نتایج جستجو برای: berriasian valanginian
تعداد نتایج: 197 فیلتر نتایج به سال:
The first occurrence of the belemnite species Liobelus acrei (formerly Acroteuthis acrei) is reported from Lower Cretaceous (Valanginian) Vocontian Basin (VB; south-east France). This record genus (Family Cylindroteuthididae), which commonly attributed to latest Jurassic and Early Boreal Realm, revises spatial distribution pattern boreal belemnites significantly. Valanginian assemblages VB are ...
Fossil-wood carbon-isotope data are presented for the Wessex Formation, a non-marine unit within the Lower Cretaceous (Valanginian–Barremian) Wealden Group of the Isle of Wight and Dorset, southern England. The carbon-isotope values have a range ( C c. 26.6 to 19.8‰) that is consistent with that expected for Mesozoic C3 plants. Consideration of the Isle of Wight fossil-wood carbon-isotope data ...
We revisit a small but extremely significant collection of bird and pterosaur bones from the Lower Cretaceous (Berriasian) of western Romania. These fossils were collected in the late 1970s and early 1980s from a Lower Cretaceous (Berriasian) conglomerate lens deep in a bauxite mine at Cornet, close to the city of Oradea, Romania, and they caused a sensation when first described. Some fossils w...
High-amplitude changes in sedimentary δ 13 C characterize the Cretaceous system and have been proven useful for supra-regional chemostratigraphic correlation. In Cretaceous, these perturbations indicate large shifts between global carbon reservoirs that are usually caused by volcanic activity of igneous provinces, widespread deposition thick organic carbon-rich sequences and/or orbital paramete...
Abstract The structure and tectonic evolution of the Cretaceous rift basins southern Egypt are poorly understood. In this study, tectonostratigraphy Komombo Basin has been determined using seismic, well biostratigraphic data. basin is compared to Kharit, Nuqra Beni Suef in as Muglad Sudan. a 58 km long, 28 wide NW–SE trending half‐graben infilled with 2200 m Berriasian‐Maastrichtian sediments o...
Jurassic and Lower Cretaceous successions of the Manin Unit Central Western Carpathians are exposed in Butkov Quarry Middle Vah Region, Slovakia. A significant part macrofauna belonging to neocomitid ammonites, formerly classified under genus Teschenites Thieuloy, 1971, occurs deposits spanning Valanginian/Hauterivian boundary. The original definition was accompanied by uncertainties taxonomic ...
A Valanginian to Barremian bathyal foraminiferal assemblage (118 taxa belonging to 51 genera) is documented from ODP Site 766, drilled near the foot of the Exmouth Plateau off northwest Australia. The majority of taxa are cosmopolitan species previously described from the boreal assemblages of northern Europe and the northern margins of the Tethys, but 32 taxa could not be assigned to previousl...
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