One of the most important among the distinguished soil sub-types are the “eroded” or “truncated” clay-illuvial soils.
Kabała Cezary, Musztyfaga Elżbieta 2015, 'Clay-illuvial soils in the Polish and international soil classifications', Soil Science Annualhttp://www.degruyter.com/view/j/ssa.2015.66.issue-4/ssa-2015-0038/ssa-2015-0038.xml?format=INT. Retrieved from DOAJ CC BY 4.0 (https://creativecommons.org/licenses/by-sa/4.0/legalcode)