. Atoll research bulletin. Coral reefs and islands; Marine biology; Marine sciences. present. This was followed by about m of lightly cemented A. palmata. which gives way to 8 cm of pavement limestone at the base of the core hole. Four radiocarbon dates were obtained from four species of unaltered coral colonies--Acropora palmata. Porites astreoides. Montastrea annularis. and Diploria sp. (see Fig. 3). These dates were determined at the former Smithsonian Institution Radiation Biology Laboratory using a Libby half-life of 5,568 years and are uncorrected for nC/12C ratios or for secular atm
. Atoll research bulletin. Coral reefs and islands; Marine biology; Marine sciences. present. This was followed by about m of lightly cemented A. palmata. which gives way to 8 cm of pavement limestone at the base of the core hole. Four radiocarbon dates were obtained from four species of unaltered coral colonies--Acropora palmata. Porites astreoides. Montastrea annularis. and Diploria sp. (see Fig. 3). These dates were determined at the former Smithsonian Institution Radiation Biology Laboratory using a Libby half-life of 5,568 years and are uncorrected for nC/12C ratios or for secular atmospheric variations. DISCUSSION A plot of four radiocarbon dates on a minimum sea-level curve for the western Atlantic (Lighty et al., 1982) (Fig. 4) indicates that the Kolocene reef surface at the drill site has never been closer than m to the water surface during the past 4,000 years. 0 > © 03 0) w c o ® jQ a. a. 10 8 7 6 5 4 3 Thousands of years ago Fig. 4. Plots of four radiocarbon-dated samples on a minimum sea-level curve for the western Atlantic (Lighty et al., 1982). Present-day water depth of drill site illustrated on right side of 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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