Z zagadnień czwartorzędu Kościerzyny

Abstract

On the Quaternary of the Kościerzyna region (Northern Poland) This paper deals with stratigraphy of the Quaternary deposits of the region of Kościerzyna (Northern Poland). It also discusses the origin and characteristics of morphological features that make up the present topography of the region. These features were essentially formed during the Baltic (Wiirm) glaciation and deglaciation. The glacial deposits in the region discussed rest upon uneven preglacial relief, and are comprised of glacial, fluvioglacial and glacio-lacustrine sediments. Their total thickness exceeds 200 m. The oldest glacial deposits recognized in the region of Kościerzyna are boulder clays assigned by the author to the Middle Polish (Riss) Glaciation. The last, i.e. Baltic (Wiirm) Glaciation is represented by 1-4 layers of boulder clay intercalated with fluvioglacial and glacier-lake deposits. An assemblage of morphological features in the north-eastern part of the region investigated originated during the deglaciation. These features include deposited and upsetted frontal moraines, dead-ice moraines, subglacial and melt-water valleys and abundant depressions formed during deglaciation. To the south-west from the above morphological features there are outwash plains. They occur in 5 horizons and represent the dominant features of the landscape. The outwash plains reveal the presence of channels which were presumably occupied by winter or dead ice and therefore could not have been filled with fluvioglacial material.