. The Earth beneath the sea : History. Ocean bottom; Marine geophysics. SECT. 3] ESTUABIES, DELTAS, SHELF, SLOPE 625 sand fraction may be very large, and it decreases on tidal fiats and salt marshes, where much higher clay contents occur. Examples of this distribution are found in the Wadden Sea, West Friesland (Fig. 6), off Cuxhaven, East Friesland (Gellert, 1952), and in North Friesland (Hansen, 1951). True sand may be seen on parts of the outer watts bordering the North Sea and the English Channel, and also on tidal flats behind sand-spits in Kerry, Ireland (Guilcher and King, 1961). This i
. The Earth beneath the sea : History. Ocean bottom; Marine geophysics. SECT. 3] ESTUABIES, DELTAS, SHELF, SLOPE 625 sand fraction may be very large, and it decreases on tidal fiats and salt marshes, where much higher clay contents occur. Examples of this distribution are found in the Wadden Sea, West Friesland (Fig. 6), off Cuxhaven, East Friesland (Gellert, 1952), and in North Friesland (Hansen, 1951). True sand may be seen on parts of the outer watts bordering the North Sea and the English Channel, and also on tidal flats behind sand-spits in Kerry, Ireland (Guilcher and King, 1961). This is connected with processes of deposition which are considered below. As a consequence of the wide range of the grain size in muds, the sorting. Fig. 6. Lutite {25%; 9: marshes. is always much poorer than on beaches and in submarine sands on the shelf where strong currents act upon them. In deltas, the sorting is also poor, and the grain size is even more variable than in estuaries: the sediments can include large pebbles in Mediterranean deltas, such as the Var delta in south-east France, while in the Mississippi delta the coarser fraction consists of fine sand. On the other hand, the particles are not the same in all parts of the deltas, since they depend on the processes of deposition (see below). Estuarine and deltaic sediments also contain an organic fraction, consisting of algal particles, small pieces of roots, remnants of planktonic animals, and so on. The organic fraction sometimes constitutes a large volume, and it leads, either in fresh or in salt water, to the formation of suspended flakes in which. 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 Hill, M. N. (Maurice Neville), 1919-. New York : Interscience Pub.
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