نتایج جستجو برای: paleocene

تعداد نتایج: 1189  

2015
Thomas E. Williamson Stephen L. Brusatte Ross Secord Sarah Shelley

Multituberculates were amongst the most abundant and taxonomically diverse mammals of the late Mesozoic and the Paleocene, reaching their zenith in diversity and body size in the Paleocene. Taeniolabidoidea, the topic of this paper, includes the largest known multituberculates, which possess highly complex cheek teeth adapted for herbivory. A new specimen from the early Paleocene (middle Puerca...

2006
Ellen Thomas

Upper abyssal to lower bathyal benthic foraminifers from ODP Sites 689 (present water depth 2080 m) and 690 (present water depth 2941 m) on Maud Rise (eastern Weddell Sea, Antarctica) are reliable indicators of Maestrichtian through Neogene changes in the deep-water characteristics at high southern latitudes. Benthic foraminiferal faunas were divided into eight assemblages, with periods of faun...

2014
Thierry Smith Florence Quesnel Gaël De Plöeg Dario De Franceschi Grégoire Métais Eric De Bast Floréal Solé Annelise Folie Anaïs Boura Julien Claude Christian Dupuis Cyril Gagnaison Alina Iakovleva Jeremy Martin François Maubert Judicaël Prieur Emile Roche Jean-Yves Storme Romain Thomas Haiyan Tong Johan Yans Eric Buffetaut

The Paleocene-Eocene Thermal Maximum (PETM) is correlated with the first occurrences of earliest modern mammals in the Northern Hemisphere. The latest Paleocene Clarkforkian North American Land Mammal Age, that has yielded rodents and carnivorans, is the only exception to this rule. However, until now no pre-PETM localities have yielded modern mammals in Europe or Asia. We report the first Clar...

Journal: :American journal of physical anthropology 2012
Doug M Boyer Loïc Costeur Yaron Lipman

Plesiadapids are extinct relatives of extant euarchontans (primates, dermopterans, and scandentians), which lived in North America and Europe during the Paleocene and Early Eocene. The only genus of plesiadapid whose species are absent from Paleocene strata is Platychoerops. Further, Platychoerops is the only group found in sediments post-dating the Paleocene-Eocene boundary (PEB) by a substant...

2006
Laurie C. Anderson Joseph H. Hartman Frank Wesselingh

Freshwater corbulid bivalves found in Miocene deposits of western Amazonia have been considered products of an endemic radiation of a marine clade within the large lacustrine system occupying the region at that time. Our reexamination of Paleocene freshwater corbulids of the Tongue River Formation of western North Dakota and eastern Montana, however, extends the stratigraphic and geographic ran...

Journal: :Science 1999
Wilf Labandeira

The diversity of modern herbivorous insects and their pressure on plant hosts generally increase with decreasing latitude. These observations imply that the diversity and intensity of herbivory should increase with rising temperatures at constant latitude. Insect damage on fossil leaves found in southwestern Wyoming, from the late Paleocene-early Eocene global warming interval, demonstrates thi...

2014
Michael P. Donovan Peter Wilf Conrad C. Labandeira Kirk R. Johnson Daniel J. Peppe

Plant and associated insect-damage diversity in the western U.S.A. decreased significantly at the Cretaceous-Paleogene (K-Pg) boundary and remained low until the late Paleocene. However, the Mexican Hat locality (ca. 65 Ma) in southeastern Montana, with a typical, low-diversity flora, uniquely exhibits high damage diversity on nearly all its host plants, when compared to all known local and reg...

2013
Intizar H. Khan William C. Clyde

Analysis of lithofacies, paleoflow directions, and sandstone petrography of upper Paleocene-lower Eocene paralic and continental sediments exposed along the transpressional suture zone of the western margin of the Indian plate indicate that the process of deformation and uplift of the carbonate shelf in this area had started by late Paleocene time. This tectonic uplift and deformation is docume...

Journal: :journal of tethys 0

calcareous nannofossil assemblages of the boundary paleocene-eocene deposits (pabdeh formation) of the zagros, dezful embayment-mansouri oilfield have been studied in detail. it consists of shale and grey marlstone with inter layers of calcareous argillites and marly claystone. we present a study focused on changes in calcareous nannofossils of the pabdeh formation during the paleocene/eocene b...

2016
Peter A. Siver Alexander P. Wolfe Mark B. Edlund PETER A. SIVER ALEXANDER P. WOLFE MARK B. EDLUND

Fideliacyclus wombatiensis gen. et sp. nov. – a Paleocene non-marine centric diatom from northern Canada with complex frustule architecture Peter A. Siver, Alexander P. Wolfe & Mark B. Edlund To cite this article: Peter A. Siver, Alexander P. Wolfe & Mark B. Edlund (2016): Fideliacyclus wombatiensis gen. et sp. nov. – a Paleocene non-marine centric diatom from northern Canada with complex frust...

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