POZYCJA STRATYGRAFICZNA OSADÓW DOLNEGO PLEJSTOCENU W POŁUDNIOWEJ CZĘŚCI NIZINY POŁUDNIOWOPODLASKIEJ - DYSKUSJA MERYTORYCZNA

Abstract

STRATIGRAPHICAL POSITION OF LOWER PLEISTOCENE SEDIMENTS IN SOUTHERN PODLASIE LOWLAND - DISCUSSION

Abstract. Sedimentological analysis were preformed on samples taken from three boreholes: Budziska (Okrzeja sheet), Wola Chomejowa and Kolonia Bronisławów (Adamów sheet) drilled for need of the Geological map of Poland in a scale 1:50,000 in the southem part of the Southem Podlasie Lowland. Same significant discrepancies in certain features of the sediments are observed: high share of rounded and frosted quartz sand grains show aeolian environment of sedirnentation. However according to the results of palynołogical analysis, the sediments were deposited in Miocene or Eocene periods, when aeolian processes are thought to be rather absent. Moreover, results of heavy minerals analysis and sieving analysis allow to infer that sediments lying under glacial till of San l can be correłated with the end of Preglaciation or with a period directly preceding oldest glacial transgression in this area, the Narevian Glaciation. During climate deterioration aeolian processes intensified in the periglacial zone south of the maximwn glacial extend. Wind transported material was accumułated in river valleys. Neogene flora found in these sediments was probably redeposited and originated from older sediments eroded by the pra-Warta or pra-Krzna rivers.