Lower Tertiary rocks of the Panjab Himalayas are classified under the lower Tertiary system which comprises the Subathu series (upper Palaeocene-Eocene), the Dagshai series (upper Eocene-lower Oligocene) and the Kasauli series (upper Oligocene-lower Miocene). There is perfect stratigraphic harmony between the Subathus and the Dagshais, and the latter, in turn, grade into the Kasauli series. Correlation of the lower Tertiary rocks of India, Pakistan and Burma and their European and North American equivalents is tabulated.