Abstract: Inner Shelf Sediment Distribution and Thickness Patterns in a Mixed Carbonate/Siliciclastic Depositional Setting

A new late Osagean (Lower Mississippian) crinoid fauna is described from the Muldraugh Member of the Borden Formation of central Kentucky. The Muldraugh Member records a mixed carbonate-siliciclastic tempestite-dominated ramp environment. This is the first report of late Osagean crinoids from this depositional setting on the eastern side of the Eastern Interior Basin of the midcontinental United States. The Muldraugh crinoid fauna contains 66 species and is dominated by advanced cladids. This fauna has similarities to other late Osagean faunas but is distinctive both in species abundance and rank order abundance of species. Eight new species are described from this fauna, includingCamptocrinus nudus, Paradichocrinus ramus, Poteriocrinites horowitzi, Parascytalocrinus pentagonus, Abrotocrinus debrae, Abrotocrinus springeri, Worthenocrinus hardinensis, andMespilocrinus myllos.

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Detailed Lithofacies and Architectural Facies Analyses on Mixed Carbonate-Siliciclastic Clastic Shoreline Depositional Environment of the Cibulakan Formation in Cipamingkis River, Jonggol, Bogor, West Java

10.29118/ipa21-g-61 ◽

2021 ◽

Author(s):

E. Edwin

Keyword(s):

Spatial Variation ◽

Depositional Environment ◽

Field Observations ◽

West Java ◽

Thin Sections ◽

Fragment Type ◽

Interesting Study ◽

Facies Modelling ◽

Depositional Setting ◽

Mixed Carbonate

Cibulakan Formation as one of the prolific hydrocarbon-bearing intervals has become an interesting study object for many researchers. The continuous outcrop of the Cibulakan Formation in the Cipamingkis River comprises claystone, sandstone, and subordinate limestone of grainstone, packstone, and wackestone facies. The outcrop should be able to give a clearer vertical and spatial variation of sandstone and limestone geometry compared to the conventional core alone. Field observations followed by measuring the section is conducted to distinguish lithofacies and to create a stratigraphic profile from the chosen interval. Samples and thin sections from sandstone and limestone lithofacies are observed further to determine fragment type variation, matrix, cement, texture, and porosity types qualitatively. Fourteen (14) lithofacies have been recognized from the observation, i.e., Slumped Sandstone (A1), Claystone (A2), Slightly-bioturbated Sandstone (B1), Cross-laminated Sandstone (B2), Parallel-laminated Siltstone (B3), Calcareous Claystone (B4), Moderately-bioturbated Sandstone (C1), Hummocky Cross-stratified Sandstone (C2), Skeletal – Coral clast Wackestone (C3), Skeletal-clast Packstone (C4), Coralline Foraminiferal Boundstone (C5), Low-angle Planar Cross-bedded Sandstone (D1), Intensely-bioturbated Sandstone (D2), and Trough Cross-bedded Sandstone (D3). There are four architectural facies in the research interval and each of them is composed of different and specific lithofacies. An ideal parasequence is composed of all Architectural Facies namely : (A) Offshore-Transition (B) Lower Shoreface (C) Upper Shoreface with the whole thickness range between 15 to 25 m and the parasequence shows thickening upward succession. The detailed information about the lithofacies and architectural facies hopefully will provide a better understanding of the facies modelling of the mixed carbonate-siliciclastic depositional setting, new insights for parasequence recognition in clastic shoreline depositional environment and become a reference for other areas lacking in core data and/or outcrop analogue.

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Conceptualising and mapping coupled estuary, coast and inner shelf sediment systems

Geomorphology ◽

10.1016/j.geomorph.2015.10.006 ◽

2016 ◽

Vol 256 ◽

pp. 17-35 ◽

Cited By ~ 18

Author(s):

Jon French ◽

Helene Burningham ◽

Gillian Thornhill ◽

Richard Whitehouse ◽

Robert J. Nicholls

Keyword(s):

Inner Shelf ◽

Shelf Sediment

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SEDIMENT TRANSPORT ON THE SOUTH-EAST AUSTRALIAN CONTINENTAL SHELF

Coastal Engineering Proceedings ◽

10.9753/icce.v19.131 ◽

1984 ◽

Vol 1 (19) ◽

pp. 131 ◽

Cited By ~ 1

Author(s):

Angus D. Gordon ◽

John G. Hoffman

Keyword(s):

Sediment Transport ◽

Continental Shelf ◽

Suspended Sediment ◽

Transport System ◽

Sediment Concentration ◽

High Energy ◽

Sediment Distribution ◽

Sediment Movement ◽

Shelf Sediment ◽

Sea Bed

Engineering projects on the continental shelf off Sydney, Australia, have stimulated investigation into the sediment transport system of the shelf. Investigation activities associated with these projects have included: definition of sea bed morphology, sediment distribution and bedform characteristics; monitoring of steady and wave induced currents; wind data collection; suspended sediment sampling; bottom camera sediment movement investigations and analytical studies of sediment reaction to sea bed forcing functions. Sea bed velocity exceedence relationships for both wave oscillations and steady currents have been determined at depths of 24 m, 60 m and 80 m. Thresholds of sediment movement have been defined. Relative sediment transport computations have been undertaken and studies of suspended sediment concentration profiles are in progress so that absolute transport rates can be determined. The prevailing conditions, which include a mainly south bound current, are seldom sufficient to induce entrainment of shelf sediments. Transport events mainly result from major storms in the Tasman Sea which produce both high energy waves and north bound currents. Although these events are rare and short lived, the combined wave and current shear produced at the sea bed during the events gives rise to entrainment conditions which result in their dominance of the shelf sediment transport system.

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Nearshore—Inner Shelf Sediment Exchange on the NSW Central Coast

Coastal Engineering 2000 ◽

10.1061/40549(276)245 ◽

2001 ◽

Author(s):

Peter Evans ◽

David Hanslow ◽

Aaron Coutts-Smith ◽

Zai-Jin You

Keyword(s):

Central Coast ◽

Inner Shelf ◽

Shelf Sediment

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Sediment-starved sand ridges on a mixed carbonate/siliciclastic inner shelf off west-central Florida

Marine Geology ◽

10.1016/s0025-3227(03)00182-8 ◽

2003 ◽

Vol 200 (1-4) ◽

pp. 171-194 ◽

Cited By ~ 22

Author(s):

S.E. Harrison ◽

S.D. Locker ◽

A.C. Hine ◽

J.H. Edwards ◽

D.F. Naar ◽

...

Keyword(s):

Inner Shelf ◽

Central Florida ◽

Sand Ridges ◽

West Central ◽

Mixed Carbonate

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Monitoring inner shelf sediment transport using fluorescent sand tracers: an example from the south coast of Portugal

10.5194/egusphere-egu21-15834 ◽

2021 ◽

Author(s):

João Cascalho ◽

Rui Taborda ◽

Marcos Rosa ◽

Erwan Garel ◽

Sebastião Teixeira ◽

...

Keyword(s):

Sediment Transport ◽

Tracer Experiment ◽

Current Data ◽

Automated Image Analysis ◽

South Coast ◽

Inner Shelf ◽

Shelf Sediment ◽

Ongoing Work ◽

Coated Sand

The continuous need for beach nourishment requires a detailed understanding of the sediment transport characteristics at the shelf borrow sites, to assess their recovery rate and to evaluate the long-term sustainability of these operations.&#160;The main objective of this work is to assess sediment transport conditions at an inner shelf borrow site exploited to nourish a beach located at the updrift boundary of the same sedimentary cell (Belharucas, Albufeira, south coast of Portugal).The work is supported by a sand tracer experiment, where 600 kg of coated sand with fluorescent ink was deposited (August 2020) by divers at 11 m depth (referred to the mean sea level). Periodic sediment sampling using a Van Veen grab was performed using an adaptative sampling grid that accounted for tracer&#8217;s dispersion trough time. The samples were washed and dried in laboratory and tagged particles were automatically identified using an automated image analysis procedure based on ultraviolet lighting.Preliminary results show that sediment transport is dominated by a eastward component,probably related with the energetic events from the SW. Ongoing work relates the tracer&#8217;s displacement with ADCP (wave and current) data measured nearby the borrow site during the experiment.&#160;The authors would like to acknowledge the financial support FCT through project UIDB/50019/2020 &#8211; IDL and ECOEXA project (MAR-01.04.02-FEAMP-0016).&#160;&#160;

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