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abutment Ajmer-Merwara alignment alluvium amphibolites Assam Assistant Geologist bands Barakar bauxite beds belt Bihar biotite Bombay carried cement cent Central Provinces charnockites chromite Circle clay cleavage coal coalfield coarse colour Cuddapah Cumbum dam-site Datia days with effect deposits depth district east Engineer epidiorites examined feet felspar fossil furlongs garnet Geological Survey geophysical gneisses Godavari Gondwana grains granite graphite grey gypsum headquarters hill hillocks ilmenite inches India investigation iron khondalites Kurnool Kurnool district laterite limestone lode Madras magnetite mapping material Messrs mica miles million tons minerals mines nala occur Orissa outcrop patches pegmatite phyllites plateau Pradesh Quantity Value quarries quartz quartzites railway reported reserves ridge river road rocks samples sands sandstones seams shales sheet 57 slates soil specimen strike suitable surface Survey of India taluk thickness thin trap trial pits tunnel varying veins village Vindhyan width zone