pumice fragments produced when magma rises and explodes when it encounters underground water layers. In geology, it is called gush tuff.