Position of axial plane: • Symmetrical folds: A symmetrical fold may be an anticline or syncline. • Asymmetrical folds: These folds, anticlines or synclines in which the limbs are unequal in length and dip unequally on either side are termed asymmetrical. • Overturned folds: These are actually folds with inclined axial plane in which both the limbs are dipping essentially in the same general direction. • Isoclinal folds: These are groups of folds in which the limbs are dipping essentially in the same direction and at equal angles. Consequently their axial planes are essentially parallel. • Recumbent folds: These can be treated as extreme types of overturned folds in which the axial plane acquires a horizontal attitude. In such folds one limb comes to lie vertically above the other. • Conjugate folds: In certain cases a pair of folds that are apparently related to each other may have mutually inclined axial planes. The individual folds themselves may be anticlinal or synclinal or their modifications. • Box fold: It may be described as a special type of folds with exceptionally flattened dip and steeply inclined limbs almost forming three sides of a rectangle.