. Soil physics and management. FtG. 26.—Section of marine marsh; 6, grassi marsh; c, mud bank, or mud flats; d, eel-grass. CShaler.) RESIDUAL, GRAVITY-LAID, WATER-LAID DEPOSITS 37 and salt marshes are divided into those above mean tide, as thegrass marshes and mangrove marshes, and those below mean tide,mud banks and eel-grass areas (Fig. 26). The mangrove marshesoccur along the Florida coast and have played a very importantpart in adding to the land area (Fig. 27). The other form ofmarshes occur in more northern regions, the grass marshes being. Fig. 27.—Mangrove marsh, Biscayne, Florida. Thi
. Soil physics and management. FtG. 26.—Section of marine marsh; 6, grassi marsh; c, mud bank, or mud flats; d, eel-grass. CShaler.) RESIDUAL, GRAVITY-LAID, WATER-LAID DEPOSITS 37 and salt marshes are divided into those above mean tide, as thegrass marshes and mangrove marshes, and those below mean tide,mud banks and eel-grass areas (Fig. 26). The mangrove marshesoccur along the Florida coast and have played a very importantpart in adding to the land area (Fig. 27). The other form ofmarshes occur in more northern regions, the grass marshes being. Fig. 27.—Mangrove marsh, Biscayne, Florida. This mangrove advances into thewater by throwing out new roots. (From Elements of Geology. Copyright 1911, byEliot Blackwelder & Harlan H. Barrows. American Book Company, Publishers.) sufficiently high so that they are covered only during the highesttides. The eel-grass banks are always covered, while the mud bankis intermediate between these. Holland is an illustration of whatthe marsh lands may become when drained and protected by dikes,(b) Lacustrine.—Lacustrine or lake-laid dejDosits consist of
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