Records of the Geological Survey of India, Volume 98

affected alluvial Alluvium ammonoids appears associated bands Barakar basalt base basins bauxite beds boundary brown chemical clay coal coalfield coast coiling collection conglomerate considered consists deposits direction district east evidence extensive faults fauna ferruginous flowing folds formation forms fossils Geol Geological gneisses Gondwana grains gravel groundwater India indicate Karewas later laterite lateritisation less lignite limit limonite lithomarge Lower major marked material measures metres Middle minerals nature observed occasionally occurs older origin overlying pebbles period pisolites places Plate Pleistocene present quartz quartzites range Recent recorded region represented river rocks sand sandstone sandy sedimentary sediments seen sequence shale silica Siwalik soil stage structures studies suggest surface Surv Survey Tertiary thickness thin trap tubewells Upper valley varies weathering West yield zone