Etapy rozwoju holoceńskiego koryta w dolinie Warty, stanowisko Koźmin-KN
Stages of development of the Holocene channel in the Warta valley, Koźmin-KN site

Summary/Abstract: In the article, the authors analyse the filling of a small palaeochannel of the Warta River cut in the flat and monoto-nous surface of a low terrace at the beginning of the Holocene. Two stages were distinguished in the development of the studiedchannel – limnic, which was recorded in the Preboreal and Boreal by the accumulation of nearly 1-metre-thick gyttja at the bot-tom of the channel filling, and the fluvial stage, related to the functioning of the active channel and recorded by a sequenceof mainly mineral alluvium. The entire channel filling was examined with sedimentological methods, while the gyttja wasinvestigated using palaeobiological methods (palynology, plant macrofossil, fossil Cladocera), geochemical method, geo-chronological method (14C) and also physicochemical features. For the limnic stage, changes in the level of water in a smalllake occupying the studied palaeochannel and fluctuations in the trophy were partially determined. The reconstructions alsoincluded the evolution of vegetation, faunal elements (Cladocera), fluctuations in the content of organic matter, pH, con-ductivity and chemical elements..

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