The Palaeogene system in the southern west sag of the Dongpu depression consists of rift-lacustrine deposits, and is developed with fluvial, delta, alluvial, fan-delta and lacustrine facies.

• 摘要东濮凹陷西洼南段老第三系属地堑型湖盆沈积，主要发育河流相、三角洲相、冲积扇相、扇三角洲相以及湖泊相。