. Atoll research bulletin. Coral reefs and islands; Marine biology; Marine sciences. 18. Figure 14. Non-functional hoa which fails to transect the seaward conglomerate platform, northern rim of Hull. channel is now closed by a steep high ridge of storm rubble (Figures 18 and 19). The top of the conglomerate platform along the channel walls stands at to m, and the level of the island surface above the platform at m. These elevations may be compared with those of the active hoa in Profile 1, and with the crest of the algal ridge at m, which may be taken to approximate a datum
. Atoll research bulletin. Coral reefs and islands; Marine biology; Marine sciences. 18. Figure 14. Non-functional hoa which fails to transect the seaward conglomerate platform, northern rim of Hull. channel is now closed by a steep high ridge of storm rubble (Figures 18 and 19). The top of the conglomerate platform along the channel walls stands at to m, and the level of the island surface above the platform at m. These elevations may be compared with those of the active hoa in Profile 1, and with the crest of the algal ridge at m, which may be taken to approximate a datum in the range of Mean Low Water/Mean Sea Level ( a range of perhaps 30 cm). DISCUSSION We now consider the bearing of the hoa of Hull Atoll on the general questions of hoa previously discussed. First: the distribution of the hoa. Active hoa of the kind found on Hull are not found elsewhere in the Phoenix Islands. They are notably absent from the other two 'typical' atolls of Canton and Gardner. Second, on Hull, the hoa are confined to a sector of the northern 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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