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Radiocarbon age of late pleistocene glacigenic sediments in jonionys section of Merkine (Eemian) interglacial

Gaigalas A., Pazdur A., Pawlyta J.

Geochronometria

2001

Vol. 20

75-80

The stratotype of Merkine (Eemian) interglacial in Lithuania is the Jonionys section near Merkine town in south Lithuania. The lacustrine sediments containing rich fossil flora in this section were formed under the conditions of Merkine interglacial and Nemunas (Vistulian) glacial. The fossil-bearing Merkine deposits are overlain by a probably complete sequence of Early Nemunas and partly of Middle Nemunas deposits. Rewashed till-covered organic sediments were found in the upper part of Jonionys section. The exact age of glacial sediments of this section has remained largely unknown. Peat with wood remnants under the rewashed till have been investigated in Gliwice Radiocarbon Laboratory (Gd-10825: 31,500+2300/-1800 BP and Gd-14000: >31,000 BP). Its deposition probably took place just before the maximum of the last glaciation. In Jonionys section the Merkine interglacial, Early and Middle Nemunas nonglacial sediments were probably accumulated in the time of climatic fluctuations, but without glacigenic sedimentation. The glacigenic sediments in the upper part of Jonionys stratotype section are younger than 30,000 BP and belong to the Late Nemunas glacial maximum. Recent radiocarbon dating are important for the establishment of the standard area of the European Würm (Vistulian, Valdaian, Poozerian and Nemunas) glacial.

Radiocarbon age of organogenic sediments in Lake Jasień subglacial channel and their paleogeographical significance

Florek W., Pazdur A.

Geochronometria

2000

Vol. 18

41-46

The dating of 26 deposit samples taken from the Lake Jasień subglacial channel and from its immediate vicinity made it possible to determine when the floor set of peat deposits, commonly occurring at the bottoms of lakes and peat bogs, was formed. Spatial and altitude differentiation of replacement time of the palustrine-peaty accumulation by the limnic accumulation gave a chance to settle the range of Lake Jasień reach changes and their chronology. Also the dating of peat layers in top parts of the organogenic sets filling the hollows neighbouring the lake served this purpose. The attempts to use the gyttja dating to solve the stratigraphic problems of investigated area have failed.