Tidal effects on the shoreface: Towards a conceptual framework

Dashtgard, Shahin E.; MacEachern, James A.; Frey, Shannon; Gingras, Murray K.

doi:10.1016/j.sedgeo.2010.09.006

Cited by 100 publications

(85 citation statements)

References 41 publications

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“…This zone extends from the offshore zone, below storm wave base, to depths where storm waves begin to agitate sediments. It is more sandrich compared to the offshore zone and is dominated by alternating energy conditions (Reading & Collinson, 1996;Dashtgard et al, 2012). Storms generally control sediment distribution in the offshore transition zone by erosion of the coastline.…”

Section: Descriptionmentioning

confidence: 99%

“…Fine sediments (background sedimentation) are deposited from suspension during fair weather conditions. Typical signatures of storm deposits are a basal lag of coarse sediments, hummocky cross-stratification, wave-rippled cross-lamination and burrowed intervals (Johnson & Baldwin, 1996;Dashtgard et al, 2012). Bioturbation tends to decrease from proximal to distal settings.…”

Section: Descriptionmentioning

confidence: 99%

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Facies development of the Upper Triassic succession on Barentsøya, Wilhelmøya and NE Spitsbergen, Svalbard

Lord¹,

Johansen²,

Støen³

et al. 2017

NJG

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Field data collected from the northeasternmost Triassic exposures on the islands of Spitsbergen, Wilhelmøya and Barentsøya during 2015 are used for sedimentological facies analysis to improve our understanding of the stratigraphic development of the Upper Triassic strata. Results presented here build upon previous studies from the eastern areas of the Svalbard archipelago and seek to extend this understanding northward. Paralic deltaic sediments are recognised throughout the field area, and our analysis shows that the Upper Triassic De Geerdalen Formation is composed of three discrete units defined by the differences in gross depositional environments. The lower interval of early Carnian age is dominated by shallow-marine and delta-front/ shoreface deposits, the middle interval of mid Carnian age is dominated by delta-front to delta-top deposits, and the upper interval, corresponding to the Isfjorden Member, of a late Carnian to early Norian age, is dominated by delta-top deposits which include lagoonal and lacustrine deposits. These observations show that the De Geerdalen Formation represents a more distal depositional setting, than the depositional environments previously reported from the islands of Edgeøya and Hopen. We also document the presence of the Tschermakfjellet Formation and Isfjorden Member on Wilhelmøya, thus increasing our understanding of the northwestward development of the Upper Triassic succession in Svalbard.

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Section: Descriptionmentioning

confidence: 99%

Section: Descriptionmentioning

confidence: 99%

Facies development of the Upper Triassic succession on Barentsøya, Wilhelmøya and NE Spitsbergen, Svalbard

Lord¹,

Johansen²,

Støen³

et al. 2017

NJG

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show abstract

“…Kennedy and Droser (p. 584) state that such bedforms "are not known in marine environments." However, they are known from a number of modern and ancient gravelly shoreface deposits (e.g., Hart and Plint, 1989;Dashtgard et al, 2010). Similarly, the submature sandstone composition is not a guarantor of a fl uvial origin.…”

mentioning

confidence: 99%

Early Cambrian metazoans in fluvial environments, evidence of the non-marine Cambrian radiation: COMMENT

Davies

Gibling

2012

Geology

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“…Modern environments have been investigated (e.g. Yang and Chun, 2001;Yang et al, 2005Yang et al, , 2006Yang et al, , 2008aDashtgard et al, 2009Dashtgard et al, , 2012 and the double influence (waves and tides) was clearly pointed out by sedimentological and/or ichnological evidences. These studies on modern environments are mainly based on boxcore analysis, thus giving a vertical (temporal) view to the observations but do not allow to understand the timing of formation of each bedform as well as their lateral evolution.…”

Section: Introductionmentioning

confidence: 99%

Bedforms in a tidally modulated ridge and runnel shoreface (Berck-Plage; North France): implications for the geological record

Vaucher

Pittet

Passot

et al. 2018

BSGF - Earth Sci. Bull.

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-Tidally modulated shoreface (TMS) corresponds to peculiar costal environments. The general morphology and the expressed bedforms are provided by the interplay of both waves and tides. The recognition of TMS in the fossil record still remains a difficult task. The study of one mega-tidal modern TMS in the north of France (Berck-Plage) provides new key criteria to identify this kind of coastal system in the rock record. Field investigation and digital mapping were realized at lowest tide during spring tide under fair-weather condition. The intertidal zone is characterized by a succession of several sand banks shore parallel separated by topographic lows that are defined as ridges and runnels. Seven distinct dominant bedforms are recognized: 3D current ripples, 3D asymmetrical ripples, 2D symmetrical ripples, 2D small symmetrical dunes, 2D large symmetrical dunes, 3D symmetrical dunes and plane beds. The upper stage plane bedding mainly composed the ridges while the six other bedforms are commonly found within the runnels or on the flanks of the ridges. Comparison of the bedforms of Berck-Plage with previous experimental studies on bedforms genesis proves that the necessary flow parameters for generating these bedforms belong to an oscillatory flow except for the 3D current ripples, which are formed by a unidirectional flow. This study confirms the dominance of oscillatory structures through the intertidal zone in a mega-tidal context and show that wave processes are more powerful than tide processes for bedform generation although during fair weather conditions. Based on the timing of genesis, the description and the repeated pattern of distribution of bedforms between two ridges is highlighted thus helping to propose a theoretical facies sequence for an intertidal zone characterized by ridges and runnels applicable to ancient sedimentary successions.Keywords: waves / tides / ridge and runnel / bedforms / stratigraphy / Berck-Plage / France Résumé -Structures sédimentaires d'une zone intertidale en barre et bâches dominée par la houle (Berck-Plage ; Nord de la France) : implications pour le registre sédimentaire ancien. Les plages et avant-plages sous l'influence de la houle et modulées par l'action de la marée, correspondent à des environnements côtiers particuliers. Leurs géomorphologies générales ainsi que les structures sédimentaires associées résultent de l'action combinée de la houle et de la marée. L'identification de ces environnements atypiques dans des successions sédimentaires anciennes demeure difficile. L'analyse d'un environnement mégatidal semi-diurne actuel dans le Nord de la France (Berck-Plage) a permis de fournir de nouveaux critères de reconnaissance pour ce type de système côtier hybride dans le fossile. Une étude de terrain ainsi qu'une cartographie numérique ont été réalisées à marée basse au cours d'une marée de vives-eaux. La zone intertidale est caractérisée par une succession de plusieurs bancs de sables parallèles à la côte et qui sont définies comme des barres (topographie po...

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Tidal effects on the shoreface: Towards a conceptual framework

Cited by 100 publications

References 41 publications

Facies development of the Upper Triassic succession on Barentsøya, Wilhelmøya and NE Spitsbergen, Svalbard

Facies development of the Upper Triassic succession on Barentsøya, Wilhelmøya and NE Spitsbergen, Svalbard

Early Cambrian metazoans in fluvial environments, evidence of the non-marine Cambrian radiation: COMMENT

Bedforms in a tidally modulated ridge and runnel shoreface (Berck-Plage; North France): implications for the geological record

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