QUATERNARY TERRACES OF DIFFERENT DOMAINS OF ALAKNANDA & ITS TRIBUTATIES, BEHAVIOUR OF STATISTICALCAL PARAMETERS DOWN THE CURRENT IN BADRINATH _RESHIKESH SECTION, GARHWAL HIMALAYA, UTTTRAKHAND STATE INDIA

The sedimentological study in Alaknanda and Bhagirathi valley in upper Ganga basin has been attempted in parts of de Uttarkashi,Chamoli, Pauri and Tehri districts in parts of QA sheet 53Jand 53 N on1:50000 scale of Garhwal Himalaya U.P;presently known as Uttrakhand State of Union of India.The area of Upper Ganga basin consisting ofAlaknanda,Bhagirathi,Bhilangna,Nandakini, Mandakini, Pindar, Dhauli-Ganga Bal-Ganga,Madhmeshwar Ganga and Berhi Ganga The Alaknanda is chracterised by six terraces followed by Bhagirathi with five terraces,Bhilangna Nandakini four terraces Mandakini/Pindar/Dhauli-Ganga /Balganga three terraces, Madhmshwar Ganga two terraces and Berhi Ganga one terrace,amidst these Alaknanda is trunk stream and others are tributaries.The Alaknanda is the trunk stream of Ganga system, it drains the eastern part of the area of study .The rocks of Alaknanda valley and adjoining area consist of three units viz Central Cryastalline, Garhwal Group and Dudatoli Groups which from north to south are separated by thrust or fault. The Central Crystalline Group in this area consist of of northerly dipping sequence of Kyanite schist,Garnet mica schist quartzites and para amphibolites of Tugnath formation, it is intruded by granite at Ragsi.The main Central Thrust seprates it from Garhwal Groupof rocks.The Dudatoli Group is represented Pauri Phyllite and Kirsu Quartzite which forms the northern limb of Dudatoil syncline. The north Almora Thrust makes it boundary with Garhwal group.The later is divisiable in to Rudraprayga, Lamri, Chamoli and Gawangarh and Patrali Formation which occurs in normal stratigraphic order. It is intruded by biotite granite by biotite graninte at Nainidevi and Mohankal, with tourmaline granite around Chirpatikhal and also by basic intrusive. The Rudraprayg, Lameri and Chamoli formations are equivalent to Uttarkashi Shyalnan and Nagnithhank Formation respectively in Bhagirathi valley.