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 166 for “"Pliocene"”.
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Pliocene-Pleistocene Radiolarian Investigations of the Equatorial Oceans
This study explores and develops the application of Polycystine radiolarian microfossils to the investigation of Late Cenozoic deep-sea sediments recovered by the Deep Sea Drilling Program (DSDP) and Ocean Drilling Program (OOP), and utilizes these advances in undertaking a detailed …
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Paleocommunities of the Yorktown Formation (Pliocene) of Virginia
The fossiliferous Yorktown Formation (Pliocene) of Virginia was used as a natural laboratory for testing predictions of ecological and evolutionary theories. Specifically, coordinated stasis and ecological locking models have testable elements that can be analyzed using data from the Yorktown …
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Biochronology and magnetostratigraphy of the Pliocene Panaca Formation, southeast Nevada
… fossils were collected from 10 localities in the Pliocene Panaca Formation in Meadow Valley, southeast Nevada. The most common taxa are cricetid and heteromyid rodents, and lagomorphs. Twenty-seven species, including five new species, were recognized from the fauna. A new genus of microtine …
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Nannoplankton as indicators of climatic variability in the Upper Pliocene
Discoasters are the remains of an enigmatic group of nannoplankton, whose last representatives disappeared globally at 1.89 Ma. The one million years prior to their extinction has been analysed in high time resolution and a global database has been developed from ten sites in the Atlantic, Indian …
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The sedimentology and palaeoecology of the Coralline Crag (Pliocene) of Suffolk
The Coralline Crag is a Pliocene, shallow marine, bioclastic sand formation with an outcrop restricted to south-east Suffolk. Four distinct sedimentary facies have been recognised which indicate that the Coralline Crag was deposited during a single marine transgression. The stratigraphically lowest …
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Salamanders of the Mio-Pliocene Gray Fossil Site, Washington County, Tennessee.
… fauna for the southern Appalachian Mio-Pliocene; including at least five taxa from three modern families (Ambystomatidae, Plethodontidae, and Salamandridae) supporting the woodland-pond interpretation of the site. All specimens represent the earliest record of their respective families …
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Non-Ranid Anurans of the Mio-Pliocene Gray Fossil Site, Tennessee
<p>Researchers at the GFS, Washington County, Tennessee through the wet screening of nearly 100%of the sediment excavated at the site, recovered an extensive collection of anuran fossil elements. Until recently, these specimens have not been analyzed. The purpose here is the examination, …
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Geology of Mangapanian (late pliocene) strata, Wanganui Basin: lithostratigraphy, paleontology and sequence stratigraphy
Fourteen Mangapanian and early Nukumaruan (late Pliocene) cyclothems in Wanganui Basin have been studied, stratigraphically logged and geologically mapped in thirteen sections from west to east across the basin. The Mangapanian succession contains two subgroups. The Paparangi Subgroup contains …
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Orbital and Suborbital Climate Variability during the Pliocene Intensification of Northern Hemisphere Glaciation
The late Pliocene is marked by the end of an interval of warm, relatively stable global climate and a<br/>secular shift into a bipolar glaciated world. The intensification of northern hemisphere glaciation<br/>(iNHG) central to this climatic transition was accompanied by a decrease in …
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Lithofacies of the Pliocene-Pleistocene Lucayan Limestone, Great Abaco Island, Little Bahama Bank
<p>Petrographic and sedimentologic analyses of eleven shallow subsurface cores (3 to 19 meters in length) from the Lucayan Limestone where it occurs along northeastern Great Abaco Island (little Bahama Bank) are used to delineate five carbonate lithofacies. The most prevalent lithofacies is a …
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Protein Preservation in Fossil Whale Bones of the Miocene/Pliocene Pisco Formation, Peru
Fossil remains have recently been the focus of considerable attention due to several independent reports of protein and soft-tissue preservation in ancient biological remains. The fossil whales from the Pisco Formation in Peru were previously reported to be very well preserved. A considerable …
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Age, Stratigraphy and Depositional Environment of the Pliocene Copper Canyon Formation, Death Valley, California
<p>The Copper Canyon Formation, a fluvial-lacustrine deposit exposed within the Black Mountains of Death Valley National Park, has only previously been broadly included in regional tectonic and depositional analyses. The formation is significant because it preserves numerous shoreline-playa …
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Analysis of dental pathologies in the Pliocene herbivores of Langebaanweg and their palaeoenvironmental implications
… the local palaeoenvironment during the Early Pliocene.
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ANTARCTIC GLACIAL CHRONOLOGY REFLECTED IN THE OLIGOCENE THROUGH PLIOCENE SEDIMENTARY SECTION IN THE ROSS SEA
… underlying the Ross Sea. The Oligocene through Pliocene portion of this glacial marine section is studied using depositional models derived from the abundant piston core data in the region. The sedimentologic evidence from the Ross Sea glacial section is combined with evidence from the …
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Pliocene-Pleistocene landscape evolution in south-central Chile : interactions between tectonic, geomorphic, and climatic processes
… sedimentology, and morphometry to quantify the Pliocene-Pleistocene landscape evolution of the tectonically active south-central Chile forearc. Thereby, I provide (1) new results about the influence of seismotectonic forearc segmentation on the geomorphic evolution and (2) new insights in the …
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The petrogenesis of the Pliocene Araral stratovolcano in the Andean Central Volcanic Zone, Northern Chile
… are predominantly Quaternary in age with some Pliocene lavas. Mafic volcanism in the APVC, and more specifically mafic volcanism during the Pliocene, is understudied.
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Fossil preservation and the effects of groundwater leaching on fossils in the Yorktown Formation (Upper Pliocene), Virginia
Patterns of fossil diagenesis caused by groundwater leaching provide insight into how shells are altered. This study analyzes fossils in unconsolidated terrigenous sediments from the Virginia Coastal Plain, unlike previous studies conducted mostly in carbonate terranes. The vertical and lateral …
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