. Atoll research bulletin. Coral reefs and islands; Marine biology; Marine sciences. Figure 9. Undercut exposure in the edge of Pond C, Manatee Cay, showing mangrove peat overlying coral framework. Table 2. Radiocarbon Dates Location Material dated Depth below MSL Date From base of mangrove P. divancata 190 ±60 undercut, east side of Pond A, Cat Cay Core from ridge at entrance A cervicorms 70 ±60 to Pond C, Manatee Cay A. cervicorms 780 ±60 Core from northern inner A. cervicomis 510 ±80 ridge, Pond C, Manatee Cay From base of mangrove P. divancata 190 ±60 undercut, e
. Atoll research bulletin. Coral reefs and islands; Marine biology; Marine sciences. Figure 9. Undercut exposure in the edge of Pond C, Manatee Cay, showing mangrove peat overlying coral framework. Table 2. Radiocarbon Dates Location Material dated Depth below MSL Date From base of mangrove P. divancata 190 ±60 undercut, east side of Pond A, Cat Cay Core from ridge at entrance A cervicorms 70 ±60 to Pond C, Manatee Cay A. cervicorms 780 ±60 Core from northern inner A. cervicomis 510 ±80 ridge, Pond C, Manatee Cay From base of mangrove P. divancata 190 ±60 undercut, east side of Pond A, Cat Cay From base of mangrove A. cervicornis 590 ±60 undercut, south side of Pond C, DISCUSSION The Pelican Cays are characterized by an unusual network of reef ridges that are both submerged and emergent, some with mangrove overgrowths. This network of ridges is responsible for the formation of the ponds in this area, which are the habitat of a great diversity of marine life. The distinctive feature of the network pattern is that the ridges commonly intersect at right angles. This pattern is identical to the polygonal karst pattern that Williams (1972) documented on the exposed surface of Miocene limestones in Papua, New Guinea (Fig. 10). Indeed, Purdy and Bertram (1993) used this figure to explain the "peculiar honeycomb pattern" (p. 40) that they observed in shallow lagoon areas in the Maldives. Purdy and Bertram were convinced that preferential reef colonization on polygonal karst relief formed on limestone surfaces during Pleistocene subaerial exposure was responsible for the "honeycomb shoals" (p. 41) 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; Smith
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