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not comparable
Pertaining to the soil deposited by a stream. quotations examples
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.
1992, Anna K. Behrensmeyer, Robert W. Hook, “Paleoenvironmental Contexts and Taphonomic Modes”, in Terrestrial Ecosystems through Time, page 35
countable and uncountable, plural alluvials
(countable) A deposition of sediment over a long period of time by a river; an alluvial layer. examples
Alluvial soil; specifically, in Australia, gold-bearing alluvial soil. examples