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 9 of 9 for “"Marine Incursions"”.
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Palynological Evidence for the Paleoenvironmental History of the Miocene Llanos Basin, Eastern Colombia
… environments, including those produced by marine incursions and to understand the history of the vegetation of the basin. A total of 115 palynological samples was counted, with a minimum of 300 palynomorphs per slide when possible. The core was dated from 22 to 5 My based on the graphic …
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The role of gypsum in Cu-Co ore genesis within the Upper Miocene Boleo deposit of the Santa Rosalía Basin, Baja California Sur, México
… trends driven by tectonic subsidence and marine incursions. Mineralization at the top of clastic sediments and the base of gypsum cycles indicates coeval deposition of evaporites and ores. The study identifies segmented normal fault arrays as feeder zones for metal-enriched hydrothermal …
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Stratigraphic and microfossil evidence of repeated late Holocene tsunami inundation at Sitkalidak Island, Alaska
… sand beds, including the presence of anomalous marine planktonic diatoms, high fragmentation of diatoms, and upward fining sand sequences, indicate high-energy marine incursions consistent with tsunami inundation. Radiocarbon dating constrains the deposition of the sand beds to AD 1964, AD 1788, …
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The sedimentology and petrology of the new red sandstone of the Elgin Basin, North East Scotland
… continental in character although periodic marine incursions occurred from the main Norwegian Basin to the east.To the south of the basin at Elgin, deposition began during the Upper Permian with a series of sheetflood deposits which graded laterally into seif dunes to the north. Deposition …
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The sedimentology and lithostratigraphy of the Upper Jurassic Lourinha formation, Lusitanian Basin, Portugal
… phase in the development of the Lusitanian Basin marine shelf and slope systems were replaced by alluvial fan and fluvial environments which prograded from the nonh during the late Kimmeridgian. Continental environments, periodically punctuated by marine incursions, persisted over northern and …
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Palynology, palynofacies and hydrocarbon potential of the Cretaceous rocks of northern Egypt
… have been recognised<br/>due to the complete marine nature of the early Santonian sediments of the Abu<br/>Tunis 1x borehole.<br/>In order to understand the palaeoenvironmental conditions prevailing in the<br/>two boreholes during the deposition of the clastic and carbonate …
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Reinterpreting vintage geophysical data from the Algoa and Gamtoos Basins, South Africa: an integrated sequence stratigraphic framework since the middle Mesozoic
… systems that were increasingly dominated by marine processes, especially in the distal hanging walls. Marine incursions are detected in the Upper and Middle Jurassic in the Algoa and Gamtoos Basins, respectively. However, the severely eroded Algoa Basin syn-rift succession, exacerbated by …
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Controls on the geometry, stratigraphic distribution and quality of coals of Middle to Upper Jurassic strata in eastern Australia
… indicate periods of brackish water conditions. Marine incursions may have come from the north and the east during time of high eustatic sea-level during the Jurassic. Palaeogeographic reconstructions over 13 Ma reveal extensive fluviolacustrine systems draining from an eroding orogenic belt into …
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Tephrostratigraphy, petrography, geochemistry, age and fossil record of the Ganigobis Shale Member and associated glaciomarine deposits of the Dwyka Group, Late Carboniferous, southern Africa
… fine-grained glaciolacustrine or glaciomarine deposits. The uppermost part of the second deglaciation sequence comprises a thick fossiliferous mudstone unit, referred to as the ”Ganigobis Shale Member”. An abundance of marine macro- and ichnofossils as well as extrabasinally derived …