In the outer Himalaya, during the Cenozoic Era, the quiescent phases, between the orogenic impulses, are marked by three successive periods of sedimentation. The principal sedimentary facies are: (1) ‘Black shale facies’ (Subathu) of the Eocene period followed by (2) ‘flysch facies’ (Lower Murree-Dagshai) during the lower part of Lower Miocene Epoch, and finally replaced by (3) ‘Molasse facies’ (Siwaliks) during the Middle Miocene to Pliocene. This succession of facies points to a natural consanguineous association of a group of sediments and such sedimentary cycles have been observed in geosynclinal areas in other parts of the world.