| Summary: | New interglacial sites in the region of theWilga and Okrzejka river valleys at the Żelechów Upland (SE Poland).Summary. Lake sediments of the Mazovian Interglacial were found in boreholes Kasyldów and Wola Okrzejska 48, and deposits of the Eemian Interglacial were discovered in Wola Okrzejska 49 and Szczepaniec boreholes. The pollen succession recorded in the lacustrine sediments in the profiles Kasyldów and Wola Okrzejska 48 is characteristic for the Mazovian Interglacial, and those from the profiles Wola Okrzejska 49 and Szczepaniec typical for the Eemian Interglacial. The biogenic sediments in the Kasyldów and Wola Okrzejska (48) were accumulated in lakes, formed after meltdown of the Sanian 2 (Wilgian) ice-sheet. These sites are located within the Mazovian Lakeland, in the south-east of the Żelechów Upland. The glacial horizon of the Sanian 2 (Wilgian) Glaciation occurs under Mazovian sediments. The fluvioglacial deposits of the Wartanian Glaciation cover the lacustrine sediments. The Eemian sites at Wola Okrzejska 49 and Szczepaniec are located in the Okrzejka River valley, which was formed after the Wartanian Glaciation. The silts of the Wartanian Glaciation occur below Eemian deposits. The sands of the Vistulian Glaciation and peats of the Holocene cover the lacustine deposits of the Eemian Interglacial. These sites are important for stratigraphy of sediments, which fill the Okrzejka, Wilga and Mała Bystrzyca valleys.
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