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(15.8 ka BP) obtained for one sample taken from one of these hummocks (Gągolin sile — sampling depth of about 2 m) is probably too young (Urbaniak-Biernacka 1992).

J. Goździk (1991) also found dunes of the oldest generation in central Poland, in Łódź environs. These Iow ridges (about 1 m high) of W-S orien-tation were formed in the Upper P leni vi stu lian, between 19 and 13.5 ka BP.

In the Kielce-Sandomierz Upland M. Barcicki (1997) examined the dune ridge on a W-E alignmcnt, which is 800 m long and about 1.5 m high. TL dating of this dune yielded the following ages: 14.5 ka BP for a sample from the depth of 0.7 m, and 22.5 ka BP for a sample from the depth of 1.25 m. H. Maruszczak (1968,1983) postulated earlier the possibility of preservation of the Plenivis-tulian dunes to the present time. The author of this study published the paper about the Plenivistulian dunes in the Sandomierz Basin, SE Poland (Wojtanowicz 1999).

3. PLENIVISTULIAN INLAND DUNES IN POLAND 3.1. DISTRIBUTION

The distribution of the Plenivistulian dunes in Poland is shown in rela-tion to the occurrence of the Late Glacial dunes and the Vistulian ice-sheet extent (Fig. 1). Both the sites described in literaturę (I, II, III), and examined by the author (Ż, U, K) are marked on the map. The Plenivistulian dunes, which have been found in Poland till now, occur south of the maximum extent of the Vistulian ice sheet. Theoretically, they can occur south of ice-sheet extent during the Pomeranian Stadial (about 15 ka BP) of this glaciation. Therefore, the Wielkopolska region on the Warta and Noteć Rivers, and the Vistula River valley between Warsaw and Bydgoszcz are the areas where the Plenivistulian dunes can also be found.

The Plenivistulian dunes occur in three main physico-geographical re-gions, in which also most of the Late Glacial dunes are present. From the south, these are the following regions: Sandomierz Basin as a part of the Peri-Car-pathian depressions, Central Polish Uplands, and Middle Polish Lowland.

3.2. DESCRIPTION OF THE SELECTED DUNE AREAS

The author of this paper madę the research on the Plenivistulian dunes in three areas: Żuków (Sandomierz Basin), Uściąż (Bełżyce Plain), and Kazanów (Radom Plain). The geomorphologic maps of these dune areas were madę