Taking Sunan mining area as an example, the characteristics of sedimentary faces is obtained by analyzing systematically the topography before sediment, the degrees of roundness, the sizes of sand grains and sources of materials.

• 摘要以宿南矿区为例，通过对“四含”沉积物沉积前的古地形、沉积物的颗拉大小与磨圆度、物质来源，得出沉积相特徵。