Abstract

The argillic horizon developed in the Weichselian loesses of western Europe can be related to mechanical clay translocation under a cold climate following a period of decarbonatation. In several sites from Brittany to southern Poland where the pedostratigraphical record was preserved, the Bt formation can be mainly attributed to the Bölling Interstadial. Younger events exist also in the Early Holocene. In most of these sites, Holocene pedogenesis is reduced to an acidification or even a podzolization in the former eluvial horizon. In other sites, influenced by anthropogenic activities, it is difficult to analyze the chronostratigraphy of the pedological events. Dynamic conditions for clay translocation and stratigraphical arguments are discussed. This type of argillic horizon is an early phase of pedogenesis, considered to be formed under boreal climatic conditions.

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