Soils are a prominent feature of floodplain environments, and we include them in this section because most of the available information on ancient soils pertains to alluvial examples, aside from those in Quaternary-Recent time.
Pertaining to, contained in, or composed of, alluvium; relating to the deposits made by flowing water; washed away from one place and deposited in another; as, alluvial soil, mud, accumulations, deposits
A deposition of sediment over a long period of time by a river; an alluvial layer
Alluvial soils are soils which consist of earth and sand left behind on land which has been flooded or where a river once flowed. made of soil left by rivers, lakes, floods etc