scholarly journals Digital re‐evaluation of down‐dip channel‐fill architecture in deep‐water slope deposits: multi‐scale perspectives from UAV‐SfM

2021 ◽  
Author(s):  
Paul R. Nesbit ◽  
Stephen M. Hubbard ◽  
Benjamin G. Daniels ◽  
Daniel Bell ◽  
Rebecca G. Englert ◽  
...  
Keyword(s):  
Deep Water ◽  
Multi Scale ◽  
Slope Deposits

Deep-Water Ediacaran Fossils from Northwestern Canada: Taphonomy, Ecology, and Evolution

2014 ◽  
Vol 88 (2) ◽  
pp. 207-223 ◽  
Author(s):  
Guy M. Narbonne ◽  
Marc Laflamme ◽  
Peter W. Trusler ◽  
Robert W. Dalrymple ◽  
Carolyn Greentree
Keyword(s):  
Shallow Water ◽  
Deep Water ◽  
Evolutionary Origins ◽  
Ediacara Biota ◽  
Slope Deposits ◽  
Mackenzie Mountains ◽  
Fossil Data

Impressions of soft-bodied Ediacaran megafossils are common in deep-water slope deposits of the June beds at Sekwi Brook in the Mackenzie Mountains of NW Canada. Two taphonomic assemblages can be recognized. Soles of turbidite beds contain numerous impressions of simple (Aspidella) and tentaculate (Hiemalora, Eoporpita) discs. A specimen of the frond Primocandelabrum is attached to an Aspidella-like holdfast, but most holdfast discs lack any impressions of the leafy fronds to which they were attached, reflecting Fermeuse-style preservation of the basal level of the community. Epifaunal fronds (Beothukis, Charnia, Charniodiscus) and benthic recliners (Fractofusus) were most commonly preserved intrastratally on horizontal parting surfaces within turbidite and contourite beds, reflecting a deep-water example of Nama-style preservation of higher levels in the community. A well-preserved specimen of Namalia significantly extends the known age and environmental range of erniettomorphs into deep-water aphotic settings. Infaunal bilaterian burrows are absent from the June beds despite favorable beds for their preservation. The June beds assemblage is broadly similar in age and environment to deep-water Avalonian assemblages in Newfoundland and England, and like them contains mainly rangeomorph and arboreomorph fossils and apparently lacks dickinsoniomorphs and other clades typical of younger and shallower Ediacaran assemblages. Fossil data presently available imply that the classically deep- and shallow-water taxa of the Ediacara biota had different evolutionary origins and histories, with sessile rangeomorphs and arboreomorphs appearing in deep-water settings approximately 580 million years ago and spreading into shallow-water settings by 555 Ma but dickinsoniomorphs and other iconic clades restricted to shallow-water settings from their first known appearance at 555 Ma until their disappearance prior to the end of the Ediacaran.

scholarly journals Cambrian - Lower Silurian stratigraphy in the fold and thrust zone between northern Nyeboe Land and J. P. Koch Fjord, North Greenland

1987 ◽  
Vol 133 ◽  
pp. 91-98
Author(s):  
N.C Davis ◽  
A.K Higgins
Keyword(s):  
Deep Water ◽  
Outer Shelf ◽  
Shallow Marine ◽  
Lower Silurian ◽  
Slope Deposits ◽  
Thrust Zone ◽  
North Greenland

Brief description is given of observations on the Cambrian - Lower Silurian outer shelf and slope deposits of central and western North Greenland. A provisional correlation is proposed between various units of the shallow marine Buen Formation and units of the deep-water Polkorridoren Group.

A multi-scale approach to improve reservoir characterization and forecasting: the Albacora Field (deep-water offshore Brazil) study

2001 ◽  
Vol 7 (S) ◽  
pp. S17-S23 ◽  
Author(s):  
Luciane B. Cunha ◽  
Alberto da S. Barroso ◽  
Régis K. Romeu ◽  
Cristiano L. Sombra ◽  
Marcella M. Cortez ◽  
...  
Keyword(s):  
Deep Water ◽  
Reservoir Characterization ◽  
Multi Scale

Benthic foraminiferal zonation in deep-water carbonate platform margin environments, northern Little Bahama Bank

1988 ◽  
Vol 62 (01) ◽  
pp. 1-8 ◽  
Author(s):  
Ronald E. Martin
Keyword(s):  
Deep Water ◽  
Benthic Foraminifera ◽  
Carbonate Platform ◽  
Sedimentary Facies ◽  
Depositional Environments ◽  
Near Surface ◽  
Sediment Gravity Flows ◽  
Gravity Flows ◽  
Platform Margin ◽  
Water Carbonate

The utility of benthic foraminifera in bathymetric interpretation of clastic depositional environments is well established. In contrast, bathymetric distribution of benthic foraminifera in deep-water carbonate environments has been largely neglected. Approximately 260 species and morphotypes of benthic foraminifera were identified from 12 piston core tops and grab samples collected along two traverses 25 km apart across the northern windward margin of Little Bahama Bank at depths of 275-1,135 m. Certain species and operational taxonomic groups of benthic foraminifera correspond to major near-surface sedimentary facies of the windward margin of Little Bahama Bank and serve as reliable depth indicators. Globocassidulina subglobosa, Cibicides rugosus, and Cibicides wuellerstorfi are all reliable depth indicators, being most abundant at depths >1,000 m, and are found in lower slope periplatform aprons, which are primarily comprised of sediment gravity flows. Reef-dwelling peneroplids and soritids (suborder Miliolina) and rotaliines (suborder Rotaliina) are most abundant at depths <300 m, reflecting downslope bottom transport in proximity to bank-margin reefs. Small miliolines, rosalinids, and discorbids are abundant in periplatform ooze at depths <300 m and are winnowed from the carbonate platform. Increased variation in assemblage diversity below 900 m reflects mixing of shallow- and deep-water species by sediment gravity flows.

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