In gelisols (permafrost soils), cryoturbation (frost churning) refers to the mixing of materials from various horizons of the soil down to the bedrock due to freezing and thawing. Cryoturbation occurs to varying degrees in most gelisols. The cause of cryoturbation lies in the way in which the repeated freezing of the soil during autumn causes the ...
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http://en.wikipedia.org/wiki/Cryoturbation
cryoturbation Disturbance of the soil surface by the action of freezing or of alternate freezing and thawing.
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http://www.wordinfo.info/words/index/info/view_unit/2197/
(1) (singular) a collective term used to describe all soil movements due to frost action (2) (plural) irregular structures formed in earth materials by deep frost penetration and frost action processes, and characterized by folded, broken and dislocated beds and lenses of unconsolidated deposits, included organic horizons and even bedrock.
Found on
https://nsidc.org/cryosphere/glossary?page=5
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