نتایج جستجو برای: biozones v
تعداد نتایج: 303632 فیلتر نتایج به سال:
The Miocene mega-wetland of western Amazonia holds a diverse, largely endemic ostracod fauna. Among them, especially the genus Cyprideis experienced a remarkable radiation. Micropalaeontologic investigations of a 400 m long sediment core (~62 km SW Benjamin Constant, Amazonia, Brazil) permitted a taxonomic revision of about two-thirds of hitherto described Cyprideis species. We evaluate the dia...
Cenozoic sediments of the Taatsiin Gol and TaatsiinTsagaan Nuur area are rich in fossils that provide unique evidence of mammal evolution in Mongolia. The strata are intercalated with basalt flows. 40Ar/39Ar data of the basalts frame the time of sediment deposition and mammal evolution and enable a composite age chronology for the studied area. We investigated 20 geological sections and 6 fossi...
The recently collected fauna of Armantes 1A in Chron C5Br of the Armantes section necessitates reinterpretation of the previous bioand magnetostratigraphical correlations between the Armantes and Vargas sections (Calatayud–Daroca Basin, Central Spain) [W. Krijgsman, M. Garcés, C.G. Langereis, R. Daams, J. van Dam, A.J. van der Meulen, J. Agustı́, L. Cabrera, A new chronology for the Middle to La...
The Steptoean Positive Isotopic Carbon Excursion (SPICE) is a prominent +4–5‰ shift in the Cambrian δ13C record used for global chronostratigraphic correlation. onset of this excursion traditionally placed at base Pterocephaliid trilobite biomere (base Furongian Series). Recent studies have documented local controls on expression SPICE and emphasize need standards these complex biogeochemical s...
The Changhsingian (Late Permian) Hambast Formation of sections at Baghuk Mountain (Central Iran) has yielded diverse ammonoid assemblages composed the genera Pseudogastrioceras, Shevyrevites, Arasella, Dzhulfites, Paratirolites, Clivotirolites gen. nov., Esfahanites Alibashites, Lutites Abichites and Stoyanowites. succession species allows for a subdivision rock unit into biozones, which largel...
In this series a pictorial quiz pertaining to identification of normal anatomical structures and landmarks at a given level on the computed tomography (CT) is presented. An image depicting normal anatomy is followed by a series of images showing different pathologies. Readers are expected to identify and appreciate variation and changes in the normal anatomy in presence of a given pathology. Th...
در این پایان نامه v-فضای تصویری را که تعمیم خاصی از فضاهای تصویری می باشد را معرفی می کنیم. لازم به ذکر است که ابرفضای تصویری تعمیم معمول فضای تصویری در ابرهندسه می باشد با این حال در تعریف این ابرفضا متغیر های فرد نقش اساسی ندارند. به منظور رفع این مشکل v-فضاهای تصویری معرفی شده اند. نشان داده می شود این ابرفضاها ابزار مفیدی برای تعمیم مفهوم کلاس های چرن در ابرهندسه فراهم می...
Cognition of technical systems, as the ability to perceive situations, to learn about favorable behavior, and to autonomously generate decisions, adds new attributes to safety issues. The system can cope with heavily changing conditions but its future behavior is not known a-priori. Therefore, present software solutions to safety like a comprehensive analysis of the specification and its implem...
Well-preserved miospore assemblages are recorded from the Late Ordovician (Katian-Hirnantian), Ghelli Formation in Pelmis-gorge at the north-eastern Alborz Mountain The palynomorphs were extracted from siliciclastic deposits which are well-dated by using of marine palynomorphs (acritarchs and chitinozoans). The encountered miospore assemblages consist of 14 genera (28 species: 26 cryptospores a...
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