Taphonomy and morphology of the Ediacara form genus Aspidella

Tarhan, Lidya G.; Droser, Mary L.; Gehlîng, James G.; Dzaugis, Matthew P.

doi:10.1016/j.precamres.2014.11.026

Cited by 70 publications

(79 citation statements)

References 34 publications

(6 reference statements)

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“…According to their single peripheral rim, without ornamentation, elliptical fossils from Saint‐Gonlay clearly differ from typical Ediacaran discoid fossils such as Aspidella , Cyclomedusa, Marsonia and Medusinites which show strong concentric lines or radial structures (Wade ; McCall ; McGabhann ; Kumar & Ahmad ; Tarhan et al . ) or other various discoid and concentric megascopic fossils such as the ones discovered in the Precambrian of Canada (Burzynski & Narbonne ) or China (Zhang et al . ).…”

Section: Discussionmentioning

confidence: 99%

“…According to their single peripheral rim, without ornamentation, elliptical fossils from Saint-Gonlay clearly differ from typical Ediacaran discoid fossils such as Aspidella, Cyclomedusa, Marsonia and Medusinites which show strong concentric lines or radial structures (Wade 1972;McCall 2006;McGabhann 2007;Kumar & Ahmad 2012;Tarhan et al 2015) or other various discoid and concentric megascopic fossils such as the ones discovered in the Precambrian of Canada (Burzynski & Narbonne 2015) or China (Zhang et al 2006). The low thickness and the peripheral bulge argue against an affinity with the circular Intrites punctatus from the Neoproterozoic in the U.K., where the central deep depression is lacking (McIlroy et al 2005;Liu 2011).…”

Section: Discussionmentioning

confidence: 99%

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First evidence of Ediacaran–Fortunian elliptical body fossils in the Brioverian series of Brittany, NW France

Néraudeau

Dabard

Albani

et al. 2018

LET

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Body fossils are described for the first time from the Upper Brioverian (Ediacaran–Fortunian) deposits of Central Brittany (NW France). The material consists of a dozen of specimens preserved on two slates, recently collected in a quarry in Saint‐Gonlay. The fossils, centimetric in size, have an elliptical and acuminated outline, with a peripheral bulge but without conspicuous concentric or radial lines. These body fossils are preserved in slates that are locally rich in grazing traces, sometimes associated with microbial mats. The sedimentological characteristics of these deposits correspond to a shallow marine shelf environment, with a low to moderate hydrodynamism. Such findings, in concomitance with previous ichnological discoveries, unravel the potential of the Brioverian strata from Brittany as a new locality to provide answers on Ediacaran and early Cambrian biocenoses.

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Section: Discussionmentioning

confidence: 99%

Section: Discussionmentioning

confidence: 99%

First evidence of Ediacaran–Fortunian elliptical body fossils in the Brioverian series of Brittany, NW France

Néraudeau

Dabard

Albani

et al. 2018

LET

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“…At the base of each parasequence, the Flat‐Laminated to Linguoid‐Rippled Sandstone Facies (formerly described as the Delta‐Front Sandstone Facies; cf. Gehling & Droser, ) consists of fining‐ and thinning‐upward sets of poorly sorted, laminated, red silty sandstone beds, along which linguoid ripples and tool marks occur, with fossils occurring primarily in hyporelief as external and entrained composite molds, and occasionally in epirelief (Droser et al., ; Tarhan, Droser, Gehling, & Dzaugis, ). The Oscillation‐Rippled Sandstone Facies (formerly described as the Wave‐Base Sandstone Facies; cf.…”

Section: Geologic Setting and Sample Descriptionmentioning

confidence: 99%

The late‐stage “ferruginization” of the Ediacara Member (Rawnsley Quartzite, South Australia): Insights from uranium isotopes

et al. 2017

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The paleoenvironmental setting in which the Ediacara Biota lived, died, and was pre- U values, consistent with a groundwater U source. These U isotope data thus corroborate sedimentological observations that ferric oxides along fossiliferous surfaces of the Ediacara Member consist of surficial, non-bedform-parallel staining, and sharply irregular patches, strongly reflecting post-depositional, late-stage processes.Therefore, both sedimentological and geochemical evidence indicate that Ediacara iron oxides do not reflect synsedimentary ferruginization and that the presence of iron oxides cannot be used to either invoke a terrestrial paleoenvironmental setting for or reconstruct the taphonomic pathways responsible for preservation of the EdiacaraBiota. These findings demonstrate that careful assessment of paleoenvironmental parameters is essential to the reconstruction of the habitat of the Ediacara Biota and the factors that led to the fossilization of these early complex ecosystems.

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“…The only broadly accepted evidence of motility and associated behaviours in the Ediacara biota is represented by trace fossils from Canada, China, Namibia, Russia, and South Australia23456. Previous attempts to compare Ediacara disc-shaped fossils (e.g., Aspidella ) with free-swimming medusoids have been discounted in light of evidence that these were either attachment discs for frond-like organisms7 or a motile, benthic animal of cnidarian grade8. Serial imprints left by flat organisms such as Dickinsonia and Yorgia have been previously interpreted as multiple decayed organisms or touch-down impressions made by current-shuffled individuals, but they are likely evidence of periodic creeping to feed via adsorption of mat nutrients910111213.…”

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Rheotaxis in the Ediacaran epibenthic organism Parvancorina from South Australia

Paterson

Gehlîng

Droser

et al. 2017

Sci Rep

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Diverse interpretations of Ediacaran organisms arise not only from their enigmatic body plans, but also from confusion surrounding the sedimentary environments they inhabited and the processes responsible for their preservation. Excavation of Ediacaran bedding surfaces of the Rawnsley Quartzite in South Australia has provided the opportunity to study the community structure of the Ediacara biota, as well as the autecology of individual organisms. Analysis of two bedding surfaces preserving large numbers of Parvancorina illustrates that individuals display a preferred, unidirectional orientation aligned with current, as indicated by the identified current proxies: tool marks, overfolded edges of Dickinsonia, felled fronds and drag structures generated by uprooted frond holdfasts. Taphonomic and morphological evidence suggests that the preferred orientations of Parvancorina individuals are not the result of passive current alignment, but represent a rheotactic response at some stage during their life cycle. These results illustrate a previously unrecognized life mode for an Ediacaran organism and arguably the oldest known example of rheotaxis in the fossil record. The morphology and previously suggested phylogenetic affinities of Parvancorina are also re-evaluated. Apart from possessing a bilaterally symmetrical body, there are no unequivocal morphological characters to support placement of Parvancorina within the Euarthropoda or even the Bilateria.

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Taphonomy and morphology of the Ediacara form genus Aspidella

Cited by 70 publications

References 34 publications

First evidence of Ediacaran–Fortunian elliptical body fossils in the Brioverian series of Brittany, NW France

First evidence of Ediacaran–Fortunian elliptical body fossils in the Brioverian series of Brittany, NW France

The late‐stage “ferruginization” of the Ediacara Member (Rawnsley Quartzite, South Australia): Insights from uranium isotopes

Rheotaxis in the Ediacaran epibenthic organism Parvancorina from South Australia

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