. Collected reprints / Atlantic Oceanographic and Meteorological Laboratories [and] Pacific Oceanographic Laboratories. Oceanography Sediment types The sediment distribution shown in Figures 1 and 2 is based mainly on data obtained from the files of the U. S. Naval Oceanographic Office and supplemented by the work of Arrhenius (1963). For the purpose of this study the sediment types have been divided into six classes: (1) fluvial-marine (sand-silt) representing the 150. Fig. 2 coarser fraction (larger than mm); (2) fluvial-marine (silt-clay), the finer fraction (smaller tha
. Collected reprints / Atlantic Oceanographic and Meteorological Laboratories [and] Pacific Oceanographic Laboratories. Oceanography Sediment types The sediment distribution shown in Figures 1 and 2 is based mainly on data obtained from the files of the U. S. Naval Oceanographic Office and supplemented by the work of Arrhenius (1963). For the purpose of this study the sediment types have been divided into six classes: (1) fluvial-marine (sand-silt) representing the 150. Fig. 2 coarser fraction (larger than mm); (2) fluvial-marine (silt-clay), the finer fraction (smaller than mm) of material derived from terrestrial drainage; (3) "red clay" is a term applied to inorganic pelagic clays which vary considerably in color, but are usually chocolate brown; (4) calcareous ooze is used here to define sediment composed of at least 30 per cent calcium carbonate which is in the form of skeletal material from various planktonic animals and plants; (5) calcareous sand and silt consist of shell fragments and coralhne debris of sand and silt-size particles; (6) siliceous oozes are deposits containing 30 per cent or more of siliceous skeletal material derived from either diatoms or radiolarians. Pelagic sediments of the North Pacific show several conspicuous diff"erences from those of the North Atlantic basin (Figs. 1 and 2). The percentage of sea floor covered by "red clay" is at least four times that found in the North Atlan- 36. 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 Atlantic Oceanographic and Meteorological Laboratories; Pacific Oceanographic Laboratories; United States. Environmental Science Services Administration. Research Laboratories; Environmental Research Laboratories (U. S. ). Washington, D. C. : U. S. Dept. of Commerce, Environmental Science
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