Abstract
Beachrock and associated carbonate sediments were obtained by dredging and coring on the Fifty Fathom Flat, a submarine terrace at a depth of fifty fathoms (91·5 meters) on the outer continental shelf off Bombay. The beachrocks are iron stained calcarenites composed of oolites and skeletal material cemented together in a fine-grained carbonate matrix. Thin sections show that the rocks are oobiomicrite with a high grain to micrite ratio. The allochems are superficial oolites, skeletal matter and grapestone and pellet intraclasts all of which either charged with iron oxide or glauconitised. Associated sediments on the Flat are glauconitic sand, oolites and coral debris. The karstic topography which is evident from the echograms and the occurrence of beachrock implies that the Fifty Fathom Flat stood at sea-level, probably during the Pleistocene and is now submerged due to eustatic and/or tectonic causes.
Published Version
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