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The Geology and Mineral Resources of the Andaman
Geology of the Coal Measures in the Deccan Trap region
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amounts amphibolites analysed Andaman anorthosites appears associated average bands base basin beds biotite body carbonate Carboniferous carried chemical clay coal common composition concentration consists contain copper covered deposit depth described developed direction district east elements Eocene fauna field figs folds foliation Formation fossil Garhwal Geol Geological Survey glacier grade grains granitic gray hill indicate island later length less limestone lodes Lower mapping margins material metal Middle mineral nature observed occur older origin ortho-amphibolite oxides peak Permian phase phosphate phosphorite plagioclase Plate present probably pyroxene quartz quartzite range Records region reported represented rocks samples sandstone sediments seen sericite Series shales shear shows similar soil South stage stream strike structures suggest surface Survey of India TABLE thickness tion trace Upper valley values varies veins younger zone