下切谷的形成是构造运动和海(或湖)平面共同作用的结果。
The formation of entrenched valley is the mutual effect of tectonic movement and sea (lake) level.
低水位时期坡折带控制了下切谷-低位三角洲沉积体系的发育。
The depositional slope-break belt controls the development of sediment system of eroded valley-low stand delta.
各层序分别由低位体系域的下切谷充填沉积的砂岩、砂砾岩，海侵体系的灰岩、泥灰岩、泥岩、煤和高位体系域的碎屑岩和煤组成。
Each sequence is composed of incised valley sandstone of low system tract, limestone, marl, coal and mudstone of transgressive system tract and clastics and coal of high system tract.
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