Since the Neogene, the ancient Songhua-Liao River system have undergone several changes with the alternation of fluvial and lacustrine formation on a large scale.
现代松辽水系是在松辽盆地地质构造、古地貌发育的基础上，几经变迁逐渐演变而成的。晚第三纪以来，古松辽水系经历了几次大规模的河湖交替。
The middle Jurassic series Yanan Formation of in Lingwu coalfield is a lacustrine deltaic deposit.
灵武煤田的中侏罗统延安组含煤岩系为一湖泊三角洲沉积。
Major sedimentary facies in the Huanhe-Huachi Formation include lacustrine facies, delta facies, meandering fluvial facies, and interbedded eolian sandstone facies.
而在环河华池组主要沉积了湖相、三角洲相、曲流河相及风成砂岩夹层。
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