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Transporting Materials: Carts and wheelbarrows are convenient and often necessary. They are used for transporting materials to the garden including fertilizers, mulches and the like, and for removing crops and waste such as grass mowings and fallen leaves. Whichever type is favored it should be sturdy, run easily and be kept oiled. Low-slung, two-wheeled metal carts of the type illustrated here are especially convenient for amateurs because they are easier to load, unload and move than the conventional wheelbarrow of professional gardeners.
In addition to the main bedding, many sediments show subsidiary stratification that lies at an angle with the major bedding lines. This is called cross-, false-, or current-bedding, and indicates rapid changes in direction and carrying capacity of the transporting medium. Bedding brought about by torrents shows an alternation of coarse, current-bedded materials and fine laminations. Some sediments are very finely laminated—they lie in very thin layers—and exhibit perfectly symmetrical alternations of finer- and coarser-grained bands which may be correlated with seasonal changes.
Bedding.—Sedimentary rocks are characteristically stratified in beds, layers, or strata. These ire indicated by differences in composition, texture, hardness, cohesion, or color. Loose material dropped in water will sort itself according to size.
The larger grains are deposited first and progressively finer material follows. This produces a vertical gradation according to particle size. If the transporting medium moves in a definite direction, the gradation of coarse and progressively finer materials will take place horizontally. If the process is repeated time and again, the deposits will be graded horizontally as well as vertically. |
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