Records of the Geological Survey of India, Volume 113, Parts 5-6

activity alluvium altered anorthosite appears associated average bands basalt basalt flows base basin bearing beds block Bombay borehole brown chert clay complex contain Deccan deposits depth developed district drilled dykes east exhibit exposed fault flows fluorite folds formation fragments Geol Geological Survey glass gneisses grade grained granite granulites grey Group hill holes indicated iron Island laterite layers length lignite lower magnetite major material metres mineralisation minerals minor Nagpur Narmada nature observed occasionally occurs olivine phenocrysts phosphorite pigeonite places plagioclase Plate Pleistocene present pyroclastic quartz quartzite range Records region Report represent river rocks samples sandstone schist sediments seen sequence sericite slope soil stream structure surface Survey of India thick thin titles Trap trending tuff unit upper upto valley values varies veins volcanic weathered western zone