According to mixed ratio of mudrock,fluid diapir structure can be divided into four types:fracture zone,chaotic fracture zone,mixed sandstone-mudrock zone (or mudlump) and mud volcano.
Research shows that the dawsonite in Hailaer Basin exists in both the eroded volcano tuff and sedimentary volcano tuff,and is paragenous with corrensite and allevardite frequently.
Bad Lands National Park, Mount Rushmore, Black Hills, Devils Tower National Monument, Rocky Mountain National Park, Great Sand Dunes National Park, and Capulin Volcano National Monument.