The paper discusses three new exposures of Pleistocene marine deposits in the Elbląg Upland at Kadyny and Próchnik, and unpublished results of their dating using the TL, OSL and 14C methods . Analysis of these data and the geological setting of the marine deposits, compared with previously published data on the Pleistocene succession in this area, confirm the earlier conclusions that these deposits are of different ages, both interglacial and interstadial. The results of the new research also confirm the previous observations that they occur within one of the intermorainic series of a glaciotectonically disturbed complex of Vistulian Glaciation deposits, referred to as the Kadyny Formation, where they occupy a different position. The interglacial Elbląg Clays from Kadyny and from other sites of the study area are the most common deposits there. They are incomparable with the underlying undisturbed or slightly deformed glaciotectonically deposits of the Eemian Tychnowy Sea in this area, because the sea belonged to the Lusitanian zone, while the Elbląg Clays represent the boreal and arctic seas. According to the new data, it can be assumed that they are deepwater sediments of the Eemian Sea, derived from northern areas of the Baltic Basin and, unlike the sediments of the shallower Tychnowy Sea, which occur here in their original stratigraphic position, they are only glacial rafts transported into the Elbląg Upland by ice lobes during the last stadial of the Vistulian Glaciation. In turn, the marine sediments from Próchnik differ from the Elbląg Clays with many features; they are younger and their ages suggest that they are associated with the intermorainic Kadyny Formation, within which they occur. They were deposited in a cold sea, previously unknown in this region, which occupied the southern part of the Baltic Basin in the older interstadial of the Vistulian Glaciation. These findings entail a necessity to change the rank of the “Krastudian (Elbląg) Interglacialˮ in the Vistulian Glaciation stratigraphic scheme, which is based on research conducted in the years 1970-1990s in the Vistulian Pomerania area, to the “Gniew Interstadialˮ that was previously determined for this stratigraphic position.

Makowska, Aurelia. Morza plejstocenskie elblaskie i z Prochnika na Wzniesieniu Elblaskim = The Pleistocene seas from Elblag and Prochnik, Elblag Upland / A. Makowska. – Warszawa : Panstwowy instytut geologiczny, 2019 - (Prace Panstwowego instytutu geologicznego / Instytut geologiczny (Warszawa) ; Т. 206).Literatura: s. 38-40.