Records of the Geological Survey of India, Volume 96

alteration analyses appears associated Auden band basic bauxite beds bodies brown carried cent central chemical chromite clay colour comparable complex composition concentration contain course crystals deposits developed direction district dolerite dykes earlier east evidence examined exposed faults field flows folded formation formed fraction Geol Geological Survey given grains granite grey hill horizon ilmenite inclusions India indicated intrusions iron later laterite layers less levels limestone Lower mapping margins material minerals multiple nature nodules occur origin phosphate phosphorus places Plate possible present quartz quartzites range recorded reported represent river rocks samples sandstones scarp sediments seen shales silica similar Siwalik soil stage structure suggested suite surface Surv Survey of India TABLE taken thick thin types ultrabasic Upper valley vary veins Vindhyan zone