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Wyszukujesz frazę "plant macrofossils" wg kryterium: Temat


Wyświetlanie 1-2 z 2
Tytuł:
Plant macrofossils from the Czyżów Complex deposits of the Szczerców outcrop, central Poland
Autorzy:
Myśkow, E.
Krzyszkowski, D.
Wachecka-Kotkowska, L.
Wieczorek, D.
Powiązania:
https://bibliotekanauki.pl/articles/184237.pdf
Data publikacji:
2016
Wydawca:
Akademia Górniczo-Hutnicza im. Stanisława Staszica w Krakowie. Wydawnictwo AGH
Tematy:
fluvial sediments
plant macrofossils
Holsteinian
Czyżów Complex
Central Poland
Opis:
The paper presents the results of research into the plant macrofossils found in the tectonic Kleszczów Graben, within Mesopleistocene sandy sediments. A number of samples were collected at eight locations from river sediments containing variously sized fragments of plants, mostly from greenish sands overlying Neogene sediments. The structural characteristics of the sediments show a cyclic record of the formation of point bars, their washing out at supercritical conditions, and their aggradation by fine-grained material during flow waning. Based on lithological and structural studies, it has been demonstrated that the sands accumulated in an environment of a meandering river, whose valley bottom was covered with fairly dense vegetation, inhibiting the influx of mineral material to the floodplain from the surroundings – the valley or glacial plateau slopes. The aim of further analysis was to identify the plant genera of the individual macrofossils (about 40 specimens). The most numerous macrofossils were observed in the middle layers of the profile, within sandy megaripple structures, where mostly fragments of Fraxinus and Acer wood were present. In other layers, several fragments of Pinus and three pieces of Populus wood were identified. Additionally, young stems of dicotyledonous plants and fragments of rhytidome (the outer bark of a tree) were found. The results are discussed in combination with considerations on the deposition of the Czyżów Complex in the Bełchatów outcrop, and on the occurrence of local flora.
Źródło:
Geology, Geophysics and Environment; 2016, 42, 3; 325-336
2299-8004
2353-0790
Pojawia się w:
Geology, Geophysics and Environment
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Upper Pleistocene palaeoenvironmental changes at the Zwierzyniec site, Central Poland
Autorzy:
Kalińska-Nartiša, E.
Dzierżek, J.
Bińka, K.
Borkowski, A.
Rydelek, P.
Zawrzykraj, P.
Powiązania:
https://bibliotekanauki.pl/articles/2059945.pdf
Data publikacji:
2016
Wydawca:
Państwowy Instytut Geologiczny – Państwowy Instytut Badawczy
Tematy:
pollen
plant macrofossils
glaciolacustrine
Eemian–Vistulian sequence
palaeoenvironment
Central Poland
Opis:
The paper presents the data on an Eemian–Late Glacial sedimentary sequence from the Zwierzyniec site, central Poland. A number of boreholes document one or two organic layers that occur beneath one or two horizons of clayey and silty deposits of ice-dammed lakes. This study demonstrates to which extent the Zwierzyniec site can contribute to a better understanding of the palaeoenvironmental changes during the Eemian–Vistulian time-frame in central Poland. To study it, a multi-proxy approach was applied, involving: palynological and plant macrofossil analysis, study of rounding of quartz grains and morphology of their surface, and investigations of sand mineralogy and till petrography. The results show that a till bed is overlain by a sandy series corresponding to the glacial-interglacial transition. Either one or two distinct peaks of organic accumulation are evidenced by peat horizons. The lower horizon records spectra with hazel and hornbeam, and did, therefore, accumulate in the Eemian. Observed only in some boreholes, the upper peat horizon marks the Brørup (or the lower part of the Rederstall stadial) represented by forest-steppe conditions with patchy mosaics of larch and further transition into sedges and herbaceous taxa. Localized in between the two peat sequences, the sandy horizon marks a long-lasting aeolian transformation with weathering by frost in the Early Vistulian. Again, significant changes of the palaeoenvironmental regime occurred, and are manifested in the one or two horizons of the glaciolacustrine sediments. This corresponded to the last glaciation in the region, when the ice-dammed lakes formed during the Main Stadial.
Źródło:
Geological Quarterly; 2016, 60, 3; 610--623
1641-7291
Pojawia się w:
Geological Quarterly
Dostawca treści:
Biblioteka Nauki
Artykuł
    Wyświetlanie 1-2 z 2

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