|In recent years, the conglomeratic rocks have been extensively used in determining finite strain in rocks but this task is beset with much difficulty since the pebbles are ellipsoidal in shape and the final product of deformation is also the ellipsoidal pebbles. Other factors that complicate the work is the concentration of pebbles in the rock, whether the pebbles are of uniform or nonuniform composition, and finally the initial axial ratios of the pebbles. Apart from this, the original textures of conglomerates i.e., planar, semi planar or imbricate also affects the final results.|
Usually the Rf/ f technique of Dunnet (1969) is used for determination of finite strain in rocks. Above is a photograph of the basal Delhi conglomerate of Barr in Rajasthan, western India which shows very strong deformation, much more than the deformation shown by Bygdin conglomerate in the Soroy area of Norway, first studied for its finite strain by Hossack (1968).