. Atoll research bulletin. Coral reefs and islands; Marine biology; Marine sciences. Figure 21. Brian Hackman watching drillers, Enderbury Island, 1971. diameter, did not get good recovery in the crumbly limestone and gravelly phosphatic sands. Nevertheless we obtained a reasonable idea of the extent of the phosphatic material. Three of the four holes showed the presence of phosphatic sand from a few feet to 8 feet thick that average 5% to 10% P205 at depths of 12 to 45 feet. DRILLING OPERATIONS ON ENEWETOK (1971-1974) I was only involved in some of this work. First in 1972,1 participated in t
. Atoll research bulletin. Coral reefs and islands; Marine biology; Marine sciences. Figure 21. Brian Hackman watching drillers, Enderbury Island, 1971. diameter, did not get good recovery in the crumbly limestone and gravelly phosphatic sands. Nevertheless we obtained a reasonable idea of the extent of the phosphatic material. Three of the four holes showed the presence of phosphatic sand from a few feet to 8 feet thick that average 5% to 10% P205 at depths of 12 to 45 feet. DRILLING OPERATIONS ON ENEWETOK (1971-1974) I was only involved in some of this work. First in 1972,1 participated in the Pacific Atoll Coring Expedition (PACE 1971-1972) when we drill two holes into the Enewetok reef flat to determine the thickness of the Holocene reef section. Later I joined the Exploration Program on Enewetok (EXPOE 1973-1974) that carried out much more detailed coring operations across the island and to the outer edge of the reef flat. The objective was to obtain a better understanding of the reef history in this area preserved in both Pleistocene and Holocene reef sections. This was the last of my field work in the 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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