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66 D. Nalepka

Ag) and pen ty silts (Th, Ag) were analysed in both cores: a section, 1.20 m thick, from PI 17 every 30 cm and from PI 40, c. 0.40 m thick, every 2-7 cm.

A c. 50 cm core containing peats (Th), gyttja (Ld) and sand (Ga) with gyttja, clay and peat (Ld, As, Th) was taken from the peat bog Wielkie Błoto near Szarów (Lipka 1973; Nalepka 1989). This sediment (Pel 4) was analysed every 2 and 3 cm.

RADIOCARBON DATING

Ali of the profiles cited were dated by the radiocarbon method (Tab. 1). The datings were madę by M. F. Pazdur in the ¹⁴C Laboratory in Gliwice. At the present stage of palynological research, the ¹⁴C dates are the main ground for distinguishing the chronozones in the pollen diagrams and for their mutual correlations. Both ¹⁴C dates and palynological results do agree together. Only the datę of 11250±150 years BP (GD-4243) for the profile Pel 4 is too old when pompared with the palynological results because the dated materiał was taken at the boundary of different sediments. The datę of 9520 ± 110 years BP (GD-5055) for the profile Dr 10 refers to rebedded sediments.

DEVELOPMENT OF THE VEGETATION

THE B0LLING CHRONOZONE

This zonę is described on the basis of the whole diagram Pł 17 (Fig. 2) and of the deepest sample obtained from PI 86-1 (Fig. 3).

P0DŁEZ0WKA PŁ17

ANALONALEPK:'

Fig. 2. Simplificd pollen diagram from the Podfężówka 17 site

Pi-- Co - Picea + Corylus: AsiAg - Argilla steatodes or A. granosa; U - Limus detrituosus: Ga - Grana armoso . Th - Twk

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