نتایج جستجو برای: late campanian
تعداد نتایج: 195767 فیلتر نتایج به سال:
Abstract The mid-Cretaceous thermal maximum (KTM) during Cenomanian to Santonian times from ca. 100 83 Ma is considered among Earth's warmest sustained intervals of the Phanerozoic. time interval also characterized by major paleoceanographic changes in form an oceanic anoxic event and flooding epicontinental seaways, such as Western Interior Seaway North America. We report carbonate clumped iso...
Abstract. Central and western Europe were affected by a compressional tectonic event in the Late Cretaceous, caused convergence of Iberia Europe. Basement uplifts, inverted graben structures, newly formed marginal troughs are main expressions crustal shortening. Although maximum activity occurred during short period time between 90 75 Ma, exact timing this is still unclear. Dating start end Cre...
Abstract Late Cretaceous felsic and latest Cretaceous-Paleogene basaltic volcanic rocks are exposed throughout the Kyrenia Range, N Cyprus. Field mapping of key, well-exposed western range indicates that volcanics mainly crop out in southerly, frontal part range, separated from farther north by a thrust. New U-Pb zircon dating primary age c. 74.0?Ma (Late Campanian). The characterised evolved c...
The mesoeucrocodylian record from the Bauru Group (Paraná Basin, Brazil) comes three formations: Adamantina (Late Turonian–Early Maastrichtian), Presidente Prudente (Early Campanian–Early Maastrichtian) and Marília (Maastrichtian). These records are restricted to Early Coniacian–Early Maastrichtian. Here, we report a new crocodyliform Group, which was first of Araçatuba Formation, locality Coro...
Beautifully preserved, nearly complete theropod skeletons from Alberta (Canada) allow re−evaluation of the taxonomic status of North American tyrannosaurids. It is concluded that the most parsimonious interpretation of relationships leads to the separation of the two species of Albertosaurus (sensu Russell 1970) into Gorgosaurus libratus from the Campanian Dinosaur Park Formation and Albertosau...
A densely sampled, diverse new fauna from the uppermost Cedar Mountain Formation, Utah, indicates that the basic pattern of faunal composition for the Late Cretaceous of North America was already established by the Albian-Cenomanian boundary. Multiple, concordant 40Ar/39Ar determinations from a volcanic ash associated with the fauna have an average age of 98.39 +/- 0.07 million years. The fauna...
The Upper Cretaceous strata were studied in a composite stratigraphic section named here Padeha-Baghak section in east of Koppeh-Dagh basin, north east of Iran. In this study, palynostratigraphy, palynofacies and depositional environment history of Abderaz Formation were integrated with sequence stratigraphy. Determination of sea level history and sequence units of the Abderaz Formation using s...
The lower Calore and middle Volturno valleys preserve stratigraphical morphological evidence tephrostratigraphic markers particularly suitable for reconstructing the long-term geomorphological evolution of central-southern Apennines. Aim our study is to identify main steps Quaternary landscape these valley systems improve knowledge about relationships between fluvial processes tectonics, volcan...
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