Records of the Geological Survey of India, Volume 99

alignment Assistant associated Asstt bands Bihar Block boreholes carried Central Circle clay coal coalfield collected completed comprises consists continued copper-ore covered deposits depth detailed developed district dolomite drilling east eastern examined exposed fault field folds formation fossils foundation further Geol geological geological mapping Geologists gneiss grade granite grey groundwater hill holes India indicated joints Laboratory length limestone located Long Lower mapped scale measures metres million mineralisation minerals minor Nummulitic occur Office pegmatite period phyllite pits places Pradesh present Project proposed proved quartz veins quartzite ranging recommended recorded Regional reported reserves river rocks samples sandstone Sarvashri schist seams shale shear sheet Shri slate soil spillway stage strike structure suggested Survey thickness thin thrust tion tonnes trend tunnel types units Upper varying water supply zone