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Geology of Nepal
The Himalayan arc extends about 2400 km from Nanga Parbat (8,138 m) by the Indus River in northern Pakistan eastward to Namche Barwa (7,756 m) by the gorge of the Tsangpo-Brahmaputra in eastern Tibet . About 800 km of this extent is in Nepal; the remainder includes Bhutan and parts of Pakistan, India, and China.
Since 55 Ma the Himalayan orogeny beginning with the collision of Indian subcontinent and Eurasia at the Paleocene/Eocene epoch , has thickened the Indian crust to its present thickness of 70 km . The northwest tip of India after colliding with Asia seems to have met along the full length of the suture by about 40 Ma .
Immediately prior to the onset of the Indo—Asian collision, the northern boundary of the Indian shield was likely a thinned continental margin on which Proterozoic clastic sediments and the Cambrian ±Eocene Tethyan shelf sequence were deposited .
== Tectonostratigraphic division of Nepal Himalaya ==
, and divided the rocks of the Himalaya into four tectonostratigraphic zones that are characterised by distinctive stratigraphy and physiography. From south to north, these are the Sub Himalayan, Lesser Himalayan, Greater Himalayan, and Tibetan Himalayan zones.
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