Simple/Symmetrical fold A simple fold.

This type of fold has two limbs of equal steepness. It results when the two opposing forces moving towards each other are of equal strength.

Asymmetrical fold A asymmetrical fold.

This fold has one limb steeper than the other. It results when one opposing force is greater than the other.

Overturned fold A overturned fold.

This fold has one limb pushed over the other limb, until the axis of fold is almost horizontal and the two limbs are almost parallel. This is formed when one opposing force is very much greater than the other.




A folding is the process by which rocks bend in response to the compressional force. Large scale folding occurred and massive layers of the earth’s crust were uplifted due to compressional force which push toward each other in opposite directions. The uplifted crust formed FOLD MOUNTAINS, example The Hilmalayas.  There are two types of folding:

Anticline- upward direction

i) Anticline is a convex up fold in rock that resembles an arch like structure with the rock beds (or limbs) dipping way from the center of the structure

Syncline- downward (sink)