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1.
Introduction
InPolandstudiesconcerningtheevolutionofrivervalleybottomshave
beencarriedoutforyearsindiferentlandscapesoftheVistulaandthe
Odercatchmentareas(KozarskiandRotnicki1978,Starkeled.1982,
1987,1990,1991,1995,2001;Szumański1983,1986;Andrzejewski1984,
Śnieszko1985,1995;Teisseyre,1985,1988;RotnickiandMłynarczyk1989,
Florek1991,Rotnicki1991,Błaszkiewicz1998,2005;Andrzejewskietal.
2018andothers).Asummaryofthesestudiescomparedwiththeachieve-
mentsofresearchersinCentralandEasternEuropewaspresentedby
T.Kalicki(2006).DuringnumerousresearchprojectsexploringtheHolo-
ceneevolutionofvalleysinthecatchmentareaoftheVistulaandtheOder,
theshareofbeaversintheevolutionofthefloodplainhasnotbeennoted
sofar.EnvironmentalchangeswhichoccurredinrivervalleysintheLate
GlacialPeriodandinHolocenewereassociatedwithclimatechangeand
increasedanthropopressure.Significantfactorsthatafectedthefeaturesof
thenetworkofvalleysinthelowlandareasituatedwithinthereachofthe
lastglaciationalsoincludedthedead-icemeltingprocessesintheLateGla-
cialPeriodandinearlyHolocene.
FossiltracesofthepresenceofbeaversinthevalleysofPolishrivers
werenotedverylate.In2009,D.AbłamowiczandZ.Śnieszko,basedon
lithologicalandzooarchaeologicalconditionssupportedbyradiocarbon
dating,includingwoodwithtracesofbeavercuts,suggestedthatinthe
