. Collected reprints, Essa Institute for Oceanography. Oceanography Figure 8. Carbon-nitrogen ratios of Chop- tank River surface sediments, given as percent of total weight of sannple. grain sizes. Relatively low organic contentLj are noted in the coarse or sand-sized samples of Group II. The areas of deposition consist main- ly of fine sediments and show marked increases in organic contents similar to the fine-grained sediments of Group II. The carbon-nitrogen ratios in the surface sediments are quite uniform. The average values of these samples were in the normal range for open
. Collected reprints, Essa Institute for Oceanography. Oceanography Figure 8. Carbon-nitrogen ratios of Chop- tank River surface sediments, given as percent of total weight of sannple. grain sizes. Relatively low organic contentLj are noted in the coarse or sand-sized samples of Group II. The areas of deposition consist main- ly of fine sediments and show marked increases in organic contents similar to the fine-grained sediments of Group II. The carbon-nitrogen ratios in the surface sediments are quite uniform. The average values of these samples were in the normal range for open-ocean shelf environments (Emery, I960). These values are, however, quite different from observed ratios in bays and estu- aries known to the authors (and reported by Kofoed and Gorsline, 1962; Stewart and Gorsline, 1962, and Gorsline and Stewart, 1962) in which the ratios average as high as 20. CONCLUSIONS Origin of Sediments It appears that the major contribution of fine-grained sediments to the channel and other areas of silt and clay deposition is from out- side the river system, most probably from the waters of the open bay. Since fine silt and clay particles usually travel along a similar path as. 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 Institute for Oceanography; Atlantic Oceanographic Laboratories (U. S. ); Pacific Oceanographic Laboratories; United States. Environmental Science Services Administration. Research Laboratories. Washington, D. C. : U. S. Dept. of Commerce, Environmental Science Services Administration, Research Laboratories : For sale by the Supt. of Docs. , U. S. G. P. O.
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