ABSTRACT
Rocks that possess cleavage may be split into thin sheets along parallel or sub-parallel cleavage planes that are of secondary origin and are formed bythe combined effects of metamorphism and deformation. 1 In any one bed,cleavage is independent of the bedding, which it may intersect at any angle,but because it is influenced by the physical properties of rocks it may changeits attitude in passing from one bed to another (Fig. X-1).
