摘要：Geomorphological mapping, three diatom analyses and two 14C dates have been used to describe the development of the relief and the palaeohydrology of the middle course of the Radunia valley in North Poland. Chalk layers found in large areas of the Radunia basin proved to originate from a water phase which covered the valley bottom for some time from the very beginning of the postglacial period. It was at the latest during the Boreal Chronozone, however, that the previously uniform water level was divided into smaller basins, in accordance with a regressive trend. Relief changes during the rest of the postglacial period were mainly due to fluvial processes, the results of which indicate fairly constant hydrological conditions at this time
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