The map pattern of plunging folds consists of a "V". For anticlines, the fold plunges in the direction that the "V" points. For synclines, the fold plunges in the direction opposite the V. The arrow on the maps of the plunging folds represents the fold axis and points in the direction of plunge.
The map patterns for comparison.
Click to go to Part 10: Map Patterns of Plunging Folds