The result shows that, this area develops several sedimentation systems including alluvial fan, fan delta, subsea apron, delta, channel and lake and volcanic rock body.

• 结果表明：该区下白恶统主要发育冲积扇、扇三角洲、水下扇、三角洲、河道、湖泊等多种沉积体系及火山岩体。