虽然由于压实作用而弯曲，但砂岩体褶皱很轻微。
Although warped by compaction, there is only slight folding of the sandstone lenses.
燕山早期运动主要为NW-SE向的挤压褶皱作用，断裂带走向开始弯曲变形；
Near NW-SE compressive folding occurred in early Yanshan orogeny, when it began to buckle.
由断层作用造成的地层缩短量等于水平断距；由褶皱造成的地层缩短量等于褶皱弯曲部分的长度减去弯曲剖分的水平距离。
The shortened part due to faulting is equal to horizontal fault throw, and the shortened part due to folding is the difference between a curved formation length and its corresponding "span".
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