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The relationship between the chemical composition and lithology of Late Glacial and Holocene biogenic deposits of the Żabieniec mire (Central Poland)

Okupny Daniel, Borówka Ryszard Krzysztof, Forysiak Jacek, Twardy Juliusz, Kloss Marek, Żurek Sławomir

Geological Quarterly

2021

Vol. 65, No. 1

art. no. 11

Geochemical and plant macrofossil analyses of the Żabieniec mire deposits and the palaeoenvironmental changes they record of the past several thousand years constitute an important source for palaeogeographical reconstruction of the Polish Lowland. We describe the phases of the basin’s development from the final part of the Plenivistulian (MIS2), through the Late Glacial and the entire Holocene, encompassing changes determined by both regional and global factors in the surrounding environment, and habitat transformations in the limnogenic mire. The kettle-hole infill of the Żabieniec mire is the only documented example in Central Poland of a succession of biogenic deposits exceeding 10 m in thickness in such a setting. Deposition initially took place in a lake environment, which led to a shallowing of the lake that persisted until the end of the Mesoholocene.

Macrofossil reconstruction of preboreal wetland formed on dead ice block: a case study of the Borzechowo mire in East Pomerania, Poland

Słowiński M.

Studia Quaternaria

2010

Vol. 27

3-10

In order to reconstruct environmental changes in the Borzechowo mire, a sediment core was subjected to macrofossil and stratigraphic analyses. The mire is located in the eastern part of the Pomeranian Lakeland (Tuchola F orest, northern Poland). It is a limnogenic mire, formed as a result of terrestrialisation of a water body. The time of basal peat accumulation was estimated by radiocarbon dating as 9860š130 14C BP (Gd-12393) and by palynological analysis as Preboreal. The analysis of macrofossils shows that in that period, considerable hydrological changes took place in the study area. These hydrological changes were caused by melting of dead ice blocks that was commonplace in the Late Glacial and the Early Holocene.

Postglacial palaeoenvironmental changesin the area surrounding Lake Udriku in North Estonia

Amon L., Saarse L.

Geological Quarterly

2010

Vol. 54, No 1

85-94

Multiproxy data (plant macrofossils, AMS 14C radiocarbon dates, grain-size distribution, loss-on-ignition and magnetic susceptibility) from Lake Udriku Suurjärv in North Estonia were used to interpret local environmental changes during the postglacial period between 13 800 and 11 000 cal yr BP. Sediment lithology is complex but can roughly be described as silt overlain by silty gyttja, gyttjaand peat. The macrofossil diagram shows the local vegetation development from Late Glacial pioneer communities to early Holocenecommunities. The vegetation succession started predominately with Salix polaris, which was later replaced by Dryas octopetala. Thediversity of plant macrofossils increased significantly during the warmer part of the Allerod. Both the diversity and the number ofplant macrofossils are low in the Younger Dryas, confirming the severe climatic conditions found during this interval. During the LateGlacial to Holocene transition, aquatic taxa prevail among plant macrofossils. The absence of tree remains among macrofossils of thisperiod suggests that trees were not locally present or were not growing near the studied lake. Proxy data indicate several environmental changes. The sediment composition and vegetation reflect cooler and warmer episodes and confirm that the study area has been freeof ice since 13 800 cal yr BP.