“…Previous studies have shown that there are also submerged reefs in many tropical island surroundings and continental shelves, such as the Caribbean Sea (Macintyre,1972;Lighty et al, 1978;Fairbanks, 1989;Hubbard et al, 1990;Blanchon et al, 2002;Jarrett et al, 2005), the Seychelles Islands (Stoddart, 1971), Madagascar (Pichon, 1977;Guilcher, 1988), the Bahamas Islands (Hine and Steinmetz, 1984), the edge of the western Indian continental shelf (Wagle et al, 1994;Colonna et al, 1996;Vora et al, 1996;Dullo et al, 1998;Rao et al, 2003) in the Indian Ocean, Papua New Guinea (Guilcher, 1988;Galewsky et al, 1996), the Fiji Islands (Guilcher, 1988), the Hawaiian Islands (Veeh, 1966;Ku et al, 1974;Szabo et al, 1994;Muhs and Szabo, 1994;Muhs, 2002;Webster et al, 2004Webster et al, , 2010Hearty et al, 2007), the outer edge of the Florida continental shelf (Lighty, 1977), and the Gulf of Carpentaria (Harris et al, 2004) and the outer edge of the Great Barrier Reef (GBR) (Veeh and Veevers, 1970;Harris and Davies, 1989) in Australia in the Pacific Ocean. These submerged reefs in the continental shelves, such as the 1300 km-long submerged reefs distributed on the outer edge of the western Indian continental shelf (Vora et al, 1996), were mainly formed during the last glacial period, whereas the submerged reefs around oceanic volcanic islands, such as the Hawaiian Island of Lanai (Webster et al, 2010), have longer formation histories Compared with modern coral reefs, submerged coral reefs not only reflect the shelf...…”