须家河组二、三段构成了一个“不完整”的三角洲旋回。
The 2nd and 3rd members of Xujiahe Formation comprise an incomplete deltaic cycle.
在纵向上，从E31 - E32，从下向上由辫状河三角洲相变为浅湖相，构成了一正旋回沉积。
In vertical, from E31 to E32, it changes from braided river delta to a shallow lake facies, thus, formed a cycle which lithologic character is rough at bottom.
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