Symmetrical folds are also called normal folds or upright folds. In such a fold, axial plane is essentially vertical.

Shattering effect is of utmost importance because shattered rocks become: weak in strength parameters of all types; porous and pervious in character.

Ramsay divides all types of folds into three main classes on basis of relative curvature of outer and inner arcs of a fold. They are Class 1, Class 2 and Class 3 folds.

When it comes to fold angle as basis of classification, fold with a fold angle between 10° and 90° is called tight fold.

In any two cross sections drawn mutually at right angles to each or in a dome, a fold of anticlinal character will be seen to emerge. As such, a dome may be considered as a compound anticline.

Folding is a very slow geological process and indicates an effort of rocks in a particular environment to adjust mselves to changing force fields operating on, within or around m.

Flowage folding is principal process of folding in incompetent or weaker, plastic type of rocks such as clays, shales, gypsum and rock salt etc.

Cheveron folds are folds characterised with well-defined, sharp hinge points and straight planar limbs.

Anticlines are defined as those folds in which limbs dip away from each or at crest in simplest forms.

Unlike domes, two cross sections are drawn at mutually right angle directions in a basin show clearly synclinal characters. Hence a basin may be called a compound syncline.