. Atoll research bulletin. Coral reefs and islands; Marine biology; Marine sciences. Figure 6. Core photo showing leached and recrystallized Manicina areolata in muddy matrix. All of the cored samples collected in this study have been extensively altered in a subaerial environment. Most samples exhibit a mottled pattern of dense light gray microcrystalline limestone with random patches of chalky light brown-to- buff micrite containing a network of open unoriented tubules. These tubules range in diameter from mm to (Fig. 7) and are the only readily visible evidence of organic remains i
. Atoll research bulletin. Coral reefs and islands; Marine biology; Marine sciences. Figure 6. Core photo showing leached and recrystallized Manicina areolata in muddy matrix. All of the cored samples collected in this study have been extensively altered in a subaerial environment. Most samples exhibit a mottled pattern of dense light gray microcrystalline limestone with random patches of chalky light brown-to- buff micrite containing a network of open unoriented tubules. These tubules range in diameter from mm to (Fig. 7) and are the only readily visible evidence of organic remains in these highly altered chalky patches. Coral, molluscan, and echinoid skeletons were found in various degrees of leaching in the dense grey areas. This extensive alteration, including the chalky patches, extends down to the base of the longest core of m collected in Core Hole 4B (Figs. 1, 4). Figure 5. Core photo showing Pontes (each marked with "P") in muddy Figure 7. Close-up of core showing contact between dense (D) light gray microcrystalline limestone and chalky (C) light brown-to-buff micrite with unoriented 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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