Some scale of sublacustrine fan deposit was developed in the Liushagang Formation of the Fushan Depression, the Beibuwan Basin.

• 福山凹陷流沙港组内发育一套具有一定规模的湖底扇沉积,其中可识别出浊流沉积、水下泥石流沉积和滑塌堆积3种沉积相单元。