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Alluvial soil can be a mixture of sand, silt, clay, or a combination of all. If the alluvial is a bottom of an old riverbed, there is a high probability that the soil type is clay predominate with an abundant of organic material. If the alluvial is along a river, chances are that it is a sandy alluvial. It the alluvial is on flat land near a moving water source, then it is probably a silty alluvial. The soil will appear chalky if there is an abundant amount of calcite and/or limestone involved. Look for snail shells and seashells to back up this hypothesis. Peat alluvial land usually occurs in lakes and bogs where there are small islands. Stagnant bodies of water should be a dead give away clue.

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Q: Is alluvial soil loamy clayey sandy chalky or peaty?
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