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Wyświetlanie 1-3 z 3
Tytuł:
The influence of redeposition on the anthracological records from the Moravian Karst caves (Czech Republic, Central Europe)
Autorzy:
Nerudová, Zdeňka
Novák, Jan
Powiązania:
https://bibliotekanauki.pl/articles/2085850.pdf
Data publikacji:
2020
Wydawca:
Uniwersytet Rzeszowski. Instytut Archeologii Uniwersytetu Rzeszowskiego. Muzeum Okręgowe w Rzeszowie
Tematy:
Pod hradem Cave
Kůlna Cave
Anthracology
14C dating
Post- depositional processes
Opis:
The study focuses on some methodological problems associated with the research of cave sites. A large amount of anthracological material came from the context of the layers with archaeological material from the Pod hradem Cave (Moravian Karst, Czech Republic). Some samples were determined as Taxus, which in this context would be among the first evidence of yew in the Middle Pleistocene. However, their dating showed significant secondary redepositions. Similar redepositions of material were repeatedly found in the dating of material from the Kůlna Cave (Moravian Karst, Czech Republic). Here, too, in certain parts of the cave, there was secondary redeposited archaeological material in seemingly intact sediments. Both caves were inhabited – Kůlna Cave from MIS 8 to MIS 2, Pod hradem Cave – from MIS 3e to MIS 2. At the same time, intensive post-sedimentation processes took place in both caves, accompanied by the activities of large carnivores inhabiting these caves alternately with humans. The last important factor influencing stratigraphy was the archaeological excavations at the end of the 19th and the beginning of the 20th century.
Źródło:
Analecta Archaeologica Ressoviensia; 2020, 15; 31-43
2084-4409
Pojawia się w:
Analecta Archaeologica Ressoviensia
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Middle and Upper Weichselian Pleniglacial fluvial erosion and sedimenta- tion phases in Southwestern Poland, and their relationship to Scandinavian ice sheet build-up and retreat
Fazy sedymentacyjne i erozyjne środkowego i górnego plenivistulianu oraz ich związek z transgresją i regresją lądolodu skandynawskiego w południowo-zachodniej Polsce
Autorzy:
Krzyszkowski, D.
Kuszell, T.
Powiązania:
https://bibliotekanauki.pl/articles/191674.pdf
Data publikacji:
2007
Wydawca:
Polskie Towarzystwo Geologiczne
Tematy:
Pleistocene
Weichselian
fluvial erosion and sedimention
pollen analysis
14C dating
SW Poland
Opis:
The sequence of Weichselian sediments and processes in SW Poland is almost identical to that of central Poland. Generally, three fluvial units occur, comprising silts and sands coarsening upwards to silts, sands and gravels, with aeolian deposits on top. This suggests very uniform processes throughout the palaeogeographic zone. To the south of this zone, there was extensive loess deposition and glacial deposition to the north. Climatic conditions during the Middle and Upper Weichselian Pleniglacial in SW Poland were similar to those in central Poland and northwestern Europe, though the period of 47-43 kyrs BP was slightly milder in SW Poland (shrub tundra, forest-tundra). Climatic conditions during the periods 38-27 kyrs BP and 23-18 kyrs BP were very uniform throughout central Europe, including SW Poland, though there may have been a strong north-south climatic gradient during the former period, as data from the loessic zone indicate at least patches of boreal forest or forest-tundra conditions in SW Poland at that time. It is also possible that there was a Middle Weichselian Pleniglacial interstadial with a lower age boundary at 25,900 ą 700 years BP, characterised by Pinus-Picea forest with no heliophytes. This interstadial represents the last mild period before the advance of the late Weichselian ice sheet into SW Poland. The Weichselian fluvial deposition of SW and central Poland may have been punctuated by at least three major erosional phases, characterised by similar incision depths during the cold stages. Erosion took place, with certainty, at around 75-60 kyrs BP (Lower Pleniglacial) and 27 kyrs BP, very probably at around 23/22 kyrs and possibly at around 40 kyrs BP, and valley aggradation occurred during the milder stages. The Upper Pleniglacial was characterised by valley aggradation, associated with southward ice sheet advance and restricted fluvial outflow. However, the frequent Middle Pleniglacial Weichselian climatic oscillations did not initiate sedimentation and erosion, they controlled only river discharge and type of fluvial sedimentation and aeolian activity. The occurrence of the erosional and aggradational phases were controlled by the changes in ice volume in Scandinavia, ice sheet build-up and retreat, respectively.
Źródło:
Annales Societatis Geologorum Poloniae; 2007, 77, No 1; 17-38
0208-9068
Pojawia się w:
Annales Societatis Geologorum Poloniae
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Reconstruction of atmospheric lead and heavy metal pollution in the Otrębowskie Brzegi peatland (S Poland)
Autorzy:
Pawełczyk, Fatima
Bloom, Karolina
Jucha, Witold
Michczyński, Adam
Okupny, Daniel
Sikorski, Jarosław
Tomkowiak, Julita
Zając, Ewelina
Fagel, Nathalie
Powiązania:
https://bibliotekanauki.pl/articles/2058587.pdf
Data publikacji:
2019
Wydawca:
Państwowy Instytut Geologiczny – Państwowy Instytut Badawczy
Tematy:
Pb isotopes
pollution
elemental record
human activity
14C dating
210Pb dating
palynological analysis
Opis:
We reconstruct palaeoenvironmental changes since the Late Holocene in the Orava-Nowy Targ Basin, with an emphasis on anthropogenic influence (Walker et al., 2018). This reconstruction employs multiproxy analyses of the Otrębowskie Brzegi poor fen. We combined radiocarbon and 210Pb dating with elemental geochemistry, stable lead isotopes, and palaeobotanical analyses. The core we investigated covers a period from 4200 ± 100 BC to the present, with a peat accumulation rate varying between 0.001 and 0.243 cm y-1. Heavy metal concentrations, Pb isotopic ratios, and a palynological analysis revealed a significant impact of human activities in the past. The highest concentration and accumulation rate of Pb, were found around 1950 AD. The 206Pb/207Pb quotient ranged between 1.168 and 1.223, with average value around 1.198. Most of the interpretation was based on Pb and its stable isotopes; however, other elements were also important indicators of natural and anthropogenic environmental changes. Our results revealed similarities between the geochemical composition of the peatland studied and other peatlands from the Orava-Nowy Targ Basin.
Źródło:
Geological Quarterly; 2019, 63, 3; 568--585
1641-7291
Pojawia się w:
Geological Quarterly
Dostawca treści:
Biblioteka Nauki
Artykuł
    Wyświetlanie 1-3 z 3

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