Global ETD Search
Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
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Showing 1 to 20 of 228 for “"Eocene"”.
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A magmatic trigger for the Paleocene-Eocene Thermal Maximum?
… carbon into the ocean-atmosphere system. This Paleocene-Eocene Thermal Maximum (PETM) is often cited as an analogue of anthropogenic climate change. Many trigger mechanisms for the carbon release at the PETM have been proposed. Common to all scenarios is rapid release of isotopically light carbon …
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Palaeoclimatology, stratigraphy and biotic responses in the middle Eocene
The Middle Eocene (37 to 49 million years ago, Ma) was characterised by warmer global temperatures and higher atmospheric carbon dioxide (pCO2) levels than today with only<br/>small/non-existant icesheets. Because predicted pCO2 levels for the coming century have not been seen on Earth since at …
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Eocene to Miocene geology of southwest Viti Levu, Fiji
… Viti Levu. These represent part of an Upper Eocene to Lower Oligocene volcanic arc and were probably rifted to their present position during the formation of the South Fiji Basin in the mid-Oligocene. They are overlain with angular unconformity by the Upper Oligocene to Middle Miocene …
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A magmatic trigger for the Paleocene-Eocene thermal maximum?
… carbon into the ocean-atmosphere system. This Paleocene-Eocene Thermal Maximum (PETM) is often cited as an analogue of anthropogenic climate change. Many trigger mechanisms for the carbon release at the PETM have been proposed. Common to all scenarios is rapid release of isotopically light carbon …
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Paleoceanographic and Paleoclimatic Changes Associated With the Eocene-Oligocene Transition
<p>The Eocene-Oligocene transition (EOT) is one of the largest global paleoclimatic events of the past 50 myr. Surface and deep water temperature histories and variations in global ice volume were reconstructed using paired measurements of δ<super>18</super>O and Mg/Ca on benthic and …
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Marine carbonate accumulation during the greenhouse climate of the Eocene
… are known to have occurred during the Eocene epoch, between 56-34 Ma. The warmest interval of the Cenozoic culminated during early Eocene, punctuated by multiple events of rapid injection of isotopically light carbon into the ocean-atmosphere system, e.g. Paleocene Eocene Thermal …
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Remagnetization of the Eocene Oceanic Formation on Barbados, West Indies
Thesis (M.S.)--Massachusetts Institute of Technology, Dept. of Earth and Planetary Science, 1980.
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Ostracodes of the Piney Point formation (middle eocene) of Virginia
… to middle Jacksonian, or middle middle Eocene to middle late Eocene. This shows that the Piney Point Formation is time-transgressive, because the ostracodes from the type locality are strictly middle Claibornian (Brown et al., 1972). The ostracode assemblage of the Piney Point is typical …
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Late Paleogene (Eocene to Oligocene) paleoceanography of the northern North Atlantic
… in abyssal circulation occurred in the latest Eocene to earliest Oligocene. In the northern North Atlantic, the widely-distributed reflector R4 correlates with an unconformity that can be traced to its correlative conformity near the top of the Eocene. This horizon reflects a change from weakly …
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Factors influencing porosity and permeability, Wilcox Group (Eocene), Karnes County, Texas
Petrographic and petrophysical data from 57 sandstone samples collected from the available parts of a 2500 ft section of core (-5094 ft to -7474 ft) recovered from the Seaboard Oil Kolodziejcyk #1 well in southeastern Karnes County were used to determine the diagenetic changes within the rocks and …
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Chemical Weathering History of Antarctica During A Late Eocene Glacial Event
<p>Several proxies for ocean temperature, ice sheet growth, and continental weathering analyzed from ODP Site 738 sediments off the coast of East Antarctica have offered insight into the variable climate of the Paleogene 'greenhouse.' In this study, I compile evidence from fine fraction carbonate, …
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Palynostratigraphy of the Eocene Little River Section, Grays Harbor County, Washington
<p>A total of 27 samples from Eocene marine rocks exposed along the Little River, Grays Harbor County, southwestern Washington were analyzed for palynomorphs. Strata studied included the Crescent Formation, "Sedimentary Rocks of Late Eocene Age", and the Lincoln Creek Formation. A total of 77 micro …
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Sedimentology, Diagenesis and Reservoir Characteristics of Eocene Carbonates Sirt Basin, Libya
ABSTRACT The reservoir quality of Middle Eocene carbonates in the intracratonic Sirt Basin (at the northern margin of the African continent) is strongly influenced by depositional facies and various diagenetic modifications. This thesis investigates the petrography, sedimentology, diagenetic …
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Sedimentology of a fluvial sheet sandstone, Eocene Willwood formation, Bighorn Basin
Includes bibliographical references.
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Late Paleogene (Eocene to Oligocene) paleoceanography of the northern North Atlantic
Thesis (Ph.D.)--Massachusetts Institute of Technology, Dept. of Earth and Planetary Sciences, 1983.
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Mammalian Postcranial Evolution and Primate Extinction in the Middle Eocene of North America
… America during the early and middle parts of the Eocene: 55-46 ma). Beginning in the Uintan North American Land Mammal Age: 46-42 ma) primates declined in diversity and abundance in the Rocky Mountain region. This decline has been linked to the recession of tropical rain forests out of northern …
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A multi-proxy study of the Palaeocene - Eocene Thermal Maximum in northern Spain
At the boundary between the Paleocene and Eocene epochs (ca. 56 Ma) a significant global warming event, termed the Paleocene-Eocene Thermal Maximum (PETM), occurred. Records of this event are characterised by a negative carbon isotope excursion (CIE) which has been associated with the release of …
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Maastrichtian - upper Eocene ostracoda of the subfamily Trachyleberidinae from Iraq, Jordan and Syria
Abstract available: p 16.
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A Uintan (Late Middle Eocene) Flora and Fauna from the Uinta Basin, Utah
<p>Late Middle Eocene time marks one of the most dynamic periods of the Paleogene in the western interior of North America. Analysis of an extensive, new collection of plant, invertebrate, and vertebrae fossils from the Uinta Formation in the Uinta Basin, south of Myton, Utah, USA, provides …
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Stratigraphy and Palaeoenvironment of the Paleocene/Eocene boundary interval in the Indus Basin, Pakistan
Marine sedimentary sections across the Paleocene/Eocene (P/E) boundary interval are preserved in the Patala Formation (Upper Indus Basin) and Dungan Formation (Lower Indus Basin), Pakistan. The P/E interval of the Patala Formation is composed of limestone and shale inter-beds indicating deposition …
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