Global ETD Search
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Showing 1 to 12 of 12 for “"mouth bar"”.
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Differential Sedimentation In A Mississippi River Crevasse Splay
… emphasis on the development of a distributary mouth bar. Simultaneous hydroacoustic and optical measurements on the mouth bar show that the bar conforms to the progradational stage of an existing conceptual model of mouth bar development. This is confirmed by cores dated using Beryllium-7, …
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A Subsurface Stratigraphic Study of the Middle Atoka, Sebastian County, Arkansas
… across this portion of this basin. Distributary-mouth bar deposits dominate the Casey member, and are occasionally overlain by localized channel deposits. Avulsion of the delta lobe possibly occurred, and a new lobe then began to prograde, depositing the sediments that formed the Freiburg. This …
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Analysis of the Upper Cotton Valley Group in the Northeastern Mississippi Interior Salt Basin
… systems, interdeltaic systems, and transgressive barrier bar systems. Locations of potential stratigraphic traps can be identified by changes in net sand within the Dorcheat and Shongaloo members and showing sand pinchouts in local cross sections. This study suggests that most of the potential oil …
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Petrology and diagenesis of the lower Mississippian Price Formation, southwestern Virginia
… conclusions that these rocks represent distal bar and prodelta, wave-reworked distributary mouth bar, and upper delta plain deposits. Petrographically, the sandstones typically are fine-grained lithic arenites that were derived from a low-grade metamorphic provenance with lesser sedimentary and …
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Tidal sedimentation in the mid-Pennsylvanian Breathitt Group, eastern Kentucky
… were deposited in a delta-front/distributary-mouth-bar setting. Within the study area, the Magoffin Member ranges in thickness from 20 to 40 m. Where thickest, the Magoffm Member tends to be sandier and contain rhythmite intervals that are thicker and more complete than where it is thin. The …
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Controls on Stratigraphy and Architecture of Shallow-Water Deltas: Examples from the Early Cretaceous of Central-Eastern Spain
… cannibalisation and re-channelisation of the mouth bar top (autogenic process) leads to the creation of mouth bars consisting of multiple smaller-scale sub-bars, which is the first to be reported in ancient river-dominated deltas. At the larger delta depositional scale, the overall evolution …
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Hydrodynamic and sediment transport modeling of deltaic sediment processes
… the hypothesis that the early phases of deltaic bar and distributary channel formation and sediment transport on an adverse slope could be simulated with a 2D finite element sediment transport model. The models used were RMA2 and SED2D modules of the TABS-MD model suite. A finite element mesh of …
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3D GROUND-PENETRATING RADAR (GPR) INVESTIGATIONS: BURIED CULVERTS, HISTORICAL GRAVES, A SANDSTONE RESERVOIR ANALOG, AND AN IMPACT CRATER
… the internal structure of terminal distributary mouth bars in the Cretaceous Ferron Sandstone in southeastern Utah. Three radar facies were observed including a terminal distributary channel of 1.25 m thickness filled with distributary mouth bars, a progradational mouth bar with a dip angle of …
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Interpretation of coarsening upwards hemicycles in the Upper Paleozoic rocks of South-central West Virginia
… units with thick subunits), b) distributary mouth bar (convex top sandstones and siltstones), c) interdistributary bay (mainly grey mud-clay rocks, and aphanic, highly fossiliferous limestones with abundant <em>Spirorbis</em>, ostracodes), d) levee-splay (silt shale, sandy siltstone with …
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Anatomy of a Carboniferous transgression: upper Tullig Cyclothem, County Clare, Ireland
… delta plain muds and silts, progradational mouth bar sands, and finally the Reticuloceras stubblefieldi goniatite fossil bed. These changing paleoenvironments are interpreted in terms of the competition between relative sea-level change, which itself appears to be controlled by both eustatic …
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Tectonics and sedimentation in the Devonian and carboniferous rocks of SW Devon, England.
… of the rocks to the north and south of Plymouth reveals a sedimentary sequence deformed by a series of folds and thrusts. Two structural zones exist each with a different style of deformation. In the Lower to Upper Devonian rocks of the southern zone, slip vectors, vergence and facing of D …
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Morphodynamics of Ebb-Tidal Deltas
… as a proxy for the position of shallow sandbars. Oblique 20-minute averaged time-exposure images were geo-rectified to provide detailed spatial measurements of ebb-tidal delta features such as the terminal lobe, mouth bar, channel margin linear bars (or levees), and swash bars over the …