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alignment axis bands bank basin belt Bihar block bodies boreholes Brahmaputra river carried channel clay Code Complex comprises construction continued covered deposits depth detailed Disang district drilling east Eastern Engineering excavation exposed extension fault field flood folds Formation foundation geological mapping Geology Division geophysical gneiss gold grade grained granite grey Group hills holes indicate irrigation joints limestone located Lower major material mineralisation nature observed occur Operations Orissa phyllite places Pleistocene present proposed quartz quartzite Quaternary ranging recorded Regional represented reservoir river road rocks samples sand sandstone scale scheme schist sediments sequence sericite shale shear zone Shillong shows siltstone slope soil Special Investigation spillway sq km strike structures suggested surface survey thick traverses trending tunnel types units Upper valley varies veins volcanic West zone