. The Earth beneath the sea : History. Ocean bottom; Marine geophysics. SECT. 3] ESTUARIES, DELTAS, SHELF, SLOPE 621 tidal deltas and occur at inlets between barrier islands, as off North Carolina and off Friesland (Fig. 1). They project inwards and outwards, and originate from the slackening of the flood and ebb currents on both sides of the pass. Thus, the concept of a delta is complex and comprehensive; protrusion forms are diverse (Gulliver, 1898-1899); caution is necessary in [ZH] Marsh Above averoge low water mark [^0 to -5m rrn-s to-iomi P77-10 to-20mJ -20 to -30 m Fig. 1.
. The Earth beneath the sea : History. Ocean bottom; Marine geophysics. SECT. 3] ESTUARIES, DELTAS, SHELF, SLOPE 621 tidal deltas and occur at inlets between barrier islands, as off North Carolina and off Friesland (Fig. 1). They project inwards and outwards, and originate from the slackening of the flood and ebb currents on both sides of the pass. Thus, the concept of a delta is complex and comprehensive; protrusion forms are diverse (Gulliver, 1898-1899); caution is necessary in [ZH] Marsh Above averoge low water mark [^0 to -5m rrn-s to-iomi P77-10 to-20mJ -20 to -30 m Fig. 1. Tidal delta and part of Wadden Sea in West Friesland. Inlet over-deepened by tidal scour. (From Waddensymposivim, 1950, p. 448.) B. Description of Tidal Marshes A typical tidal marsh in temperate countries (Fig. 2) includes two main parts. The lower part, which is exposed at low tide and is entirely under water at high ordinary tide, is generally free of vegetation. It is referred to as the slikke in international terminology. Sometimes, it bears a Zostera cover, or mussel banks, or green algae, in the Netherlands and in Ireland (Van Straaten, 1954; Guilcher and King, 1961). The higher part is the schorre (salt marsh in England and in America), which is entirely covered by sea-water only at high spring tides and always bears halophytes. On the schorre proper, or "high marsh", different species of plants are found according to altitude: the most widespread one in Europe is PuccineUia maritima; Aster tripolium and Obione portulacoides are also numerous; with further increase in height, Juncus maritimus is often of common occurrence (see Steers, 1946, for more detail).. 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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