ANTIFORM AND SYNFORM     

An upward closing fold. Not related to the stratigraphy. It could be an anticline or a syncline, depending on whether the core contains relatively older or younger rocks of the sequence. A downward closing fold is called a synform. Not related to the stratigraphy. It could be an anticline or a syncline, depending on whether the core contains relatively older or younger rocks of the sequence. A sideways closing fold is a neutral fold, it could be recumbent if its axial plane is horizontal or reclined if its axial plane is inclined and the plunge of the fold hinge and axial plane dip are equal and the azimuth of plunge and azimuth of axial plane are the same.