It reflects a sedimentary cycle from progradation to retrogradation and reveals the changing trendency from regression of Anlelin Formation to progression of Xiushui Formation.

• 外扇沉积，反映了一个从进积到退积的沉积旋回，揭示了从安乐林组发生海退到修水组发生海侵的总体变化趋势。