Alluvium

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  • (archaeology) sediment (mud, sand, and gravel) laid down by flowing water. The largest particles (sand and gravel) tend to accumulate within the channel itself. Particles of clay, silt, and fine sand are small enough to be suspended in flowing water. When the stream overflows its banks, these particles can be distributed across the valley floor. These overbank or flood deposits are the most common contexts in which buried archaeological sites are found. Stream valley floors are underlain by deposits of alluvium and often contain buried archaeological sites..
  • (geology)
  1. A deposit of sediment left by a stream on the stream's channel or floodplain.
  2. A general term for clay, silt, sand, gravel, or similar unconsolidated detrital material, deposited during comparatively recent geologic time by a stream or other body of running water, (1) as sediment in the bed of the stream or on its flood plain or delta, (2) as a cone or fan at the base of a mountain slope; esp., such a deposit of fine-grained texture (silt or silty clay) deposited during time of flood. Syn: alluvial deposit; alluvion. AGI
  3. A driller's term for the broken, earthy rock material directly below the soil layer and above the solid, unbroken bed or ledge rock. Etymol: Latin alluvius, from alluere, to wash against. Plural: alluvia; alluviums. AGI
    Source: Dictionary of Mining, Mineral, and Related Terms


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