Records of the Geological Survey of India, Volume 112, Parts 2-5

analyses Assam assemblage associated bands barytes base basin bearing beds belt bodies borehole clay coal collected colour composition contain Cretaceous deposits depth developed dipping direction Disang district east Eastern elements exposed fault fauna field folds Formation fossil garnet Geol Geological Survey gneisses Gondwana grains granite Group Hills Himalayas indicate iron length limestone localities located lower mapping marine metamorphism metres minerals minor nature noted Nummulites observed occur olivine ophiolite origin phyllite places Plate Pleistocene present quartz quartzite range recorded region Report represented rocks samples sand sandstone schist seam sedimentary sediments seen sequence sericite Series shale shear southern stratigraphic structures studies suggest surface Surv Survey of India Table tectonic Tertiary texture thickness tion trace traverse trend ultramafic units Upper valley values varies veins volcanics western zone