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Geochronology and Isotope Geology Division 1833
Central Petrologlcal Laboratories 4450
Central Geophysics Division 5168
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aeromagnetic AMSE Wing analysis ANDHRA PRADESH anomalies bands Barakar Barakar Formation Barren Measures Formation basement basin Bhutan BIHAR block boreholes Calcutta carried Central chalcopyrite chemical clay coal seams Coal Wing copper cores correlation cruise depth developed DISTRICT dolomite dykes east eastern EXPLORATION FOR COAL faults field season geochemical geological mapping Geophysics Division gneisses Godavari Gondwana grade grained granite granite gneiss gravity grey GROUND EVALUATION heavy mineral horizon India indicated intersected isotopic Kamthi lignite limestone located MADHYA PRADESH mafic magnetic Marine Wing migmatites million tonnes mineralisation NW-SE occur Orissa phyllite PRADESH Code Precambrian quartz quartzite range Raniganj ratio Rb-Sr REGIONAL EXPLORATION revealed samples sand sandstone scale schist schist belt seam zones sector sediments seismic sequence shale shelf Sohagpur sq km Stratigraphy sulphide surface surveys thickness tion toposheet trending upto VALLEY COALFIELD varying vibrocores volcanics WEST BENGAL zone