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Geological Survey of India
Sedimentological and basin analysis studies in the Ib river coal fields with special reference
FIELD SEASON 198788
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alignment associated axis bands bank basin belt Bihar blocks bodies carried channel clay Code collected complex construction covered deposits depth detailed district drilling Eastern Engineering Geology exposed extension fall fault feasibility FIELD SEASON flood folds Formation foundation geological mapping Geology Division geophysical gneiss grade granite granite gneiss grey Group grouting hill holes indicate irrigation joints length located lower major measures mica mineral mineralisation nature observed occur Operations Orissa pegmatite places Pleistocene present proposed quartz quartzite ranging recorded Regional REPORTS reservoir river rock samples sand sandstone scale scheme schist sediments shale shear zone Singhbhum slope Special Investigation spillway sq km stage stage geotechnical investigation structure suggested surface Survey taken traverses trending tunnel types units Upper values varies veins West Bengal zone