نتایج جستجو برای: lower eocene

تعداد نتایج: 695634  

2018
Gabriela J Arreguín-Rodríguez Ellen Thomas Simon D'haenens Robert P Speijer Laia Alegret

The early Eocene greenhouse world was marked by multiple transient hyperthermal events. The most extreme was the Paleocene-Eocene Thermal Maximum (PETM, ~56 Ma), linked to the extinction of the globally recognised deep-sea benthic foraminiferal Velasco fauna, which led to the development of early Eocene assemblages. This turnover has been studied at high resolution, but faunal development into ...

2009
M. S. Abu El Ghar

The Eocene rocks in Shabraweet area comprise the Lower, Middle and Upper Eocene stages. Each stage consists of only one rock unit; the Minia Formation, the Mokattam Formation and the Maadi Formation, respectively. The Minia Formation shows angular unconformity relationship with the underlying Cretaceous rocks and disconformity relationship with the overlying Mokattam Formation. The Maadi Format...

2007
BENT E. K. LINDOW GARETH J. DYKE

A pair of fossilized imprints of feet represent the first published galliform (landfowl) specimen from the Lower Eocene Fur Formation of northwest Denmark. The specimen is referable to Galliformes due to the presence of a distinctly asymmetric trochlea metatarsi III. The specimen appears distinct from previously described Eocene Galliformes (e.g. Gallinuloididae, Quercymegapodiidae and Paraorty...

2016
Frauke Stebner Ryszard Szadziewski Bo Wang

Investigation of fossils in lower Eocene Fushun amber from China keeps proving to be of major importance for understanding Eocene Euro-Asian insect diversity and distribution. Three new species of predatory biting midges in the fossil genera Mantohelea and Gedanohelea are described. Mantohelea sinica n. sp., Gedanohelea fushunensis n. sp. and Gedanohelea liaoningensis n. sp. from Eocene Fushun ...

2007
Alessandro Zanazzi Matthew J. Kohn

To characterize the ecology and physiology of common late Eocene–early Oligocene White River mammals, we analyzed the carbon and oxygen isotope composition of tooth enamel carbonate for six of the most abundant taxa: the perissodactyls Brontops (brontothere), Mesohippus (equid) and Subhyracodon (rhino); and the artiodactyls Merycoidodon (oreodont), Leptomeryx (leptomerycid) and Poebrotherium (c...

Journal: Journal of Tethys 2017

In this study, the assemblage of calcareous nannofossils has been investigated in long and continuous deposits from a Kafaz section in Eastern Iran. A systematic study of calcareous nannofossils has indicated 39 nannofossils species. In order to the age determination of Kafaz's deposits, a revised zonation for the Eocene is used. Based on it, the Early-Middle Eocene deposits of Kafaz section is...

پایان نامه :وزارت علوم، تحقیقات و فناوری - دانشگاه علوم پایه دامغان - دانشکده علوم زمین 1390

در این پژوهش نهشته های پرمین تا میوسن حوضه زاگرس در چاه شماره 1 میدان نفتی هامون واقع در منطقه خلیج فارس بر اساس خرده های حفاری (cutting) از لحاظ چینه شناسی زیستی، سنگ شناسی و محیط رسوبی برخی سازند ها (مخصوصا سازند سورمه) مورد مطالعه قرار گرفته است. ضخامت سازند ها در این برش تحت الارضی مجموعا 2683 متر بوده و به سازند های دالان، کنگان، دشتک، نیریز، سورمه، هیث، فهلیان، گدوان، داریان، کژدمی، سروک،...

2005

Introduction.-Since the description' of a skull of Amynodontopsis bodei and of a lower jaw referred to this species from the uppermost Eocene, further dental parts have become available for study from localities in the Sespe. These furnish additional characters of value in recognizing the species represented in western Eocene deposits. Now also available is a fragment of skull with cheek-teeth ...

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