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GEOLOGICAL SURVEY OF INDIA
On Jacobsites from Vizianagaram Manganese Belt of Eastern Ghats Andhra
Fossil Hippopotamus from Quaternary Alluvial Deposits of Narmada Valley
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amount amphiboles analysis assemblage associated average Bankura basement basic Bihar Biotite chemical collected colour composition contain crystals deposit depth detailed distribution district east Eastern Electron elements field Formation geochemical Geol Geological Survey gneiss gold grains granite green higher hill hornblende schist increase indicated jacobsite Kharswan lower manganese massive amphibolite McCluskieganj meta-basic rocks metamorphic metres minerals namadicus Narmada nepheline observed occur plagioclase Pleistocene present present area quartz Quartzite Quaternary range ratios recorded Region representative respective river rocks samples schistose amphibolite sediments sericite shales shear zone similar Singhbhum Singhbhum Shear Zone specimens stream strip structural surface Survey of India syenites temperature texture tion trend types unit Upper valley values variation varies various vein-quartz veins West West Bengal X-Ray