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Geogruphical Studies Evolution of the Vistula Rłver Valley PL ISSN 0373-6547

DOROTA NALEPKA

LATEGLACIAL AND EARLY HOLOCENE POLLEN DIAGRAMS IN THE WESTERN PART OF THE SANDOMIERZ BASIN PRELIMINARY RESULTS

Palaeobotanical researches were carried out in the western part of the Sandomierz Basin between Cracow and the Niepołomice Forest (Puszcza Niepołomicka). The article contains preliminary results of pollen analysis madę of the Vistula oxbow fills and palaeochannel fills at Pleszów (PI 86-1), Branice (B 15), Grobla (G 3 bis), on the Drwinka river (Dr 10), of the peat bog at Podłęże (Pł 17, Pł 40), and of the peat bog Wielkie Błoto (or Błoto) near Szaro w (Pel 4) (Fig. 1).

METHODS

Materials for this study were collected during the investigation of both abandoned channel fills and peats. Studies aimed at the reconstruction of the Vistula river channel changes were conducted by P. Gębica and L. Starkel (1987), and by T. Kalicki and L. Starkel (1987). Profiles PI 86-1, Pł 17, G 3bis were obtained using the Więckowski corer, Pł 40 and Pel 4 were obtained by means of the 8 cm diameter Instorf corer, whereas Dr 10 and B 15 were taken from the outcrops. Profiles were described according to the Troels-Smith’s system (1955) using a simplified version of symbols on the diagrams.

The samples were acetolysed by Erdtman’s method (Faegri and Iversen 1975). Minerał constituents were removed by decanting and hydrofluoric acid treatment. Samples obtained from PI 86-1, Pel 4, G 3 bis, Pł 17 and Dr 10 were taken with an 1 cm² sampler; tablets containing Lycopodium spores were added in order to calculate the sporomorph concentration (Stockmarr 1971).

Simplified pollen diagrams (Fig. 2 — 8) show the results of pollen analysis. The percentage calculations of trees and herbs were based on the sum AP+NAP excluding aąuatics, reedswamps and spores.

DESCRIPTION OF INVESTIGATED SITES AND SEDIMENTS

One profile (PI 86-1) was taken at the Pleszów site (Fig. 1) being situated in the westernmost part of the Sandomierz Basin. It originated in a palaeochannel located close to the loess-covered terrace edge, c. 2 km east of the Neolithic