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 24 for “"shallow shelf"”.
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High-Resolution Sequence Stratigraphy of Paleogene, Nontropical Mixed Carbonate/Siliciclastic Shelf Sediments, North Carolina Coastal Plain, U. S. A.
… and shell beds (estuarine/lagoon/protected inner shelf facies); clean quartz sands and sandy mollusk-fragment grainstones (shoreface/shallow shelf); phosphatic hardgrounds (current and wave-swept shoreface and shallow shelf); bryozoan and echinoderm grainstones/packstones (storm reworked middle …
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Stratigraphic Analysis of the Capps Limestone in the North Norton Oil Field in Runnels County, Texas
… County appears to have been deposited on a shallow-shelf environment as is indicated by the laminated mudstones and fossiliferous limestones. The sandstone and mixed carbonate-siliciclastic units represent an influx of sand from fluvial-deltaic systems that were possibly active nearby. Shale …
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IMPLEMENTATION OF A VERTICALLY INTEGRATED ICE SHEET MOMENTUM BALANCE MODEL
… approximations to Stokes flow. It couples the Shallow Shelf Approximation (SSA) and Shallow Ice Approximation (SIA). This approximation is then differentiated symbolically. Efficient sparse matrix formats are manipulated directly to avoid invoking costly sorting routines in the underlying …
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IMPLEMENTATION OF A VERTICALLY INTEGRATED ICE SHEET MOMENTUM BALANCE MODEL
… approximations to Stokes flow. It couples the Shallow Shelf Approximation (SSA) and Shallow Ice Approximation (SIA). This approximation is then differentiated symbolically. Efficient sparse matrix formats are manipulated directly to avoid invoking costly sorting routines in the underlying …
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Paleoenvironmental interpretation of the Guilmette Formation near Ely, Nevada
… member--deposited in an intertidal-shallow lagoon with minor fluctuations of transgression and regression. 2) Lower mound member--deposited in a slightly restricted deep lagoon with an abundance of stromatoporoids. Small biohermal mounds are associated with this member. 3) Fore-mound …
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Exploring the Influence of Diurnal Forcing on Tidal Inlet Exchange and the Impact on the movement of Oxygen Depleted Waters in the Mississippi Sound and Bight Region
… in the Mississippi Sound and Bight (MSAB). The shallow shelf environment of the MSAB is affected by a host of complex physical interactions and separating the influences of each process is difficult to accomplish with <em>in-situ</em> data alone. A physical model using high-resolution …
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Geologic and limnologic history of Glovers Pond, northwestern New Jersey
… in the profundal zone. Marl is deposited on a shallow shelf by chemical and biochemical precipitation of CaCO3 . J caused primarily by blanketing growths of Chara; these provide a habitat for several of the nine species of gastropods and the three species of bivalves which live in the lake.</p> …
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Palynofacies and sedimentology of some Late Jurassic sediments from the British Isles and northern North Sea
… in an aerobic, hydrographically unstable, shallow shelf regime. palynofacies trends suggest an approximately NW-SE onshore-offshore gradient. Apart from scale the Piper sequence is analogous to coeval onshore sediments at Brora. The eudoxus-pectinatus zones of the Type Kimmeridge Clay were …
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Petroleum potential of the Tilston interval (Mississippian) of central North Dakota
… with the subtidal facies, deposited on a broad, shallow shelf. As the sea regressed this was followed by deposition of the shoal facies. Further regression resulted in the deposition of the tidal flat facies. The final regressive stage of the Tilston is marked by the deposition of the widespread …
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Coupling Metaproteomics with Taxonomy to Determine Responses of Bacterioplankton to Organic Perturbations in the Western Arctic Ocean
… distinct marine microbiomes within the shallow shelf ecosystem of the Chukchi Sea after rapid fluctuations in algal organic matter availability. Novel bioinformatics tools were collaboratively developed and used together with community proteomics (metaproteomics) to characterize and …
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Pollen stratigraphy of Holocene peat sites in Eastern Liguria, Northern Italy
… infilled basins within drift deposits as well as shallow shelf sites. However most of the peat sequences began to form only 4000 to 5000 years ago. At three sites there are strong indications that peat formation only occurred after major disruption of local soils which locally may have been …
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Contributions to the geology of the Table Mountain Group
… based on a transgressive fluvial - littoral - shallow shelf model (Tankard et al., 1982) following earlier facies and palaeoenvironmental analyses (Tankard and Hobday, 1977: Rust, 1977; Hobday and Tankard, 1978: Vos and Tankard, 1981). The validity of this model has recently been questioned …
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Updip Sequence Development on a Mixed Carbonate-Siliciclastic Continental Shelf, Paleogene, North Carolina, Eastern U.S.A.
… provinces of the eastern U.S. continental shelf succession. The study area includes the relatively positive Cape Fear Arch on the Onslow Block to the south, and the slowly subsiding (1.5 cm/ky) Albemarle Block to the north. The Paleogene supersequence set boundary is a hardground on …
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Movements, dive behavior and trophic ecology of leatherback turtles (Dermochelys coriacea) in the northwest Atlantic
… area-restricted search behavior and shorter, shallower dives occurring in cool, productive, shallow shelf habitat at temperate latitudes. Leatherbacks were highly aggregated in temperate shelf waters during summer, early fall, and late spring, and more widely dispersed in subtropical and …
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Palaeoecology of the late Permian mass extinction and subsequent recovery
… expansion of hypoxic and anoxic conditions into shallow shelf settings. Our understanding of the magnitude, pattern and duration of the extinction event and subsequent recovery remains equivocal. Evidence suggests that the action of waves provided an oxygenated refuge, i.e. ‘habitable zone’, …
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Depositional environments and diagenesis, Winnipegosis Formation (Middle Devonian), Williston Basin, North Dakota
… of deposition which include deep basin, deep shelf, shallow shelf, reef, lagoon, tidal flat, and evaporite basin. The deposition of the Winnipegosis and Prairie Formations were inter-related and occurred during six episodes. Following a brief hiatus separating the underlying Ashern Formation …
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Developing Recognition Criteria for Current-Wave-Enhanced Sediment Gravity Flows
… of oceanographic techniques including shallow seismic surveying, radioisotope geochemistry, sedimentary fabric analyses, and a rock record study to investigate (1) the mechanisms of sediment dispersal and accumulation on the muddy Southwest Louisiana (SWLA) Chenier Plain shelf, where …
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Early Mesozoic stratigraphy, sedimentology and structure of the
… facies from the Al Aziza Formation represent a shallow shelf platform area (inner ramp: an intertidal-subtidal carbonate flat to shelf lagoonal environment), which was deposited during the opening of the Early Triassic Neo-Tethys Ocean. Eleven localities from the Abu Shaybah Formation have been …
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Stratigraphy and depositional environments of the Fox Hills Formation (Upper Cretaceous), Bowman County, North Dakota
… fossils, the Fox Hills Formation represents shallow marine regressional deposits, predominately of storm origin, that were laid down in depths of less than 37 m, on a broad shelf, marginal and seaward of the advancing Hell Creek delta system. Deposition occurred: (1) steadily, from suspension …
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Triassic-Jurassic biochronology of the eastern Iskut River map area, northwestern British Columbia
… in a wide spectrum of near shore to off-shore shallow shelf to slope/basinal environments represented by the Composite assemblage depth zones B-D ofTaylor (1982). Nassellarian-spumellarian radiolarian ratios suggest that within the Salmon River Formation at Eskay Creek, both the contact zone …
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