"Forced folds" is an unusual term for those folds that are required to form geometrically as the result of another process. A common type of fold results because of movement along irregularly-shaped faults. These are termed "fault-bend folds" and you can see an example by clicking here. Other folds can develop as a result of sediments draping over pre-existing basement topography. Others again can form as a consequence of magma being intruded - inflating a magma chamber. You can return to the menu on the types of folds by clicking here.