Heim & Gansser 1939, and Gansser 1964 divided the rocks of the Himalaya into four tectonostratigraphic zones that are characterised by distinctive stratigraphy and physiography. From south to north, it can be divided into five latitudinal morpho-tectonic zones and these are :
1. The Gangatic Plain (Terai)
2. The Sub Himalayan (Chure or Siwalik)
3 Lesser Himalayan (Mahabharat Mountain Range),
4. Greater Himalayan, and
5. Tibetan Himalayan zones (Tethys Himalaya).
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