Physiography of northeast india
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The North East India region is physiographically not a homogenous unit and the present coniguration of this region has taken shape during geologically recent time. But the ultimate result of vaious geological events took place through the geological past. North East India consists of very ancient Archaean and Shillong series rocks exposed in several parts of the Garo, Khasi, Jaintia and Karbi Hills. These rocks are similar to rocks exposed in the rest of the peninsular in Bengal and Bihar of which this was a part at one geological time. All these old rocks form the basement for very much younger Tertiary sediments in upper Assam.
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