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GEOLOGICAL SURVEY OF INDIA
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alluvium analysis Andhra Pradesh Assistant Asstt bands Bihar boreholes Calcutta carried Central Circle clay coal coalfield Coll collected completed construction continued covered deposits depth detailed dips Director district Division drilling Eastern Engineer examined exploration exposed fault field folded formations fossils geological Geologists Geophysical gneiss granite groundwater Headquarters hill Hyderabad identified in-Charge India indicated issued laboratory lignite limestone located Long lower Madras mapped Scale measurements meeting mineral mineralisation Mines Northern occurs pegmatite period places Pradesh prepared Project proposed quartz quartzite Rajasthan received recommended Regional Office reports reserve river rock samples sandstone Sarvashri schist seams Senior shale sheets Shri Southern Regional strike studies suggested Superintending Survey Survey of India Technical thickness tion tonnes tubewells tunnel types University Upper valley varies veins water supply West zone