. Atoll research bulletin. Coral reefs and islands; Marine biology; Marine sciences. m Peat ? Mud m Halimeda Sand IS Oysters sa Pleistocene . Limestone. 1 1 1 1 1 1 1 i rri r 100 200 300 400 500 600 700 800 900 1000 1100 1200 1300 Horizontal distance in meters Figure 5. W-E vibracore cross section across Twin Cays, showing distribution of dominant mangrove facies and locations of radiocarbon-dated samples. All ages are in calendar (cal) years. Four basic facies were recognized in the Twin Cays cores: Mangrove Peat Facies. The mangrove peat, like the peat from Tobacco Range (Macintyre et al., 1
. Atoll research bulletin. Coral reefs and islands; Marine biology; Marine sciences. m Peat ? Mud m Halimeda Sand IS Oysters sa Pleistocene . Limestone. 1 1 1 1 1 1 1 i rri r 100 200 300 400 500 600 700 800 900 1000 1100 1200 1300 Horizontal distance in meters Figure 5. W-E vibracore cross section across Twin Cays, showing distribution of dominant mangrove facies and locations of radiocarbon-dated samples. All ages are in calendar (cal) years. Four basic facies were recognized in the Twin Cays cores: Mangrove Peat Facies. The mangrove peat, like the peat from Tobacco Range (Macintyre et al., 1995), was composed of two types that are related to stages of peat preservation. The uppermost sections were dominated by well-preserved "broad-fibered peat", which ranged in color from brown to reddish brown and generally had a spongy texture of coarse-fibered roots and rootlets. In contrast, the "fine-fibered peat" was usually found in lower sections of the cores and ranged in color from dark brown to black and consisted of a pasty dense texture of fine fibers. This decomposed early peat usually lacked identifiable plant remains. All stages of alteration of peat were found along with a common intermixing with both sand and mud deposits. Halimeda Sand Facies. This facies consisted of a calcareous sand dominated by Halimeda grains in varying amounts of carbonate mud matrix. Molluscs were common and consisted of a wide variety of bivalves and gastropods. Other constituent grains included branching Pontes fragments, echinoid spines, and worm 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 Fishe
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