Records of the Geological Survey of India, Volume 105

amphibolites analysed Andaman anorthosites appears associated average bands Baratang base basin beds body carbonate chemical clay coal coalfield coalseams common composition concentration conglomerate consists contain copper covered deposition depth described developed direction district east eastern elements Eocene field figs flows folds Formation fossil fracture Geol Geological Survey glacier grade grained gray hill included indicate island length less limestone lines lodes Lower mapping margin material metal Middle Andaman mineral nature observed occur older peak period phase phosphate phosphorite plagioclase Plate Pleistocene present probably pyroxene quartz quartzite range recorded region reported represented river rocks samples sandstone sedimentary sediments seen sericite Series shales shear shows similar soil South stage strike structures suggested surface Survey of India TABLE thickness tion ultrabasic Upper valley values varies veins volcanic younger zone