Morphological analyses of thin cross-sections showed that the cyclic processes of freezing and thawing affected the structure of a surface horizon of grey-brown podzolic soil (Orthic Luvisol) derived from silt. It was also noticed that an unwedging pressure of ice resulted in the formation of horizontal fissures and micro-fissures at the contact points of freezing and non-freezing zones. At the same time as thawing, rendering of a clay fraction and its accumulation took place, which resulted in the emergence of numerous horizontal, clayey and silty streaks.