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Holocene marine ingressions in the coastal zone of the Pomeranian Bay based on radiocarbon assays

Borówka R. K., Cedro B.

Geochronometria

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2011

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Vol. 38, no. 1

85-92

EN

In recent years, a team at the Geology and Paleogeography Unit, Marine Sciences Institute, University of Szczecin, has been performing geological, geochronological and paleogeographic surveys in (i) the Szczecin Lagoon and Świna Gate Sandbar and (ii) the estuary section of the Rega river valley near Mrzeżyno. These studies have helped to examine and identify not only the distribution of fossil marine sediments but also their lithological and sedimentological characteristics. The age of marine ingressions and regressions in the coastal zone of the Pomeranian Bay were determined using approximately 170 radiocarbon assays. It was found that the marine ingression associated with the 'Littorina transgression' was not synchronous at these two areas. It started earlier in the Mrzeżyno area, ca. 8300-8200 cal BP. In that first phase, marine sediments developed as tightly packed sands containing a few fragments of shells. In several profiles, these deposits were separated from the bottom and top with layers of peat, thus allowing an indirect determination of their age. The next phase of ingression began about 7300 cal BP. These younger marine sediments already contained quite numerous shells of marine malacofauna, especially Cardium glaucum, often found in a life position. In the area of the Szczecin Lagoon and Swina Gate Sandbar, the oldest marine ingression started as early as about 7350 cal BP. The quite clear trace is a considerably thicker series of marine sands with numerous sea shells representing marine and brackish-marine environments, including Cardium glaucum shells in a life position, which made it possible to identify the age and the rate of accumulation of marine sands.

2

Evolution of the River Rega valley near Łobez in Late Pleistocene and Early Holocene

Cedro B.

Geochronometria

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2007

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Vol. 28

55-59

EN

The River Rega valley near Łobez was formed by a rapid icesheet degradation. Evolution of valleys of rivers (including the Rega) discharging into the Baltic Sea began in late Plenivistulian; it was then that glacifluvial outwash levels and kame terraces were formed. At that time, the water was flowing southward and further on towards the south-west, in a broad channel. That period was terminated at the turn of Plenivistulian and late Vistulian, when the discharge became directed northwards. The net result was the onset of the formation of the modern Rega valley system, buried chunks of dead ice still in the process of melting. Dead ice melt-down proceeded at the fastest rate during Allerod. It was then that deposits of organic matter were formed, the deposits being most probably remnants of fossil soil. Plant macro-fossils and remains of freshwater malacofauna point to a sporadic occurrence of sediments of a shallow water body which existed on the melt-down site of a huge chunk of dead ice. The thickness of the overlaying mineral cover (up to 6 m) is indicative of a fast sediment accretion rate. Sandy and silty sediments were deposited in synchrony with the dead ice melting. As a result, today’s Rega valley features traces of small melt-water lakes as well as fossil sedimentation basins (underlain by the Allerod organic level), rapidly filled with fluvial and fluviolimnic sediments. Since the Preboreal, the Rega has been flowing along a meandering channel.

3

Charakterystyka petrograficzno-mineralna rumowiska nurtu Odry niżowej

Racinowski R., Coufal R., Cedro B.

Inżynieria Morska i Geotechnika

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1998

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nr 4

180-186

PL

Opis badań uziarnienia rumowiska dennego Odry na odcinku między ujściem Nysy Łużyckiej i Słubicami. Analiza zróżnicowania składu petrograficzno-mineralnego. Zmienna zawartość składników w wydzielonych frakcjach w 13 stanowiskach badawczo-pomiarowych. Analiza odrębności w zawartości głównych składników rumowiska: kwarcu, okruchów skał krystalicznych, piaskowców, łupków, krzemieni oraz materiału antropogenicznego.

EN

Investigations on bottom sediment graining of Odra between Słubice and the mouth of Nysa Łużycka. Analysis of the diversification of the petrographic-mineral composition. Varying contents of components in fractions from 13 research-measurement stands. Analysis of distinct features in the contents of main components of the sediment: quartz, fragments of cristalline rocks, sandstones, mudstones, firestones and antropogenic material.