. Atoll research bulletin. Coral reefs and islands; Marine biology; Marine sciences. 12 1. LOCATION AND REGIONAL SETTING Aldabra Atoll (latitude 9°24'S., longitude 46°20'E.) lies 260 miles northwest of Madagascar and 400 miles from the East African mainland. With the adjacent islands of Assumption and Cosmoledo, it rises as an isolated mountain in a basin 2000-2500 fathoms deep, bounded to the west by the African coast, to the south by Madagascar and the Comoros, and to the east by the Farquhar and Amirantes Banks and the Seychelles-Mascarene Ridge. Farther north, this basin has been shown to
. Atoll research bulletin. Coral reefs and islands; Marine biology; Marine sciences. 12 1. LOCATION AND REGIONAL SETTING Aldabra Atoll (latitude 9°24'S., longitude 46°20'E.) lies 260 miles northwest of Madagascar and 400 miles from the East African mainland. With the adjacent islands of Assumption and Cosmoledo, it rises as an isolated mountain in a basin 2000-2500 fathoms deep, bounded to the west by the African coast, to the south by Madagascar and the Comoros, and to the east by the Farquhar and Amirantes Banks and the Seychelles-Mascarene Ridge. Farther north, this basin has been shown to contain thick sequences of sedimentary rocks and to have a normal crustal structure (Francis and others 1966). The Seychelles-Mascarene Ridge, clearly defined by the 2000 fathom isobath (Figure 1), appears to be of complex structure. The Seychelles Bank itself is underlain by Pre-Cambrian granite, which emerges to form the main islands (Baker and Miller 1963; Matthews and Davies 1966). Matthews believes, from geophysical evidence, that similar rocks, with later basic dykes, are found between the Seychelles Bank and the Saya de Malha Bank, and again underlying Cargados Carajos Shoals near the southern end of the Ridge. Conversely, the Amirantes ridge, southwest of Seychelles, is. MAURITIUS REUNION^, Z,6 tSLAHOS »*asc* Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Smithsonian Institution. Press; National Research Council (U. S. ). Pacific Science Board; Smithsonian Institution; National Museum of Natural History (U. S. ); United States. Bureau of Sport Fisheries and Wildlife. Washington, D. C. : [Smithsonian Press]
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