Retisols occur mainly in the moist and cool temperate regions (dominantly regions with a cool continental climate), particularly in Eastern Europe and central USA/Canada.
Soils having an argic horizon (a subsurface horizon with distinct higher clay content than the overlying horizon) within 100 cm from the soil surface. The argic horizon has an irregular upper boundary resulting from "albeluvic tonguing".
“Albeluvic tonguing” : remnants of the argic horizon (lower part) embedded in whitish (“albic”) material (upper part)
Retisol, Germany, with a whitish and structureless eluvial horizon penetrating into the underlying, strongly prismatic argic horizon; groundwater stands at about 1 m depth (Silti-Gleyic Albeluvisol WRB 2006)
Horizontal section through the argic horizon of an Retisol, showing the polygons of albeluvic tonguing (Zoniën Forest, Belgium)
Polygonal rooting pattern of an uprooted beech tree on Retiisols (Zoniën Forest, Belgium)