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Koncentracje metali ciężkich (Cu, Zn, Pb, Co, Cd, Hg) w muszlach mięczaków słodkowodnych z obszaru estuarium Odry i wybranych jezior Pomorza Zachodniego

Piotrowski Stanisław

Gospodarka Wodna

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2019

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Nr 2

25--30

PL

Pod względem koncentracji metali ciężkich w muszlach badanych gatunków mięczaków słodkowodnych mamy do czynienia z następującym szeregiem metali: Zn

EN

Heavy metals concentrations in shells of the examined species of freshwater mollusks refer to the following elements: Zn

2

The last Middle Pleistocene interglacial in Lithuania : insights from ESR-dating of deposits at Valakampiai, and from stratigraphic and palaeoenvironmental data

Molodkov A., Bolikhovskaya N., Gaigalas A.

Geological Quarterly

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2002

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Vol. 46, No 4

363-375

EN

The penultimate (Snaigupele, oxygen isotope stage (OIS) 7) interglacial has proved controversial in Lithuania because of palynological similarities between Holsteinian, SnaigupĹlĹ and Eemian interglacial deposits in the Lithuanian terrestrial record. Furthermore, no warm interglacial period has been recognised between the Holsteinian (OIS 11) and Eemian (OIS 5) in the neighbouring Baltic countries, Estonia and Latvia. In this study, we provide electron spin resonance (ESR) dates of two freshwater mollusc shell samples collected from lacustrine sediments at the Valakampiai site which are thought to be Snaigupele in age. Shells analysed gave mutually consistent dates of 116.0 š 10.8 and 110.0 š 12.1 ka with an average age of about 113.3 ka. These dates are thus significantly younger than OIS 7, and more closely correspond to OIS 5 (Eemian). The possible occurrence of this late Middle Pleistocene OIS 7 interglacial episode in Lithuania and other Baltic countries is evaluated with reference to the nearest and most complete long terrestrial sequences from the central and southeastern parts of the East-European Plain.

3

230Th/U and 14C dating of mollusc shells from the coasts of the Caspian, Barents, White and Black Seas

Arslanov K. A., Tertychny N. I., Kuznetsov V. Yu., Chernov S. B., Lokshin N. V., Gerasimova S. A, Maksimov F. E., Dodonov A. E

Geochronometria

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2002

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Vol. 21

49-56

EN

We dated Holocene and Late Pleistocene mollusc shells collected from coastal sediments of the Caspian, Barents, White and Black Seas by means of both a modified 230Th/U method and the radiocarbon method. Essence of the modification is the removal of the surface (about 1/3 of the weight) of the mollusc shells by nitric acid as it may contain adsorbed detrital 232Th and 230Th. The 230Th/U dates of the inner part of the shells do not require detrital correction with the 232Th activity and well agree with the corresponding reservoir-corrected and calibrated 14C ages of mollusc shells with ages between 1300 and 13,500 BP. We tested the modified 230Th/U method on thick-walled and well-preserved mollusc shells from the transgression sediments of the Barentz, White and Black Seas derived during the Mikulino Interglacial (MIS 5e) and the Early Valday Glaciation (MIS 5c). The 230Th/U ages of the inner part of the shells from the Boreal (Eem) transgression sediments of the Barentz and White Seas ranged from 86 to 114 ka and those from the Karangat (Eem) transgression in the Black Sea (Maly Kut and Eltigen sections) from 95 to 115 ka. The new 230Th/U dates of the shells from the section Eltigen ranged from 100 to 125 ka.

4

Differentiation of subfossil populations of snails from Vistulian loesses of Southern Poland

Łopuszyńska M.

Folia Quaternaria

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2002

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nr 73

101-189

EN

Mollusc shells are commonly noted from loesses and loess-like deposits. The typical feature of loessial malaconecrocoenozes is their abundance with relatively low number of species. The strength of specimens, which are different by their nature themselves, has allocated many low-level taxons within particular species. In many cases, the bases for such allocation are metric features of shells. The author has tried to decide the taxonomic question of the most important and the most frequent species which occur in loess deposits i.e., Succinea oblonga, Pupilla muscorum, Pupilla loessica, Trichia hispida, and Arianta arbustorum.

5

Application of the malacological method to solve stratigraphic and palaeogeographical problems on the example of the West Estonian coast

Tavast E., Raukas A.

Oceanological Studies

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1999

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Vol. 28, No. 3-4

45-57

EN

Subfossil mollusc shells are some of the most common remains in marine Quaternary sediments and can give precise information about the palaeogeographic conditions of palaeobasins. This is primarily due to their good preservation and the large number of species. They are widespread in nearly all biotopes and often occur in beach deposits, now lying at some distance inland above the present-day sea level. Molluscs are susceptible to the environment they inhabit and can therefore provide information about the substrata, water depth, salinity, temperature, isotopic composition of water and water-level fluctuations in ancient bodies of water. Molluscs can also be used in the stratigraphic subdivision and correlation of sediments. Conditions for the investigation of subfossil mollusc fauna in Estonia are extremely good. The bedrock in the coastal area consists mainly of limestones and dolomites, which are covered with carbonaceous till and limy aqueoglacial deposits. In Estonian offshore waters molluscs had suitable living conditions and sufficient material to build up the shells. In Estonia the Holocene mollusc fauna is much better preserved than in neighbouring countries.