For example, the limbs of anticline you have just measured dip toward opposite direction and the dip angles are basically identical. In profile, the anticline has a vertical axial plane. This type of fold is called upright fold.

• 例如，你们刚才测量的那一个背斜，它的两翼向相反方向倾斜，倾角基本相等，在横剖面上，这个背斜的轴面是垂直的，这种轴面直立的褶皱叫做直立褶皱。