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GEOLOGICAL SURVEY OF INDIA
A K Mishra and U K Behera 7
Q system of rockmass classification in tunnels
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anorthosite associated authors bands base basin bauxite bearing beds belt block body clay coal colour complex contain cover crystals deposits developed direction district east eastern Eocene exposed extensive facies fault field flow folds followed Formation garnet Geol Geological Survey gneiss grade grained granite green grey Group hills indicate joints lands laterite lignite limestone lower magnetite major manganese mapping margin material metamorphism mica minerals mining minor nature Nummulitic observed occur ophiolite origin pegmatites phyllite places plagioclase plain Plate Pradesh present quartz quartzite range ratio recent recorded reflectance regional Report represented resulted river rocks samples sand sandstone schist seam sediments seen sequence sericite Shale shows soil stone structures suggest surface Surv Survey of India Table thickness thin tion trend unit Upper valley values varies veins western zone