The"plunge"of a fold is the angle between the fold axis and the horizontal within the axial plane Fig.11.11 1g.11.12 Plunging anticline-syncline pairs Note the V outcrop pattern7 Fig. 11.11 The ìplungeî of a fold is the angle between the fold axis and the horizontal within the axial plane Fig. 11.12 Plunging anticline-syncline pairs Note the ìVî outcrop pattern