. Atoll research bulletin. Coral reefs and islands; Marine biology; Marine sciences. 19 NATURE AND DISTRIBUTION OF LAGOON SEDIMENTS The bottom sediments of the Tikehau lagoon were characterized by Intes and Arnaudin (1987). Fifty four samples of bottom sediment were taken in various location of the lagoon and subsequently sorted and analyzed in the laboratory. Findings were that the sediments are all calcareous organic sands. They consist of the following chief components : Halimeda segment sand, Foraminifera (family Miliolidae) test sand, mollusc shell sand and miscellaneous debris. Halimeda
. Atoll research bulletin. Coral reefs and islands; Marine biology; Marine sciences. 19 NATURE AND DISTRIBUTION OF LAGOON SEDIMENTS The bottom sediments of the Tikehau lagoon were characterized by Intes and Arnaudin (1987). Fifty four samples of bottom sediment were taken in various location of the lagoon and subsequently sorted and analyzed in the laboratory. Findings were that the sediments are all calcareous organic sands. They consist of the following chief components : Halimeda segment sand, Foraminifera (family Miliolidae) test sand, mollusc shell sand and miscellaneous debris. Halimeda segment sand is the first common material. It is present in almost all samples and predominates in most of them, especially in samples taken in the western part of the lagoon. As shown on Fig. 9, Halimeda segment distribution follows an horizontal west-east gradient and a vertical gradient since its abundance decreases steadily below a 20 m depth. Foraminifera test is the second most common material. Large stretches of foram sand occur on shallow bottoms less than 10 m deep along the southern and southeastern lagoon margin. Moreover, a large foram sand patch extends in the northern central part of the lagoon between a depth of 20 and 35 m. Mollusc shell sand and gravel are never abundant and never dominate the sediment Fig. 9 : Contoured bottom sediment data of Tikehau lagoon characterized by their chief components (H : Halimeda sands, F : Foraminifera sands).. 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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