alluvium

   Generally this term refers to deposits of sand, silt, gravel, and clay laid down by rivers, streams, and washes.  Usually alluvium, or an alluvial deposit (as one might be called), is of relatively recent origin (geologically speaking, less than a few million years old).
   When broad and flat-lying, the deposit could be called an alluvial plain.  Many of the valleys in central Arizona are occupied by alluvial plains.

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