Two Indian ocean coral knolls

67-71A preliminary assessment of the status of two hitherto unknown coral knolls, one in the Gulf of Mannar and another in the Andaman Sea, representing the respective areas is made. The coral patches together with the shore reef at Kilakarai, the only shore reef now known in the Indian mainland coast, bordering the Gulf of Mannar, are reported. It is suggested that some knolls in the Gulf of Mannar, such as Klinjampaar, may ultimately develop into sand clays by deposition during cyclones. The knoll described from the Andaman sea, the top of which is now exposed in low spring tides, indicates on upgrowth of about 1 fm after it is originally sounded

South indian beach rock

36-40Occurence of beach rock on the South Indian coasts at Sethukarai, Kilakarai, Tuticorin, Kanyakumari and Andaman and Nicobar Islands is reported. The beach rock occurs intertidally on these coasts, mostly near the coral shores. Though the coral shores of Andaman and Nicobar Islands contain predominantly calcareous beach sands, modern beach rock is rare