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Wyszukujesz frazę "Campanian/Maastrichtian boundary" wg kryterium: Temat

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    Wyświetlanie 1-8 z 8
    Tytuł:
    Cysty Dinoflagellata z górnego kampanu i najniższego mastrychtu (górna kreda) profilu środkowej Wisły - stratygrafia i paleoekologia
    Dinoflagellate cysts from the upper Campanian–lowermost Maastrichtian (Upper Cretaceous) of the Middle Vistula River section - stratigraphy and palaeoecology
    Autorzy:
    Nechwedowicz, Mariusz
    Powiązania:
    https://bibliotekanauki.pl/articles/20197905.pdf
    Data publikacji:
    2022
    Wydawca:
    Państwowy Instytut Geologiczny – Państwowy Instytut Badawczy
    Tematy:
    cysty bruzdnicowe
    taksonomia
    biostratygrafia
    paleoekologia
    zmiany poziomu morza
    chłodzenie
    Kampan
    Mastrycht
    górna kreda
    środkowaj Wisła
    Polska
    dinoflagellate cysts
    taxonomy
    biostratigraphy
    palaeoecology
    sea-level changes
    cooling
    Campanian/Maastrichtian boundary
    Upper Cretaceous
    Middle Vistula River section
    Polska
    Opis:
    Among the rich dinoflagellate cyst assemblages recovered from the upper Campanian-lowermost Maastrichtian succession of the Middle Vistula River section (central Poland), four taxa (Callaiosphaeridium bicoronatum, Odontochitina dilatata, Oligosphaeridium araneum and Samlandia paucitabulata) have been described as new. An analysis of the distribution of particular dinoflagellate cyst taxa enabled the development of a highly resolved biostratigraphic framework, calibrated against other biozonal schemes (based, among others, on inoceramid bivalves, ammonites and belemnites), formerly established for the succession. A comparison of the Middle Vistula River record with the dinoflagellate cyst ranges documented in other European successions enabled correlations with selected sections in Belgium, the Netherlands, southern Germany and northern Italy, and with the Campanian/Maastrichtian boundary stratotype section in Tercis les Bains, southwest France. A palaeoecological analysis of the dino- flagellate cyst assemblages and of other components of phytoplankton communities revealed a well-defined trend in sea-level fluctuations (likely of eustatic origin), and palaeoclimatic changes probably related to the latest Cretaceous cooling episode, as observed elsewhere.
    Źródło:
    Przegląd Geologiczny; 2022, 70, 10; 751-760
    0033-2151
    Pojawia się w:
    Przegląd Geologiczny
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Early representatives of the belemnite genus Belemnella (Cephalopoda) from the uppermost Campanian-Lower Maastrichtian of the Middle Vistula River section, central Poland
    Autorzy:
    Keutgen, N.
    Remin, Z.
    Walaszczyk, I.
    Powiązania:
    https://bibliotekanauki.pl/articles/139049.pdf
    Data publikacji:
    2012
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    Belemnella
    biostratygrafia
    Campanian-Maastrichtian boundary
    kampan
    mastrycht
    Wisła
    biostratigraphy
    Middle Vistula River section
    Species concepts
    Opis:
    Representatives of the belemnite genus Belemnella from the uppermost Campanian and lowermost Maastrichtian of the Middle Vistula River Valley section (central Poland) have been studied, using the species concept proposed by Schulz in 1979. Results have been compared to a recently proposed new interpretation of the genus Belemnella based on artificial neural networks, as put forward by Remin in 2007 and 2012. In the interval studied, four taxa have been recognised: Bln. longissima, Bln. inflata, Bln. obtusa and Bln. vistulensis, the last-named being a senior synonym of Bln. pseudobtusa. Three additional forms have been left in open nomenclature: Bln. cf. lanceolata, Bln. ex gr. lanceolata/inflata and Belemnella sp. Based on their documented vertical ranges, three Belemnella standard zones, as originally distinguished in the Kronsmoor section by Schulz (1979), northern Germany, have been defined, in ascending order: the Bln. lanceolata, Bln. vistulensis and Bln. obtusa zones. The bases of the lanceolata and obtusa zones in the Middle Vistula River Valley section can be directly correlated with the same zones at Kronsmoor, and appear to be isochronous within limits of stratigraphic resolution. The base of the vistulensis Zone (Bln. vistulensis according to the species concept of Schulz in 1979), however, is probably diachronous, being older in the Middle Vistula section. Although Schulz's and Remin's species concepts differ quite considerably, they do result in similar stratigraphic subdivisions of the Kronsmoor and Middle Vistula River sections.
    Źródło:
    Acta Geologica Polonica; 2012, 62, 4; 535-559
    0001-5709
    Pojawia się w:
    Acta Geologica Polonica
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Foraminiferal bioevents in the upper Campanian to lowest Maastrichtian of the Middle Vistula River section, Poland
    Autorzy:
    Peryt, D.
    Dubicka, Z.
    Powiązania:
    https://bibliotekanauki.pl/articles/2059982.pdf
    Data publikacji:
    2015
    Wydawca:
    Państwowy Instytut Geologiczny – Państwowy Instytut Badawczy
    Tematy:
    Campanian-Maastrichtian boundary
    foraminifera
    bioevents
    stratigraphic correlation
    Middle Vistula River Valley section
    Opis:
    The Upper Campanian–Lower Maastrichtian interval of the Middle Vistula River Valley section records the following benthic foraminiferal bioevents in ascending stratigraphical order: LO of Globorotalites michelinianus, FO and LO of Globorotalites emdyensis (=G. hiltermanni), FO of Bolivina incrassata, FO of Bolivinoides miliaris, FO of Angulogavelinella gracilis (=A. bettenstaedti), LO of Gavelinella monterelensis, FO of Osangularia navarroana, FO of Bolivina decurrens and FO of Neoflabellina reticulata. These events are recorded in very similar stratigraphic positions in the Lägerdorf-Kronsmoor succession (northern Germany) and in the succession of eastern England and, at least some of them, in eastern Europe. Accordingly they can serve as important markers for stratigraphic correlation across Europe. The FOs of the planktonic species, Rugoglobigerina milamensis, R. hexacamerata and R. pennyi, in the uppermost part of the “Inoceramus” redbirdensis Zone,are very close to the Campanian–Maastrichtian boundary as defined by inoceramid bivalves (Walaszczyk, 2004) and we propose these planktonic foraminiferal bioevents as a good proxy for this boundary in temperate regions.
    Źródło:
    Geological Quarterly; 2015, 59, 4; 814--830
    1641-7291
    Pojawia się w:
    Geological Quarterly
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Hexactinellid sponge assemblages across the Campanian.Maastrichtian boundary in the Middle Vistula River section, central Poland
    Autorzy:
    Świerczewska-Gładysz, E.
    Powiązania:
    https://bibliotekanauki.pl/articles/139147.pdf
    Data publikacji:
    2012
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    ekologia
    gąbki
    kampan
    kreda górna
    mastrycht
    Polska
    Campanian-Maastrichtian boundary
    ecology
    Hexactinosida
    Lychniscosida
    southern Poland
    sponges
    Upper Cretaceous
    Opis:
    The sponge fauna from the Upper Campanian.lowermost Maastrichtian succession of the Middle Vistula River valley (central Poland) is represented mainly by dictyid hexactinellid sponges (Hexactinosida and Lychniscosida). Their greatest abundance and taxonomic variability is noted in the "Inoceramus" inkermanensis Zone (Upper Campanian), and they are less diverse in the overlying (Upper Campanian) Trochoceramus costaecus Zone and lower "Inoceramus" redbirdensis Zone. In the upper "Inoceramus" redbirdensis Zone (basal Maastrichtian in the sense of the Tercis rather than the Boreal definition) they are extremely rare. With the beginning of the Maastrichtian the number of dictyid sponges gradually increases. The observed changes in the abundance and taxonomic variability of the dictyid sponges indicate environmental changes in the latest Campanian.earliest Maastrichtian sea in the area. It seems that changes in basin bathymetry, confined to eustatic sea-level changes in the latest Campanian and early Maastrichtian, were the most important factor. Progressive shallowing of the basin in the latest Campanian drastically restricted the development of dictyids. In the peak regression, the sea level could have fallen to only several tens of metres. The gradual recovery of the sponge assemblages correlates with subsequent deepening of the basin with the start of the Maastrichtian.
    Źródło:
    Acta Geologica Polonica; 2012, 62, 4; 561-580
    0001-5709
    Pojawia się w:
    Acta Geologica Polonica
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Integrated stratigraphy of the Campanian-Maastrichtian boundary succession of the Middle Vistula River (central Poland) section; introduction
    Autorzy:
    Walaszczyk, I.
    Powiązania:
    https://bibliotekanauki.pl/articles/139092.pdf
    Data publikacji:
    2012
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    biostratygrafia
    kampan
    korelacja
    mastrycht
    Polska
    Wisła
    biostratigraphy
    Campanian-Maastrichtian boundary
    Central Poland
    correlation
    Middle Vistula River section
    Opis:
    The Campanian-Maastrichtian boundary interval of the Middle Vistula River valley section (central Poland) represents a continuous, lithologically monotonous, fossiliferous succession, with a good stable isotope and palaeomagnetic signal. It yields all the biostratigraphically critical macro- and microfossil groups: ammonites, belemnites, inoceramid bivalves, foraminifera, nannofossils and dinoflagellates. Additionally, it is located in the transitional zone between the Boreal and Tethyan biogeographic provinces, as well as between the western and eastern biogeographic areas of Europe. The section supplements the data on the interval acquired recently from the basal Maastrichtian stratotypic section in Tercis, south-west France, and from the interval reference section in Kronsmoor, northern Germany.
    Źródło:
    Acta Geologica Polonica; 2012, 62, 4; 485-493
    0001-5709
    Pojawia się w:
    Acta Geologica Polonica
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Magnetostratigraphy of the Campanian/Maastrichtian boundary succession from the Middle Vistula River section, Central Poland
    Autorzy:
    Plasota, T.
    Nawrocki, J.
    Walaszczyk, I.
    Powiązania:
    https://bibliotekanauki.pl/articles/2059995.pdf
    Data publikacji:
    2015
    Wydawca:
    Państwowy Instytut Geologiczny – Państwowy Instytut Badawczy
    Tematy:
    magnetostratigraphy
    Campanian-Maastrichtian boundary
    Polska
    Opis:
    The magnetic polarities of the upper Upper Campanian–Lower Maastrichtian interval of the Middle Vistula River composite section (central Poland), were studied. Sixty-six hand-oriented samples for palaeomagnetic studies were taken from the sections of Raj, Raj North, Podole, Kłudzie and Dziurków. The inter-correlation between them is based primarily on bio-events. The sampled rocks generally revealed a very weak magnetic signal, however quite reliable results were obtained. The whole interval studied, well constrained biostratigraphically, is referred to magnetostratigraphic chron C32n. The Campanian–Maastrichtian boundary, placed biostratigraphically in the upper part of the ‘Inoceramus’ redbirdensis inoceramid Zone, is located near the top of the C32n2n Subchron. Thin reversed polarity intervals in the rocks correlated with the C32n2n chron most probably result from their partial remagnetization (maghemitization).
    Źródło:
    Geological Quarterly; 2015, 59, 4; 831--842
    1641-7291
    Pojawia się w:
    Geological Quarterly
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    The Belemnella stratigraphy of the Campanian-Maastrichtian boundary; a new methodological and taxonomic approach
    Autorzy:
    Remin, Z.
    Powiązania:
    https://bibliotekanauki.pl/articles/138983.pdf
    Data publikacji:
    2012
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    belemnity
    biostratygrafia
    kampan
    Kronsmoor
    mastrycht
    sztuczne sieci neuronowe
    Wisła
    Artificial Neural Networks
    belemnites
    biostratigraphy
    Campanian
    Campanian-Maastrichtian boundary
    Kronsmoor section
    Maastrichtian
    Vistula section
    Opis:
    The taxonomy and stratigraphy of the Upper Campanian and Lower Maastrichtian belemnites from the Vistula (central Poland) and Kronsmoor (northern Germany) sections are revised on the basis of new collections from the Vistula section as well as a reinvestigation of the classic collection of Schulz from the Kronsmoor section. For the taxonomic description a new biometric procedure is proposed, which can be applied to both the genera Belemnella and Belemnitella. For the species-level taxa recognition the Artificial Neural Networks method, the self-organizing Kohonen algorithm, was implemented. This new taxonomic and methodological approach enabled the recognition of nine species of the genus Belemnella. Five of them can be assigned to the existing species B. lanceolata, B. longissima, B. inflata, B. obtusa and B. vistulensis. However, the species concept differs from that applied by Schulz (1979). As a consequence, the stratigraphic ranges of these species are modified. Four species are left in open nomenclature and represent possibly new species. Future studies may reveal that they might be assigned to East European forms from Ukraine or Russia. The species of Belemnella recognized are placed into the stratigraphic framework based on the standard ammonite and inoceramid bivalve zonations, especially those recognized in the Vistula section. The newly proposed belemnite zonation for the Vistula and Kronsmoor sections is correlated via inoceramids with the standard GSSP at Tercis, France, in order to identify the base of the Maastrichtian Stage. The Campanian/Maastrichtian boundary as defined in Tercis is placed here at the base of the newly defined B. obtusa and B. vistulensis Zones ["obtusa/vistulensis"] - thus it is markedly higher than the traditional boundary based on the FAD of representatives of the genus Belemnella - This new boundary coincides well with a distinct turnover of belemnite guard morphology and represents one of the most important points in the early evolutionary history of Belemnella. Three belemnite zones defined by their lower boundaries are recognized in the Campanian/Maastrichtian interval, in addition to three subzones recognized within the B. obtusa Superzone. The B. lanceolata and B. inflata zones as understood here are referred to the Upper Campanian [Tercis definition]. The B. obtusa Zone is subdivided into three subzones, viz.: Belemenlla vistulensis, Belemnella sp. G and Belemnella sp. F, which are referred to the Lower Maastrichtian [Tercis definition]. The fast evolving species of Belemnella enable the proposal of a biostratigraphic scheme with a resolution that is higher than those based on inoceramid bivalves and ammonites - the longevity of a belemnite zone could be as low as 200Ky.
    Źródło:
    Acta Geologica Polonica; 2012, 62, 4; 495-533
    0001-5709
    Pojawia się w:
    Acta Geologica Polonica
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    The Belemnitella stratigraphy of the Upper Campanian : basal Maastrichtian of the Middle Vistula section, central Poland
    Autorzy:
    Remin, Z.
    Powiązania:
    https://bibliotekanauki.pl/articles/2059997.pdf
    Data publikacji:
    2015
    Wydawca:
    Państwowy Instytut Geologiczny – Państwowy Instytut Badawczy
    Tematy:
    Campanian
    Maastrichtian
    Vistula section
    belemnites
    biostratigraphy
    artificial Neural Networks
    Campanian-Maastrichtian boundary
    Opis:
    This taxonomy and stratigraphy of the Upper Campanian and Lower Maastrichtian Belemnitella lineages, from the Middle Vistula sections, based on new collections, is presented. The correlation to the basal Maastrichtian standard GSSP at Tercis, France, is provided based on inoceramid bivalve stratigraphy. The Artificial Neural Networks (ANN), particularly the self-organizing Kohonen algorithm, was applied to taxonomic discrimination. Eight morphotypes within the genus Belemnitella, understood here as natural species populations, were recognised. Five of these are assigned to known taxa: Belemnitella mucronata, B. posterior, B. minor [= B. minor I and B. minor II], B. langei and B. najdini; and three, B. sp. a, B. sp. 1 and B. sp. 2, are left in open nomenclature. Four Belemnitella zones are proposed. Due to its palaeogeographic position, between Western and Eastern Europe, the Middle Vistula section is characterized by the co-occurrence of Belemnitella species from those two areas. Consequently, it enables better correlation of Belemnitella-based schemes; the East European B. najdini and B. posterior are placed next to West European B. minor chronospecies I and II. The Campanian/Maastrichtian boundary, as currently defined, is placed at the top of the najdini – posterior Zone, which is an equivalent of the Belemnella-based boundary, i.e. at the base of the Belemnella obtusa / Belemnella vistulensis zones. Within the top of the najdini – posterior Zone occurs a level (an interval of only a few metres), where nearly all of the Upper Campanian Belemnitella disappear. This level coincides with taxonomic changes observed within the co-occurring representatives of genus Belemnella.
    Źródło:
    Geological Quarterly; 2015, 59, 4; 783--813
    1641-7291
    Pojawia się w:
    Geological Quarterly
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-8 z 8

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