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 30 for “"Late Glacial"”.
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Biostratigraphy and palaeolimnology of late-glacial and holocene lake marls at Quidenham Mere, Norfolk.
… records extending back to the beginning of the Late-glacial. The exceptions are the Meres of central East Anglia that are infilled with organic sediments, providing detailed vegetational records. Of these, Quidenham Mere is unique because its sedimentary infill is composed largely of lake marls. …
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Late glacial and Holocene marine geology, palaeoceanography and palaeoecology of the Northern Isles of Scotland
… thesis aims to increase our understanding of the Late glacial and Holocene marine geology, palaeoceanography and palaeoecology of the northwestern North Sea. Chapters 2 and 4 investigate the sedimentary expression of the Storegga tsunami event (ca. 8,150 cal a BP), and the implications for the …
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The late glacial and post glacial history of the Vale of Pickering and northern Yorkshire Wolds
… as part of a wider attempt to re-interpret the late Quaternary history of the Vale of Pickering and Northern Wolds in Yorkshire. This involved the critical analysis of part evidence together with the collation and interpretation of data from a variety of sources, some published, some unpublished …
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Palynology of late-glacial and postglacial sediments in Georgian Bay, Ontario, Canada, as related to the Great Lakes history /
… transportation of pollen and spores, and (3) the late- and postglacial history of vegetational and climatic changes in the Georgicin Bay region. Modem pollen and spore assemblages in Georgian Bay do reflect the surrovinding vegetation when preservation and pollen production by the different …
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Late glacial to Holocene climate and vegetation changes on the Tibetan Plateau inferred from fossil pollen records in lacustrine sediments
… in central Asia, and especially on the Tibetan Plateau (TP), is of great importance for an understanding of global climate processes and for predicting the future climate. As a major influence on the climate in this region, the Asian Summer Monsoon (ASM) and its evolutionary history are of vital …
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Lake and fjord sediments as Late Glacial to Holocene environmental and climate archives of the southernmost Andes at 53°S, Chile
… (53°S) within the interdisciplinary project "Late and Post Glacial Environmental Conditions in the Range of the Southern Hemispheric Westerlies". Twelve coring locations in the different geographical, geological and vegetational zones of the transect, were selected as drill sites on the basis …
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The late quaternary vegetational history of Holderness, Yorkshire
… of plants into this country, particularly in Late-glacial and early Flandrian times, when the region was joined to the continent by dry land. As a distinct and somewhat isolated region of low-lying land which must have been rather waterlogged for much of Post-glacial time it would have …
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Uranium-series radionuclide records of paleoceanographic and sedimentary changes in the Arctic Ocean
… the first ²³⁰Th-normalized particle fluxes calculated for the central Arctic: vertical particle fluxes were extremely low during the late glacial, rose during the deglaciation due to particle inputs from shelf inundation, increased productivity and ice-rafted debris, and fell again following the …
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Uranium-series radionuclide records of paleoceanographic and sedimentary changes in the Arctic Ocean
… the first 230Th-normalized particle fluxes calculated for the central Arctic: vertical particle fluxes were extremely low during the late glacial, rose during the deglaciation due to particle inputs from shelf inundation, increased productivity and ice-rafted debris, and fell again following the …
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Strandline and Sediment Analysis of Stump Lake Area, Nelson County, North Dakota
… of this paper is to describe and interpret the late glacial and Recent history of Stump Lake, a closed basin lake, in Helson County, North Dakota, T. 151 N., R. 60 W. (see fig . 1). The work was started as a summer project under a National Science Foundation Undergraduate Research Participation …
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Rates of natural climate change : a study of speleothems
… for an early transition from the penultimate glacial to the last interglacial at -140 Ka BP. The database suggests an age of 63 Ka BP for the maximum cold period within isotope stage 4. Isotope stage 3 contains three periods of increased number of growing speleothems, at 40,50 and 56 Ka BP …
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Geochemical tools and paleoclimate clues : multi-molecular and isotropic investigations of tropical marine sediments and alpine ice
… has undergone dramatic changes since the last glacial period, as evidenced from Cariaco Basin (Venezuelan coast) and Peru Margin marine sediment biomarker records. Compounds derived from vascular plant leaf waxes and delivered to the marine sedimentary environment, including long-chain …
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Late Devensian and early Flandrian vegetational history and deglacial chronology of Western Argyll
… Loch Etive and the Cowal Peninsula during the Lateglacial and early-postglacial periods, and to reconcile the varied reconstructions of Loch Lomond Readvance glaciers, proposed on geomorphic data, in the light of the palynological evidence. Two Lateglacial biostratigraphies were examined by …
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The Late Quaternary palaeoecological history of the Great Wold Valley
… Valley, yielded fossil-rich deposits from the late-glacial and Flandrian periods. Although the sedimentary history of this site would appear to be incomplete, an exceptionally detailed image of the palaeoecological history of this valley emerges. The transition from the late-glacial fen and …
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Étude paléogénétique du cerf élaphe (Cervus elaphus) au cours de la transition Tardiglaciaire - Holocène ancien du Jura (15 000 – 6 000 BP) : relations entre changements morphologiques, environnementaux et génétiques
The Late-Glacial - Holocene transition, around 13,000 to 8,000 years ago, is the world theatre of an ample climatic upsetting associated to a deep change of the landscapes. Around the rock-shelter of Rochedane, an archaeological site from the French Jura, the climate shifts from peri-glacial to …
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Late Quaternary vegetation history of Craven, Yorkshire Dales.
This thesis investigates new late Quaternary vegetation records from four sites in the Craven District of the Yorkshire Dales. The chosen sites fall along an east-west transect broadly following the line of the south Craven Fault. The rationale for site selection was not based on conventional …
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Geochemical tools and paleoclimate clues : multi-molecular and isotopic investigations of tropical marine sediments and alpine ice
… has undergone dramatic changes since the last glacial period, as evidenced from Cariaco Basin (Venezuelan coast) and Peru Margin marine sediment biomarker records. Compounds derived from vascular plant leaf waxes and delivered to the marine sedimentary environment, including long-chain …
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Quaternary glaciation in the Pindus Mountains, Northwest Greece
… soil analysis and Uranium-series dating. Four glacial events are recorded in the sedimentological and geomorphological records. The more extensive recorded glaciation pre-dates 350,000 years BP and was characterised by extensive valley glaciers and ice-fields. A second glaciation occurred prior …
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Ice age wetland biogeochemistry: The influence of carbon dioxide starvation on wetland methane emissions
… of methane (CH<sub>4</sub>) during the Last Glacial Maximum (LGM) was 40-50% lower than during the preindustrial Holocene. To understand this natural variation it is important to know how the sources and sinks of CH<sub>4</sub> change over time. Natural wetlands were the single largest …
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