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    Wyświetlanie 1-4 z 4
    Tytuł:
    Sedimentological and palaeoecological significance of the trace fossils of the Jurassic rocks of the Jhura Dome, Mainland Kachchh, western India
    Autorzy:
    Patel, S. J.
    Patel, N. J.
    Powiązania:
    https://bibliotekanauki.pl/articles/2077327.pdf
    Data publikacji:
    2015
    Wydawca:
    Państwowy Instytut Geologiczny – Państwowy Instytut Badawczy
    Tematy:
    Jurassic
    ichnoassemblages
    ichnoguilds
    ichnofacies
    depositional environment
    Kachchh
    India
    jura
    skamieniałość śladowa
    Indie
    Opis:
    The Middle to Late Jurassic succession of the Jhura Dome (Jhurio and Jumara formations) of the Mainland Kachchh, western India, comprises a ~500 m thick succession of clastic carbonates and mixed siliciclastic-carbonates, intercalated with shales. The sequence, as based on sedimentological characteristics, exhibits six sedimentary facies and four subfacies. Certain exceptional bands of the ripplemarked calcareous sandstone, shale and oolitic limestone facies are rich in ammonites, belemnites, brachiopods and bivalves. Thirty four ichnogenera were also identified and analysed paleoecologically. These trace fossils represent five ethological categories and six ichnoassemblages. Seventeen ichnoguilds are demonstrated based on space utilization for characterising the ecological complexity of ichnoassemblages. Bathymetric control of the trace fossils resulted with development of Skolithos, Cruziana and Zoophycos ichnofacies type conditions. The sedimentological and ichnological data analysis revealed seven distinctive depositional regimes ranging from offshore shelf below storm wave base to middle shoreface.
    Źródło:
    Volumina Jurassica; 2015, 13, 2; 101--139
    1896-7876
    1731-3708
    Pojawia się w:
    Volumina Jurassica
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Early Cambrian trace fossils at the northern margin of the Arabian Plate; Telbesmi Formation, Turkey
    Autorzy:
    Demírcan, H.
    Gürsu, S.
    Göncüoğlu, M. C.
    Powiązania:
    https://bibliotekanauki.pl/articles/138729.pdf
    Data publikacji:
    2018
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    ichnofossils
    Telbesmi Formation
    Early Cambrian
    Derik (SE Turkey)
    skamieniałość śladowa
    formacja
    wczesny kambr
    Turcja
    Opis:
    The Telbesmi Formation, at the northern margin of the Arabian Plate, Turkey, is composed of alternating darkbrown, pinky-brown fluvial arkosic sandstone/mudstones with thin-bedded cherty limestones and channel conglomerates. The formation contains rare and poorly diversified trace fossils. The siltstone/sandstone beds of levels 1 and 2 of the formation yielded, however, a moderately diverse assemblage composed of: Cochlichnus isp., Palaeophycus isp., Planolites beverleyensis, Teichichnus isp. and ?Treptichnus rectangularis. This assemblage, made up of traces left by deposit feeding organisms, represents the Scoyenia ichnofacies. Treptichnus rectangularis and Palaeophycus isp., of the assemblage, can be considered markers for the base of the Cambrian in southeast Turkey.
    Źródło:
    Acta Geologica Polonica; 2018, 68, 2; 135-145
    0001-5709
    Pojawia się w:
    Acta Geologica Polonica
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Stanowisko z tropami kręgowców z osadów najwyższego środkowego pstrego piaskowca Gór Świętokrzyskich
    Vertebrate track site in the uppermost Middle Buntsandstein of the Holy Cross Mountains, Poland
    Autorzy:
    Kuleta, M.
    Niedźwiedzki, G.
    Zbroja, S.
    Powiązania:
    https://bibliotekanauki.pl/articles/2074480.pdf
    Data publikacji:
    2006
    Wydawca:
    Państwowy Instytut Geologiczny – Państwowy Instytut Badawczy
    Tematy:
    skamieniałość śladowa
    tropy kręgowców
    ślad kręgowców
    Góry Świętokrzyskie
    vertebrate tracks
    Middle Buntsandstein
    Triassic
    Holy Cross Mountains
    Polska
    Opis:
    TheMiddle Buntsandstein material of vertebrate tracks has been found at new site in the northern margin of the Holy Cross Mountains (central Poland). Several dozen specimens of Chirotheriidae (Chirotherium cf. barthii, cf. Brachychirotherium sp., Isochirotherium sp., and Chirotheriidae indet.) and Rhynchosauroidae (Rhynchosauroides sp., Rhynchosauroidae indet.) tracks are reported from the deposits of the Samsonów Formation (=Pseudooolithic Beds) at the Pałęgi clay pit located near Mniów. Poorly preserved cf. Capitosauroides sp. and numerous swimming animal traces were also found in this site. Those are the first finds of vertebrate tracks from the uppermost Middle Buntsandstein strata in the Holy Cross Mountains.
    Źródło:
    Przegląd Geologiczny; 2006, 54, 12; 1081-1088
    0033-2151
    Pojawia się w:
    Przegląd Geologiczny
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Sedimentology and ichnology of Neogene Coastal Swamp deposits in the Niger Delta Basin, Nigeria
    Autorzy:
    Ezeh, S. C.
    Mode, W. A.
    Ozumba, B. M.
    Yelwa, N. A.
    Powiązania:
    https://bibliotekanauki.pl/articles/94317.pdf
    Data publikacji:
    2016
    Wydawca:
    Uniwersytet im. Adama Mickiewicza w Poznaniu
    Tematy:
    ichnofosylium
    sandstones
    heteroliths
    ichnofossil
    cores
    depositional environment
    Miocene
    piaskowce
    heterolity
    skamieniałość śladowa
    rdzenie
    środowisko sedymentacji
    miocen
    Opis:
    Often analyses of depositional environments from sparse data result in poor interpretation, especially in multipartite depositional settings such as the Niger Delta. For instance, differentiating channel sandstones, heteroliths and mudstones within proximal environments from those of distal facies is difficult if interpretations rely solely on well log signatures. Therefore, in order to achieve an effective and efficient interpretation of the depositional conditions of a given unit, integrated tools must be applied such as matching core descriptions with wireline log signature. In the present paper cores of three wells from the Coastal Swamp depositional belt of the Niger Delta are examined in order to achieve full understanding of the depositional environments. The well sections comprise cross-bedded sandstones, heteroliths (coastal and lower shoreface) and mudstones that were laid down in wave, river and tidal processes. Interpretations were made from each data set comprising gamma ray logs, described sedimentological cores showing sedimentary features and ichnological characteristics; these were integrated to define the depositional settings. Some portions from one of the well sections reveal a blocky gamma ray well log signature instead of a coarsening-upward trend that characterises a shoreface setting while in other wells the signatures for heteroliths at some sections are bell blocky in shaped rather than serrated. Besides, heteroliths and mudstones within the proximal facies and those of distal facies were difficult to distinguish solely on well log signatures. However, interpretation based on sedimentology and ichnology of cores from these facies was used to correct these inconsistencies. It follows that depositional environment interpretation (especially in multifarious depositional environments such as the Niger Delta) should ideally be made together with other raw data for accuracy and those based solely on well log signatures should be treated with caution.
    Źródło:
    Geologos; 2016, 22, 3; 191-200
    1426-8981
    2080-6574
    Pojawia się w:
    Geologos
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-4 z 4

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