Transportation (geology)
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In geology, transportation refers to the movement of eroded debris, whether by rivers, glaciers, wind or ocean currents and tides. Particle sizes can vary from tiny clay particles suspended in moving water, to pebbles and boulders. Deposition occurs when the speed of movement of the transporting medium becomes insufficient to hold the particles. Examples of such deposits are: Bunter, Moraine, Overbank, Dunes, Tombolo.
Transportation does not apply to the passive movement of material under the influence of gravity, as might happen to boulders on a scree.
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