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Showing 1 to 20 of 59 for “"Paleogene"”.
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Late Paleogene (Eocene to Oligocene) paleoceanography of the northern North Atlantic
Seismic stratigraphic evidence from the western and northern North Atlantic indicates that a major change 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 …
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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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THE CLIMATIC, BIOTIC AND TECTONIC EVOLUTION OF THE PALEOGENE RENOVA FORMATION OF SOUTHWESTERN MONTANA
… Montana contains an important record of Paleogene floral, faunal, climate and tectonic change in the northern Rocky Mountains. The period between the end of the early Eocene and the early Oligocene (~49-32 Ma) was a time of rapid and far-reaching climate change. This period saw the end of …
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THE CLIMATIC, BIOTIC AND TECTONIC EVOLUTION OF THE PALEOGENE RENOVA FORMATION OF SOUTHWESTERN MONTANA
… Montana contains an important record of Paleogene floral, faunal, climate and tectonic change in the northern Rocky Mountains. The period between the end of the early Eocene and the early Oligocene (~49-32 Ma) was a time of rapid and far-reaching climate change. This period saw the end of …
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Updip Sequence Development on a Mixed Carbonate-Siliciclastic Continental Shelf, Paleogene, North Carolina, Eastern U.S.A.
… quarry exposures, and exploratory wells in the Paleogene Albemarle Basin, North Carolina sample the transition between the southern carbonate and northern siliciclastic provinces of the eastern U.S. continental shelf succession. The study area includes the relatively positive Cape Fear Arch on …
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Biostratigraphy of Cretaceous and Paleogene Strata from Northern Yukon Territory and District of Mackenzie, Northwest Territories
… correlations for Upper Cretaceous and Paleogene strata. Strata from the upper Bonnet Plume Formation of the Bonnet Plume Basin range in age from the late Campanian to late Paleocene/early Eocene. The diverse assemblages recovered from the Bonnet Plume Basin contribute to paleogeographic …
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Establishing geochemical constraints on mass accumulation rates across the Cretaceous-Paleogene boundary with extraterrestrial Helium-3
… sediments show shifts across the Cretaceous-Paleogene boundary (K-Pg) that are simultaneous with the extinction event and onset of the boundary clay deposition. However, the timescale of these records is difficult to determine near the boundary because of fluctuating sedimentation rates and …
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Paleogene-Early Neogene palynomorphs from the Eastern Equatorial Atlantic and Southeastern Florida, USA: Biostratigraphy and paleoenvironmental implications
<p>"The transition from greenhouse conditions (Paleocene-Eocene Thermal Maximum, PETM) to icehouse conditions (Early Oligocene) is not well documented in tropical-subtropical regions. One hundred and five samples from Ocean Drilling Program (ODP) Site 959 (Hole 959A and Hole 959D) in the Cote …
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Provenance of Eastern Magallanes Foreland Basin Sediments: Mineralogical and Geochemical Analyses Reveal Paleogene Tectonic Unroofing of the Fuegian andes
<p>Though southern South America and the Antarctic Peninsula were previously connected through a Paleozoic-Mesozoic subduction system on the western margin of Gondwana, this connection was tectonically disrupted in the Cenozoic by forming the Drake Passage in the Scotia Sea. Heavy mineral …
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Benthic foraminiferal change and depositional history across the Cretaceous – Paleogene (K/Pg) boundary in the Brazos River area, Texas
The Cretaceous–Paleogene (K/Pg) boundary marks one of the major crises in the history of life on Earth. The cause is widely regarded as a large bolide impact at Chicxulub, Mexico, coincident with a major series of volcanic eruptions on the Deccan Plateau, India. Fieldwork in the Brazos River area …
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High-Resolution Sequence Stratigraphy of Paleogene, Nontropical Mixed Carbonate/Siliciclastic Shelf Sediments, North Carolina Coastal Plain, U. S. A.
… stratigraphic development of the subsurface Paleogene, Albemarle Basin, North Carolina, was defined using well cuttings and wireline logs tied into largely published biostratigraphic and available seismic data. Facies include: silty and shelly sands and shell beds (estuarine/lagoon/protected …
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Responses of a shallow-water ecosystem to the early Paleogene greenhouse environmental conditions : evolution of Larger Foraminifera and coral communities from the Northern Tethys
… situation occurred during the early Paleogene, when catastrophic release of carbon to the atmosphere triggered abrupt increase in global temperatures. The best documented of these events is the Paleocene-Eocene Thermal Maximum (PETM, ~55 Ma) when the magnitude of carbon addition to …
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Geochemical Analysis of Ironstone Preserved Molluscan Fossils of the Hell Creek Formation (Cretaceous) and Ludlow Member of the Fort Union Formation (Paleogene) of Southwestern North Dakota
<p> The uppermost Cretaceous Hell Creek Formation and Paleocene Ludlow Member of the Fort Union Formation in easternmost Montana and western North Dakota produce ironstone preserved freshwater molluscan fossils. Ironstone preserved mollusks are associated with ironstone nodules, which have been …
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Cenozoic Sedimentary Evolution of the Helmville Basin, West-Central Montana
… Basin contains sedimentary and volcanic fill of Paleogene and Neogene age, along with abundant Quaternary sediment. The purpose of this study is to document the geologic evolution of the Helmville basin through a combination of field-based geologic mapping and sedimentologic characterization and …
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Cenozoic Sedimentary Evolution of the Helmville Basin, West-Central Montana
… Basin contains sedimentary and volcanic fill of Paleogene and Neogene age, along with abundant Quaternary sediment. The purpose of this study is to document the geologic evolution of the Helmville basin through a combination of field-based geologic mapping and sedimentologic characterization and …
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Cenozoic stratigraphic and tectonic history of the Grenada and Tobago basins as determined from marine seismic data, wells, and onland geology
… deep-marine seismic facies, and similar Paleogene sediment thickness suggest that the two basins formed as a single, Paleogene forearc basin related to the now dormant Aves Ridge. This single forearc basin continued to open through flexural subsidence during the early to middle Eocene …
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A molecular perspective on the family Testudinidae batsch, 1788
… evolutionary history dates back to the late Paleogene at least, and periods of diversification and expansion appear to be closely associated with global climate change, particularly at the border of the Oligocen-Miocene transition.
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High-resolution temporal records of magmatism, sedimentation, and faulting at evolving plate boundaries
… magmatism, deformation, and sedimentation during Paleogene ridge-trench interaction in western Washington. Chapter 1 creates a regional stratigraphy for nonmarine sedimentary and volcanic rocks throughout central and western Washington and demonstrates that the depositional history of these rocks …
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Extending the geological calibration of the geological time scale
… geological time scale is extended into the late Paleogene. This is achieved by generating a lithological proxy record employing an X-ray fluorescence Core Scanner that non-destructively determines elemental concentrations of calcium and iron on split sediment cores. These data exhibit cyclic …
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Extending the geological calibration of the geological time scale
… geological time scale is extended into the late Paleogene. This is achieved by generating a lithological proxy record employing an X-ray fluorescence Core Scanner that non-destructively determines elemental concentrations of calcium and iron on split sediment cores. These data exhibit cyclic …
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