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Volumina Jurassica
EN At the Triassic/Jurassic (T/J) boundary one of the most important mass extinctions occurred. The inferred causes for this extinction are numerous: eustatic variations; climatic changes; extraterrestrial impact events; strong volcanic episodes etc. One of the diagnostic evidences of a bolide impact i[...]
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Volumina Jurassica
EN The composition and diversity of Late Rhaetian/Hettangian microfloras of the NW Tethyan realm are investigated with respect to the Triassic/Jurassic mass extinction and the processes that may have caused this crisis. Key locations for detailed palynological studies are selected in the Tatra Mountain[...]
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Volumina Jurassica
EN An apparently global pattern of carbon-isotope change in carbonates and organic matter across the T/J boundary has increasingly been recognized from marine sections, and may be useful as a basis for correlation. Evidence from other geological events indicates that this isotopic pattern should also h[...]
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Volumina Jurassica
EN The studied Csövár section is situated NE of Budapest (Hungary) and exposes a continuous, marine Triassic/Jurassic boundary section of slope to basinal facies. Late Triassic palaeogeographic reconstructions indicate that this area was located close to the offshore margin of the Dachstein carbonate p[...]
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Volumina Jurassica
EN The criterion for definition of the Triassic/Jurassic boundary (TJB) should be a marker event of optimal global correlateability. Only an ammonite event meets this criterion; other potential marker events for definition of the TJB have less correlation potential. Since the 1960s, the LO of the ammon[...]
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Volumina Jurassica
EN The most significant geodynamic process in the Southeastern Asia was convergent Late Triassic event which was the continuation of Indosinian Orogeny and induced consolidation of Chinese blocks. Also, Indochina and Indonesia were sutured to South China, and Qiangtang block approached the Eurasian mar[...]
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Volumina Jurassica
EN Using an integrated stratigraphic approach, the Triassic/Jurassic (T/J) boundary has been studied in two different tectonostratigraphic units and three contrasting facies types in Hungary. In the northeasternmost part of the Transdanubian Range unit (part of the Alcapa terrane), the Csövár section h[...]
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Volumina Jurassica
EN The northwestern part of the Northern Calcareous Alps (NCA) is famous for its fully marine and complete Triassic/Jurassic transition beds formed in an intraplatform through of the western Tethys called as Eiberg Basin (Krystyn et al. 2005). A classic boundary section (Kendlbachgraben) with a relativ[...]
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Volumina Jurassica
EN Providing accurate and precise radio-isotopic ages for the Triassic/Jurassic (T/J) boundary is a goal for time scale calibration but it also bears on the timing and causality of the end-Triassic mass extinction and subsequent recovery. The currently used estimate of the T/J boundary age hinges on a [...]
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Volumina Jurassica
EN The extinction that marks the Triassic/Jurassic boundary (T/J boundary) is one of the so-called "big five" that punctuate the Phanerozoic. Two sequences spanning the boundary occur in the Queen Charlotte Islands (QCI) of British Columbia; one is located at Kennecott Point on Graham Island (section I[...]
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Volumina Jurassica
EN Oxygen and carbon isotope values have been obtained from oysters for the Triassic/Jurassic boundary section at Lavernock Point (Wales), and from brachiopods and oysters for different Hettangian, Sinemurian and Pliensbachian localities of South Germany and Hungary. Low-Mg-calcite brachiopods and oyst[...]
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Volumina Jurassica
EN The basal Fernie Formation at Black Bear Ridge consists of 22 m of concretionary, brown weathering siltstones containing abundant ammonites which prove the presence of lower, middle, and upper Hettangian strata. Based on over 300 specimens we have recognized 13 ammonite horizons which may be grouped[...]
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Acta Geologica Polonica
EN Sedimentological, palynological, clay mineralogical and carbon isotope studies were carried out on the Triassic/Jurassic (T/J) boundary interval in the NW Tethyan Realm. The analyses are based on two sections in the Slovakian Tatra Mountains (Western Carpathians): the Siroky Zl'ab section in the Med[...]
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