Two major distributaries,trending NW-SE, were the critical factors in control of the disposition and evolution of deltaic depositional features.

• 决口扇、子三角洲朵体的建设和废弃在很大程度上支配了泥炭沼泽发育的范围和泥炭堆积的过程，是造成本区煤层分叉的基本动力机制。