中白垩世孙宗湾组的沉陷进一步向东侧移，形成了以F1断层为盆缘断层的半地堑；
The subsidence of Sunjiawan episode in Middle Cretaceous are further transferred eastward, and the half-graben defined by the fault F1 was formed.
裂谷盆地半地堑边界正断层的生长可以划分为两种模式：断层简单生长模式和断层生长连锁模式。
The propagation and growth of boundary faults can be divided into 2 types: simple fault propagation pattern and fault growth-linkage pattern.
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