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2 Studia Geologica Polonica

2 1998

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Middle Pleistocene lake deposits in southern Podlasie (eastern Poland)

Lindner Leszek, Marciniak Barbara

Studia Geologica Polonica

1998

Vol. 113

65--83

This paper focuses on the results of geological and diatom investigations of the Mazovian Interglacial, that provide a basis for the reconstruction of ancient lakes in southern Podlasie. The deposits of a younger lake series, dated to the anaglacial part of the Liviecian Glaciation and to the initial part of the Zbójnian Interglacial have been analyzed. Four types (A-D) of ancient lakes, as well as the sequence of glacial and glacifluvial deposits occurring above, have been described with an attempt to establish their age and range of the Scandinavian ice-sheet during the Odranian and/or Wartanian Glaciation.

Diatom stratigraphy of the Mazovian Interglacial lacustrine sediments in southeastern Poland

Marciniak Barbara

Studia Geologica Polonica

1998

Vol. 113

7--64

The sediments of fossil lakes at Adamówka, Krępiec and Biała Podlaska are here the object of biostratigraphic comparison and correlation on the basis of diatom analysis. These sediments fill various lakes that have developed during, or shortly after the Sanian 2 Glaciation. Adamówka and Biała Podlaska represent small, shallow, melt-out lakes, whereas Krępiec represents a larger, deeper lake created in a postglacial valley of tectonic origin. Four Local Diatom Assemblage Zones were determined at Adamówka and Krępiec and five zones in Biała Podlaska. These local zones correspond to the three and four pollen periods, respectively, of the Mazovian Interglacial. The Adamówka site is characterized mainly by the Cyclotella-Fragilaria flora, the Biała Podlaska site by Fragilaria-Cyclotella-Aulacoseira and Krępiec by Stephanodiscus-Cyclotella-Aulacoseira-Fragilaria. The identified diatom succession and the presence of characteristic diatoms (Cyclotella comta/or C. radiosa var. lichvinensis and var. pliocaenica, C. cf. temperiana and C. vorticosa/or C. schumannii) evidence the same age - Mazovian (=Holsteinian, Likhvinian, Alexandrian) Interglacial, in accord with the palynological data.