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    Wyświetlanie 1-4 z 4
    Tytuł:
    Pleistocene deposits in the Southern Egyptian Sahara: lithostratigraphic relationships of sedimentsand landscape dynamics at Bir Tarfawi
    Autorzy:
    Hill, Christopher L.
    Schild, Romuald
    Powiązania:
    https://bibliotekanauki.pl/articles/2026009.pdf
    Data publikacji:
    2021
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    sediments
    lithofacies
    stratigraphy
    groundwater
    Pleistocene
    Opis:
    The sedimentological and lithostratigraphic record from north-central Bir Tarfawi documents the presence of Pleistocene basin-fill deposits. Three topographic basins were created as a result of deflation during climate episodes associated with lowering of the local groundwater table. In each case, the three deflational basins or topographic depressions were subsequently filled with sediments; these basin aggradations coincided with changes from arid climate conditions to wetter conditions and a rise in the groundwater table. The oldest and highest sedimentary remnant is associated with Acheulian artifacts and may reflect spring-fed pond and marsh conditions during a Middle Pleistocene wet climate episode. Lithofacies for a lower stratigraphic sequence (the “White Lake”) documents deposition in a perennial lake that varied in extent and depth and is associated with Middle Paleolithic artifacts. A third episode of deflation created a topographic low that has been filled with Late Pleistocene sediments that are associated with Middle Paleolithic artifacts and fossil remains. Lateral and vertical variations in the lithofacies of this basin-fill sequence and the sediments of the “grey-green” lake phases provide a record of changing hydrologic conditions. These hydrologic conditions appear to reflect variations in water-table levels related to groundwater recharge and, at times, local rains.
    Źródło:
    Studia Quaternaria; 2017, 34; 23-38
    1641-5558
    2300-0384
    Pojawia się w:
    Studia Quaternaria
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Revised stratigraphy and palaeogeography of the Rostan Hills in northwestern Ukraine
    Autorzy:
    Rychel, Joanna
    Orłowska, Anna
    Zbucki, Łukasz
    Nowacki, Łukasz
    Zalesskij, Ivan
    Powiązania:
    https://bibliotekanauki.pl/articles/2025050.pdf
    Data publikacji:
    2021
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    ice-sheet dynamics
    petrographic analysis
    lithofacies analysis
    Elsterian ice sheet
    MIS 12
    NW Ukraine
    Opis:
    This paper presents a new approach to stratigraphy and palaeogeography of NW Ukraine. So far, the glacial landforms near the Rostan area have been interpreted as end moraines derived from the Saalian ice-sheet. Sedimentological and petrographic analyses conducted at the Rostan site shed new light on the dynamics and age of the ice-sheet that formed the examined glaciogenic forms. Sedimentological analysis of glacial deposits documented the sedimentary environment of a glaciofluvial fan deposited by the ice-sheet front characterised by varying dynamics, i.e. advancing, stationary and retreating. Petrographic analysis proved an older age of deposits, i.e. Elsterian, and not Saalian as interpreted so far. These results shed new light on palaeogeography and stratigraphy of this area. The occurrence of the Elsterian deposits on the surface gives evidence of the absence of younger – Saalian – glaciation in this area, which relates to the recently announced new approaches to palaeogeography and stratigraphy of neighbouring areas in eastern Poland.
    Źródło:
    Studia Quaternaria; 2021, 38, 1; 33-41
    1641-5558
    2300-0384
    Pojawia się w:
    Studia Quaternaria
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Stratigraphic position of tills in the Orłowo Cliff section (northern Poland): a new approach
    Autorzy:
    Woźniak, Piotr Paweł
    Sokołowski, Robert J.
    Czubla, Piotr
    Fedorowicz, Stanisław
    Powiązania:
    https://bibliotekanauki.pl/articles/2025278.pdf
    Data publikacji:
    2018
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    lithofacies analysis
    petrographic composition
    till fabric
    TL dating
    Middle and Late Pleistocene
    Nauki o Ziemi
    Opis:
    The site at Orłowo Cliff was used to analyse the stratigraphic position and palaeogeographic interpretations of the properties and depositional conditions of two basal tills from the Late Pleistocene. A multi-proxy approach involved lithofacies, petrographic analysis of the fine gravel fraction, analyses of indicator erratics and till fabric. TL dating of intra-moraine deposits was used to determine depositional time frames of tills. The sediment profile at Orłowo Cliff shows a distinct reduction in number of Pleistocene units. Obtained dating results suggest the presence of Middle and Late Pleistocene fluvial units. The main issue discussed is the stratigraphic position of the older till (Unit O-4). It can be assumed that this till was deposited probably during the Middle Weichselian (MIS4). At Orłowo Horn the till of Unit O-4 reveals incorporation of the erratic material derived from an older till in the surrounded area (according to petrographic composition – probably from MIS 8). The younger till (Unit O-6) was deposited in the Late Weichselian (MIS 2). Moreover, the till of Unit O-6 is characterised by a significant shift towards the south-west in terms of the erratic origin in Unit O-4.
    Źródło:
    Studia Quaternaria; 2018, 35; 25-40
    1641-5558
    2300-0384
    Pojawia się w:
    Studia Quaternaria
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    The outwash plain of the rospuda river valley –a record of depositional environments
    Autorzy:
    Pochocka-Szwarc, Katarzyna
    Krzyszkowski, Dariusz
    Powiązania:
    https://bibliotekanauki.pl/articles/2025811.pdf
    Data publikacji:
    2015
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    Rospuda River
    subglacial channel
    valley outwash plain
    lithofacies analysis
    ice-sheet limits
    Nauki o Ziemi
    Opis:
    The Rospuda subglacial chan nel hosts not only deep rib bon lakes and the Rospuda River it self, but also an outwash plain. The pa per deals with a lithofacies anal y sis of de pos its from ex po sures within the Rospuda outwash plain. With the sup port of geomorphological and geo log i cal anal y ses, it has been found that the outwash plain formed along the Rospuda subglacial chan nel that was be ing ex posed from un der the ice cover. The lithological re cord of the Rospuda outwash plain shows a dis tinct di vi sion into a prox i mal and a dis tal zone. The de pos its un der study re veal a re cord of a break in basial sed i men ta tion, when ice-wedge casts de vel oped un der con ditions of periglacial cli mate. The de vel op ment of the Rospuda outwash plain is linked with the ice-mar ginal zone of the Pom er a nian phase, sim i larly to the Olecko-Rajgród outwash plain that is lo cated to the west.
    Źródło:
    Studia Quaternaria; 2015, 32; 63-78
    1641-5558
    2300-0384
    Pojawia się w:
    Studia Quaternaria
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-4 z 4

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