Overthrusting and Emplacement of Basic Rocks in Lesser Himalaya, Garhwal, U. P.

The metamorphosed basic rocks, probably emplaced along dislocation zones during overthrusting and facilitating such movements, are persistent at the base of Uttarkashi thrust sheet in the Precambrian-Lower Palaeozoic rocks of innermost Lesser Himalayan region of Uttarkashi, Garhwal. Marked absence of such basic rocks in Tertiary rocks, and along thrusts of Sub-Himalaya and outermost Lesser Himalaya in Garhwal, may be taken as indicating a probable Upper Cretaceous age for these intrusives related to the initial phase of Himalayan orogeny.