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Showing 1 to 20 of 47 for “"Shoreface"”.
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Stratal Architecture in a Prograding Shoreface Deposit, Eastern Shore, VA: Relationship to Grain Size, Permeability, and Facies Distribution
<p>A fundamental concern of the stratigrapher is to develop predictive models of stratigraphic organization. In sedimentology one of the most significant problems that has yet to be resolved is the fact that there is a lack of quantitative information regarding the relationship between geometry of …
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Geomorphologic evolution of a rapidly deteriorating barrier island system with multiple sediment sources: Eastern Isles Dernieres, Louisiana, 1887 to 2006
… more than a kilometer. Wave ravinement on the shoreface of the islands is responsible for the most sediment loss; liberated sediment travels longshore to tidal inlets. The dominant ebb tidal currents then transport the sediment to where it is deposited in ebb tidal deltas or carried to the …
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Hydrodynamic Controls on Sedimentology and Geomorphology of Marine-Carbonate Ramps: Insights from a Holocene Analogue, Northern Yucatán Shelf, Mexico
… winter storms generate waves that propagate onto shoreface. This mixed energy, wave-dominated ramp system includes lagoon, barrier island, and upper shoreface geomorphic environments. Extensive shore-parallel sand bodies (beach ridges and subaqueous dune fields) of the high-energy upper shoreface …
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Investigating the evolution and formation of coastlines and the response to sea-level rise
… of cross-shore sediment flux to describe shoreface evolution and equilibrium profiles, utilizing linear Airy wave theory instead of shallow-water wave assumptions. By calculating a depth-dependent characteristic diffusivity timescale, I develop a morphodynamic depth of shoreface closure …
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Investigating the evolution and formation of coastlines and the response to sea-level rise
… of cross-shore sediment flux to describe shoreface evolution and equilibrium profiles, utilizing linear Airy wave theory instead of shallow-water wave assumptions. By calculating a depth-dependent characteristic diffusivity timescale, I develop a morphodynamic depth of shoreface closure …
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Late Quaternary variability in coastal changes along the Texas Gulf coast
… from back-barrier to beyond the toe of the shoreface were investigated to examine the Holocene evolution and the response of Follets Island (an end member transgressive barrier) and Matagorda Peninsula through North Padre Island (an end member of the stable barrier) to allogenic forcings. …
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Effects of Sedimentologic and Stratigraphic Heterogeneity on Production in Carbonate Reservoirs: An Integrated Outcrop, Synthetic Geologic Modeling, and Flow Simulation Study
… of hydrocarbon production from carbonate shoreface reservoirs, this study couples an outcrop-derived conceptual model and petrophysical data from reservoir analogs to generate a spectrum of simple geologic models of carbonate shoreface reservoir systems. The 25 geologic models, designed to …
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The sedimentology, palaeontology and stratigraphy of coastal-plain deposits at Hondeklip Bay, Namaqualand, South Africa
… high-wave-energy storm-deposition in the lower shoreface dominates the preserved record. With lowering of sea-level, the bedrock ridge emerged to the seaward of the prograding palaeoshoreline, reduced the level of incident wave energy and profoundly influenced the development of sub-environments …
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Os arenitos de praia de Itaipuaçu e Jacone - RJ: origem, idade, distribuição e influência no fluxo de sedimentos
The beachrock of Itaipuaçu is found on the upper shoreface at depths which varies from 2.5 m at the west side to 7.3 m at the east, and represents an evidence of a lower sea-level as the present one. It is related to the oldest Holocene barrier beach with a presumed age of about 7,000 years B.P. …
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Correlation and Paleoenvironments above West T9.3 Tuff, Pisco Formation, Peru
… to wave and storm dominated middle to upper shoreface. The sandstone is interpreted as a shoreface bar through lateral comparisons of unit thickness. Muddy siltstones and very fine-grained sandstones were reworked by waves and currents and hosted abundant burrowing organisms. Siltstone above …
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Unresolved Problems Involving the Hydrogeology and Sequence Stratigraphy of the Wasatch Plateau based on Mapping of the Wattis 7.5 Minute Quadrangle, Carbon and Emery Counties, Utah: Insights Gained from a New Geologic Map
… show normal marine conditions containing lower shoreface biota of <em>Skolithos</em> and <em>Ophiomorpha</em> overlain by middle shoreface sedimentary structures. The Star Point Sandstone deltaic parasequences likely prograded into the basin during pulses of thrusting from the Sevier Orogeny. …
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Signatures of land-ocean interactions in coastal morphology
… cross-shore and two-dimensional evolution of the shoreface, coral reefs, and volcanic ocean islands. Chapter 2 applies an energetics model, coupled with a 40-year wave-climate time series, to estimate crossshore sediment transport flux across the shoreface, illustrating how high-energy waves …
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Holocene Formation and Evolution of Horn Island, Mississippi, USA
… overwashed, and unable to build a sandy shoreface. This time period occurs during known rapid rates of relative sea-level rise of 4 mm/yr. Approximately 4,500 years BP coinciding with a deceleration in sea-level rise to about 1 mm/yr, radiocarbon ages associated with Horn Island’s barrier …
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A sedimentological and structural analysis of the Proterozoic Uncompahgre Group, Needle Mountains, Colorado
… of association A are succeeded by inner-shelf to shoreface cross-stratified sandstones of association B. Conglomerates and cross-bedded sandstones of upper association B represent alluvial braid-delta deposits. Tidal cross-bedded facies of the inner shelf/shoreface (association C) gradationally …
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Updip Sequence Development on a Mixed Carbonate-Siliciclastic Continental Shelf, Paleogene, North Carolina, Eastern U.S.A.
… set boundary is a hardground on Cretaceous shoreface/shallow-shelf mollusk facies. It is overlain by a thin Paleocene sequence of deeper offshore, glauconitic fine sands to deep marine silt-shale. Five regionally mappable, vertically stacked Eocene sequences are 0 to 30 m thick and contain …
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Περιβάλλοντα αποθέσεως των ιζημάτων του Πηδάσου (Ν.Δ. Πελοπόννησος)
… silt and silty sand beds were deposited in the shoreface or offshore zone.
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Stratigraphy, Sedimentology, and Ichnology of the Middle Cambrian to Lower Ordovician Deposits in Subsurface Western Canada
… conglomerate representing offshore to shoreface facies and wave-influenced prodelta to delta front settings. This succession provides a great opportunity to gain insight into the depositional processes and the endobenthic colonization of pre-vegetated and highly stressful settings in …
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Fluvial influence on high-frequency sedimentary cycle geometry: The transition from strandplain to deltaic deposition in the Cretaceous Point Lookout Sandstone, San Juan Basin, Colorado
… as distributary channel sandstones overlying shoreface deposits. Deposition in the study area, therefore, represents late highstand systems tract progradation and subsequent shelf-margin systems tract deltaic deposition. Posamentier and Vail's (1988) model of deposition during base-level fail …
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Stratigraphy, sedimentology and petrophysics of transgressive tight gas sandstones, Almond Formation, Wyoming
… by three depositional facies associations (DFA); shoreface, delta and fluvial/coastal plain, which present three distinctive porosity-permeability trends. Differences between petrophysical facies are primarily driven by diagenetic (cementation and grain dissolution) effects on different framework …
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High-Resolution Sequence Stratigraphy of Paleogene, Nontropical Mixed Carbonate/Siliciclastic Shelf Sediments, North Carolina Coastal Plain, U. S. A.
… 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 shelf); and fine skeletal wackestones and planktonic marls (slightly …
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