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This zone is geologically as well as morphologically well defined, and consists of a huge pile of highly metamorphosed rocks. It is situated between the fossiliferous sedimentary zone (the Tibetan-Tethys Himalaya in the north, separated by STDS and the Lesser Himalaya, separated by the MCT in the south. This zone has made up of the oldest rocks of Precambrian metamorphic and granitic gneiss. The north-south width of the unit varies from place to place. This zone consists of almost 10 km thick succession of the crystalline rocks also known as the Tibetan Slab. This sequence can be divided into four main units. From bottom to top these units are: Kyanite-sillimanite gneiss (Formation I), Pyroxene, marble and banded gneiss (Formation II) and Augen gneiss (Formation III).