نتایج جستجو برای: late maastrichtian

تعداد نتایج: 195833  

Journal: :Iraqi geological journal 2023

On the basis of stratigraphic ranges reported calcareous nannfossils for several species, two sections Shiranish Formation from Hiran in Erbil Governorate and Smaqoli area Sulaimaniya Governorate, Northern Iraq, are analyzed. Four biozones visible examined region, grouped as follows oldest to youngest: Uniplanarius gothicus Interval zone; Tranolithus phacelosus Rienhardtites lives Micula murus ...

Journal: :Geologie En Mijnbouw 2022

Abstract The mid-Maastrichtian carbon isotope event (MME), dated at ∼69 Ma, reflects a perturbation of the global cycle that, in part, correlates with enigmatic extinction ‘true’ (i.e., non-tegulated) inoceramid bivalves. mechanisms this are still debated. While both extirpation and MME have been recorded variety deep-sea sites, little is known about their expression epicontinental chalk seas. ...

Journal: :European journal of environment and earth sciences 2022

The Maastrichtian–Eocene sediments (mainly shales and limestones) penetrated by the Itori borehole Ilaro boreholes in Dahomey Basin were investigated for foraminiferal biostratigraphy palaeoecological interpretation. These Araromi, Ewekoro, Oshosun formations at varying depths. Selected shale subjected to analysis many planktonic benthic species of foraminifera (agglutinated calcareous) recover...

ژورنال: علوم زمین 2013
سعیده سنماری, شهره حسن‌پور

نانو فسیل‌های آهکی ابزاری بسیار مناسب برای تقسیمات زیست‌چینه‌ای به‌ویژه در کرتاسه پسین به شمار می‌آیند. بدین سبب و به علت نبود مطالعات دقیق فسیل‌شناسی در منطقه، نانوپلانکتون‌های آهکی در برش جنوب باختر سروستان (سازندهای ایلام و گورپی) مورد مطالعه قرار گرفت. سنگ‌شناسی این سازندها شامل سنگ‌های رسوبی مارن، آهک رسی و شیل است. بر مبنای مطالعات انجام شده 14 خانواده، 22جنس و 39 گونه از نانوفسیل‌های آهک...

2006
CHARLIE J. UNDERWOOD SIMON F. MITCHELL

Three teeth of the shark Serratolamna serrata (Agassiz) from the Guinea Corn Formation (Central Inlier) represent the first recorded occurrence of fossil sharks from Cretaceous rocks of Jamaica. This occurrence increases the known palaeogeographical distribution of S. serrata, which appears to have been global. This species is largely known from the Upper Maastrichtian, which helps confirm the ...

Journal: :Proceedings of the National Academy of Sciences of the United States of America 2010
Zoltán Csiki Mátyás Vremir Stephen L Brusatte Mark A Norell

Islands are noted for the occurrence of aberrant, endemic, and dwarfed taxa (the "island effect"). Late Cretaceous vertebrate assemblages of Romania and elsewhere in Europe are classic examples of island faunas in the fossil record, and are characterized by dwarfed herbivorous dinosaurs and other endemic taxa that are noticeably primitive relative to their mainland contemporaries. Fossils of th...

Journal: :Journal of South American Earth Sciences 2021

Abelisaurid theropods are well known in Cretaceous beds along South America, particularly Patagonia. However, the record of latest abelisauroids is still far from satisfactory. Until recently, few taxa were described Maastrichtian beds: Carnotaurus sastrei and Quilmesaurus curriei, but also perhaps Abelisaurus comahuensis. In this contribution, we describe a new genus species (Niebla antiqua ge...

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