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    Tytuł:
    Ammonite faunal dynamics across bio-events during the mid- and Late Cretaceous along the Russian Pacific coast
    Autorzy:
    Jagt-Yazykova, E.A.
    Powiązania:
    https://bibliotekanauki.pl/articles/22657.pdf
    Data publikacji:
    2012
    Wydawca:
    Polska Akademia Nauk. Instytut Paleobiologii PAN
    Tematy:
    ammonite
    fauna dynamics
    Late Cretaceous
    Cretaceous
    Russian coast
    Pacific coast
    Ammonoidea
    evolution
    Opis:
    The present paper focuses on the evolutionary dynamics of ammonites from sections along the Russian Pacific coast during the midand Late Cretaceous. Changes in ammonite diversity (i.e., disappearance [extinction or emigration], appearance [origination or immigration], and total number of species present) constitute the basis for the identification of the main bio−events. The regional diversity curve reflects all global mass extinctions, faunal turnovers, and radiations. In the case of the Pacific coastal regions, such bio−events (which are comparatively easily recognised and have been described in detail), rather than first or last appearance datums of index species, should be used for global correlation. This is because of the high degree of endemism and provinciality of Cretaceous macrofaunas from the Pacific region in general and of ammonites in particular.
    Źródło:
    Acta Palaeontologica Polonica; 2012, 57, 4
    0567-7920
    Pojawia się w:
    Acta Palaeontologica Polonica
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Molluscs from the Early Frasnian goniatite level at Kostomloty in the Holy Cross Mountains, Poland
    Autorzy:
    Jagt-Yazykova, E
    Krawczynski, W.
    Rakocinski, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/20723.pdf
    Data publikacji:
    2006
    Wydawca:
    Polska Akademia Nauk. Instytut Paleobiologii PAN
    Tematy:
    paleontology
    mollusc
    Early Frasnian
    Frasnian
    goniatite level
    Kostomloty commune
    Holy Cross Mountains
    Polska
    Devonian
    Goniatitida
    Nautiloida
    Gastropoda
    Bivalvia
    paleoecology
    Acanthoclymenia
    Linguatornoceras
    Koenenites
    new species
    Palaeozygopleura pyritica
    bivalve
    Glyptohallicardia multicostata
    Opis:
    The unique goniatite−rich pyritic level, 1.6 m thick, exposed at Kostomłoty (Holy Cross Mountains, central Poland) represents a distinct, local biotic event in the Early Frasnian interval corresponding to the inception of a major geochemical (carbon cycling) perturbation in the stagnant deep−water and oxygen−deficient Kostomłoty basin. The taxonomic and palaeoecologic characteristics of molluscan fossil associations from the Goniatite Level are presented. Most of the goniatitids and orthoconic nautiloids from the studied fossil assemblages are juvenile conchs or protoconchs, or incomplete phragmocones and represent the genera Acanthoclymenia and Linguatornoceras, the former being predominant, and a single adult specimen probably of the genus Koenenites. In contrast, gastropods and bivalves are generally well preserved and identifiable to species level. Two new species are described: a gastropod Palaeozygopleura (Bohemozyga) pyritica sp. nov. and a bivalve Glyptohallicardia multicostata sp. nov. These studied molluscs and also amphiporoids are allochthonous elements which must have been transported into the deeper settings during sea−level rise and flooding of fringing reefs (Timan Event) and/or storm events, and there were mixed with pelagic cephalopods. Probably, a sea−level rise even led to flooding of nearby areas, and thus to introduction of pelagic material (juvenile cephalopods) into reefal settings, and then back to the deeper water again by the quasi−estuarine circulation of water masses.
    Źródło:
    Acta Palaeontologica Polonica; 2006, 51, 4; 707-718
    0567-7920
    Pojawia się w:
    Acta Palaeontologica Polonica
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Thirty odd years after Alvarez’s discovery: Faunal evolution and principal bio-events of the Cretaceous Period - recent progress and future directions
    Autorzy:
    Jagt-Yazykova, E.A.
    Jagt, J.W.M.
    Powiązania:
    https://bibliotekanauki.pl/articles/21601.pdf
    Data publikacji:
    2012
    Wydawca:
    Polska Akademia Nauk. Instytut Paleobiologii PAN
    Tematy:
    Alvarez’s discovery
    fauna evolution
    Cretaceous
    progress
    future direction
    paleontology
    Źródło:
    Acta Palaeontologica Polonica; 2012, 57, 4
    0567-7920
    Pojawia się w:
    Acta Palaeontologica Polonica
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Terminal Maastrichtian ammonites from Turkmenistan, Central Asia
    Autorzy:
    Machalski, M.
    Jagt, J.W.M.
    Alekseev, A.S.
    Jagt-Yazykova, E.A.
    Powiązania:
    https://bibliotekanauki.pl/articles/20971.pdf
    Data publikacji:
    2012
    Wydawca:
    Polska Akademia Nauk. Instytut Paleobiologii PAN
    Tematy:
    paleontology
    Maastrichtian
    ammonite
    Turkmenistan
    Central Asia
    Ammonoidea
    extinction
    paleobiogeography
    Cretaceous
    Paleogene
    Opis:
    A complete uppermost Maastrichtian–Danian succession in the Sumbar River section, western Kopet Dagh (southwest Turkmenistan, Central Asia), constitutes one of the few instances in the world where the fossil record of the last ammonites can be directly positioned with respect to the iridium−rich, impact−related clay layer, which defines the Cretaceous–Paleogene (K–Pg) boundary. Two ammonite taxa, Baculites cf. vertebralis and Hoploscaphites constrictus johnjagti, range up to a level directly beneath the K–Pg boundary clay in the Sumbar River section. Thus, these two forms probably survived until the very end of the Maastrichtian in the western Kopet Dagh area. The terminal Maastrichtian ammonite records from the Sumbar River area represent the southeasternmost occurrences of these essentially Boreal taxa.
    Źródło:
    Acta Palaeontologica Polonica; 2012, 57, 4
    0567-7920
    Pojawia się w:
    Acta Palaeontologica Polonica
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-5 z 5

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