نتایج جستجو برای: lower eocene

تعداد نتایج: 695634  

Journal: :Bulletin of the Geological Society of Denmark 2004

2006
Koji Seto Ritsuo Nomura Nobuaki Niitsuma

Oxygen and carbon isotope ratios of benthic foraminifers were measured on the continuous middle to lower bathyal sedimentary sequence dated from the upper Maestrichtian to lower Eocene which was recovered at Site 752 in the eastern Indian Ocean. The changes in the carbon isotope values can be correlated with the faunal changes of the benthic foraminifers.

2003
Dick Kroon Takashi Hasegawa

This report was prepared from shipboard files by scientists who participated in the cruise. The report was assembled under time constraints and does not contain all works and findings that will appear in the DISCLAIMER Any opinions, findings, and conclusions or recommendations expressed in this publication are those of the author(s) and do not necessarily reflect the views of the National Scien...

2008
Sonja Spasojević Lijun Liu Michael Gurnis Dietmar Müller

[1] The dynamic subsidence of the United States east coast is addressed using the discrepancy between regional and global estimates of sea level, elevation of paleoshorelines, and adjoint models of mantle convection that assimilate plate motions and seismic tomography. The positions of Eocene and Miocene paleoshorelines are lower than predicted by global sea levels, suggesting at least 50 m, an...

2017
Werner Schwarzhans Thomas Mörs Andrea Engelbrecht Marcelo Reguero Jürgen Kriwet

The first record of fossil teleostean otoliths from Antarctica is reported. The fossils were obtained from late Early Eocene shell beds of the La Meseta Formation, Seymour Island that represent the last temperate marine climate phase in Antarctica prior to the onset of cooling and subsequent glaciation during the late Eocene. A total of 17 otolith-based teleost taxa are recognized, with 10 bein...

Journal: :Philosophical transactions. Series A, Mathematical, physical, and engineering sciences 2013
Jeffrey T Kiehl Christine A Shields

The Palaeocene-Eocene Thermal Maximum (PETM) was a significant global warming event in the Earth's history (approx. 55 Ma). The cause for this warming event has been linked to increases in greenhouse gases, specifically carbon dioxide and methane. This rapid warming took place in the presence of the existing Early Eocene warm climate. Given that projected business-as-usual levels of atmospheric...

2008
Jochen Knies Ute Mann Brian N. Popp Ruediger Stein Hans-Jürgen Brumsack

[1] Study of bulk nitrogen contents and isotopic composition in Arctic Ocean sequences (Integrated Ocean Drilling Program Expedition 302) over the past 60 Ma revealed changes in the export flux and sources of sedimentary nitrogen. The paleoproductivity calculated from the fraction of organic nitrogen to total nitrogen is distinctly lower (<20 g C m 2 a ) during the ice-covered Neogene compared ...

2007
Thierry Smith Rajendra S. Rana Pieter Missiaen Kenneth D. Rose Ashok Sahni Hukam Singh Lachham Singh

The geographic origin of bats is still unknown, and fossils of earliest bats are rare and poorly diversified, with, maybe, the exception of Europe. The earliest bats are recorded from the Early Eocene of North America, Europe, North Africa and Australia where they seem to appear suddenly and simultaneously. Until now, the oldest record in Asia was from theMiddle Eocene. In this paper, we report...

Journal: :Philosophical transactions. Series A, Mathematical, physical, and engineering sciences 2013
Navjit Sagoo Paul Valdes Rachel Flecker Lauren J Gregoire

Geological data for the Early Eocene (56-47.8 Ma) indicate extensive global warming, with very warm temperatures at both poles. However, despite numerous attempts to simulate this warmth, there are remarkable data-model differences in the prediction of these polar surface temperatures, resulting in the so-called 'equable climate problem'. In this paper, for the first time an ensemble with a per...

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