Plunging folds are folds in which the fold axis is not parallel to an imaginary horizontal plane at the earth's surface. The fold axis of a plunging fold tilts into the crust, the compass direction of that tilt is considered the direction of plunge. 5. 6. Do the age and structural (dip of limbs) relationships discussed for anticlines and synclines above apply to plunging folds as well? The outcrop patterns for plunging folds are "horseshoe-shaped." These shapes have one end that is connected and continuous (the closed-end of the horseshoe) and an unconnected end (the open-end of the horseshoe). Towards which end is the direction of plunge for a plunging syncline? Towards which end is the direction of plunge for a plunging anticline? FO1_Block: Horizontal Anticline FO3_Block: Plunging Anticline Rotation Rotation Rotation FOZ_Block: Horizontal Syncline FO4_Block: Plunging Syncline Rotation O