Fluvisols
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Fluvisols typically are young soils in alluvial, deltaic, lacustrine, or marine deposits, and occur all over the world.
Characteristics
Soils having fluvic soil material starting within 25 cm from the soil surface and continuing to a depth of at least 50 cm from the soil surface. They have no diagnostic horizons other than a histic, mollic, ochric, takyric, umbric, yermic, salic, or sulfuric horizon.
Acid sulphate soil of the Bangkok Plain, Thailand (Gleyi-Orthithionic Fluvisol; ISRIC reference soil TH 001)
Jarosite mottles in the sulfuric horizon of an Orthithionic Fluvisol, the Netherlands
Layered sediments in a recently empoldered area, the Netherlands
(Calcari-Gleyic Fluvisol)
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