The other is concave upward with younger rocks of Silurian shale and siltstone toward the center of curvature.The former is called anticline and the latter syncline.

• 而另一个褶曲向上凹，较新的志留系页岩和砂岩位于弯曲的中心部位，前者被称为背斜，后者则称之为向斜，褶皱核部两侧叫做褶皱的翼部。