Geographia Polonica (1988) vol. 55

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Time and dynamics of the Last Scandinavian Ice-Sheet retreat from northwestern Poland

Stefan Kozarski

Geographia Polonica (1988) vol. 55, pp. 91-102

Abstract

A time-scale calibrated in radiocarbon years has allowed the last glacial episode in northern Poland to be ascribed to the interval of ca 22 000-13 200 yr BP and its maximum of approximately 20 000 yr BP. An attempt has also been made to present a map of deglaciation isochrones and to approximate the age of major ice-sheet positions; i.e. the Poznań Phase: 18 400 yr BP, the Chodzież Subphase: 17 200 yr BP and the Pomeranian Phase: 15 200 yr BP. Whilst occupying the main positions, the dynamics of the ice sheet front had varied to a higher degree than it was assumed in the former deglaciation models with special preference for the zonal ice sheet waning model. Evidence has been provided by new studies based on the complex facies analysis of marginal phenomena. It allows construction of more realistic depositional models in order to establish a dynamic tendency (D,) of the ice-sheet front on the basis of depositional efficiency (De) estimation. The procedure by means of which models can be constructed is a new methodological proposal in studying the ice-sheet marginal phenomena produced in low energy conditions.

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Stefan Kozarski, Committee of Geographical Sciences, Polish Academy of Sciences