. The Earth beneath the sea : History . Fig. 5. Mangroves with alternating sand ridges (cheniers) in north-west Madagascar. (Photo. A. Guilcher.) lead to complete dessication of the surface and crystallization of salt during neap tides so that no plant is able to grow there. The pattern of the tidal creeks in mangroves is the same as in tidal flats and marshes in temperate countries. C. Estuarine Mud In estuaries, tidal marshes and flats, the sediments consist principally of mud {vase in French; Schlick in Cerman), a term which is intentionally imprecise, since the sand-silt-clay ratio is extr
. The Earth beneath the sea : History . Fig. 5. Mangroves with alternating sand ridges (cheniers) in north-west Madagascar. (Photo. A. Guilcher.) lead to complete dessication of the surface and crystallization of salt during neap tides so that no plant is able to grow there. The pattern of the tidal creeks in mangroves is the same as in tidal flats and marshes in temperate countries. C. Estuarine Mud In estuaries, tidal marshes and flats, the sediments consist principally of mud {vase in French; Schlick in Cerman), a term which is intentionally imprecise, since the sand-silt-clay ratio is extremely variable in the mud (in American nomenclature, the medium grain size in clay is smaller than [x; in silt it lies between y. and \i; in sand it is coarser than [x). A silt or clay fraction is present in all muds, so that the mud always hardens w hen it dries, whereas sand remains loose. But in some intertidal nnids the medium grain size may be as coarse as 250 y., while in others it may be as small as 2,5 (i, (Berthois, 1955). As a rule, the grain size is coarser in the tidal creeks, where the
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Keywords: ., bookcentury1900, bookcollectionbiodivers, booksubjectoceanbottom
