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71 results for “Ediacaran”
Data from: Transgression-regression cycles drive correlations in Ediacaran-Cambrian rock and fossil records
<p>Strata of the Ediacaran Period (635-538.8 Ma) yield the oldest known fossils of complex, macroscopic organisms in the geologic record. These "Ediacaran-type" macrofossils (known as the Ediacaran biota) first appear in mid-Ediacaran strata, experience an apparent decline through the terminal Ediacaran, and directly precede the Cambrian (538.8-485.4 Ma) radiation of animals. Existing hypotheses for the origin and demise of the Ediacaran biota include: changing oceanic redox states, biotic replacement by succeeding Cambrian-type fauna, and mass extinction driven by environmental change. Few studies frame trends in Ediacaran and Cambrian macroevolution from the perspective of the sedimentary rock record, despite well-documented Phanerozoic covariation of macroevolutionary patterns and sedimentary rock quantity. Here we present a quantitative analysis of North American Ediacaran–Cambrian rock and fossil records from Macrostrat and the Paleobiology Database. Marine sedimentary rock quantity increases nearly monotonically and by over a factor of five from the latest Ediacaran to the late Cambrian. Ediacaran–Cambrian fossil quantities exhibit a comparable trajectory and have strong (r<sub>s</sub> > 0.8) positive correlations with marine sedimentary area and volume flux at multiple temporal resolutions. Even so, Ediacaran fossil quantities are dramatically reduced in comparison to the Cambrian when normalized by the quantity of preserved marine rock. Although aspects of these results are consistent with the expectations of a simple fossil-preservation induced sampling bias, together they suggest that transgression-regression and a large expansion of marine shelf environments coincided with the diversification of animals during a dramatic transition that is starkly evident in both the sedimentary rock and fossil records.</p>
Data from: Elucidating the morphology and ecology of Eoandromeda octobrachiata from the Ediacaran of South Australia
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Data from: Species of Dickinsonia Sprigg from the Ediacaran of South Australia
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Data from: Recolonisation strategies of early animals in the Avalon (Ediacaran 574 – 560 Ma)
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Data for: Frond orientations with independent current indicators demonstrate the reclining rheotropic mode of life of several Ediacaran rangeomorph taxa
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Data from: Transgression-regression cycles drive correlations in Ediacaran-Cambrian rock and fossil records
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Ediacaran metazoan fossils with siliceous skeletons from the Digermulen Peninsula of Arctic Norway – Supplementary Data
<p><span>In this study, a new assemblage of Ediacaran metazoan fossils is reported from the basal Stáhpogieddi Formation on the Digermulen Peninsula of Arctic Norway, including <i>Anulitubus</i> n. gen. Moczydłowska in Moczydłowska et al., <i>Anulitubus formosus</i> n. gen. n. sp. Moczydłowska in Moczydłowska et al., <i>Coniculus</i> n. gen. Moczydłowska in Moczydłowska et al., <i>Coniculus elegantis</i> n. gen. n. sp. Moczydłowska in Moczydłowska et al., <i>Fistula</i> n. gen. Moczydłowska in Moczydłowska et al., <i>Fistula crenulata</i> n. gen. n. sp. Moczydłowska in Moczydłowska et al. The specimens are three-dimensionally preserved and include tubular and conical skeletons that are morphologically distinguished by their body wall constructions, radial symmetry, polarity, segmentation, and annulation. The skeletons are interpreted to be biomineralized by primary silica based on computed micro-tomographic, petrographic, geochemical and spectroscopic evidence of originally rigid body wall with layers of constant thicknesses, composed of opal, microcrystalline quartz and admixture of carbonaceous material, which differ from the host sediment mineralogy and do not show replacement or encrustation. The fossil-bearing interval immediately overlies strata of Gaskiers age and can be bracketed within 580–541 Ma, but it is estimated to be ~575 Ma on the basis of averaged sedimentation rates and biostratigraphic correlations with Ediacaran biota found in up-section deposits of ~558–555 Ma. Future new findings of such fossils in different preservation modes and further multi-collector inductively coupled plasma mass spectrometry, which shows the silicon fractionation and trace its biogenic origin vs inorganic mineralization, may corroborate the interpretation of biogenic silicification of these earliest skeletal fossils.</span></p>
Data set from Ediacaran Mirassol d´Oeste Formation
<p>These data are from geochemical analysis from the Paleoenvironmental evolution of the Ediacaran Mirassol d´Oeste Formation, Araras-Alto Paraguai Basin, central part of Brazil. These results are submitted to Global and Planetary Change.</p>
Ediacaran marine animal forests and the ventilation of the oceans
<p>This dataset consists of original data from the following paper:</p> <p>Gutarra, S., Mitchell, E.G., Dunn, F.S., Gibson, B.M., Racicot, R.A., Darroch, S.A.F. and Rahman, I.A. 2024. Ediacaran marine animal forests and the ventilation of the oceans. <em>Current Biology</em> 34, 2528–2534. <a href="https://doi.org/10.1016/j.cub.2024.04.059">doi:10.1016/j.cub.2024.04.059</a></p> <p>The dataset comprises two ZIP files: </p> <p>Gutarra_et_al_Simulated_Communities.zip. This file includes spreadsheets (.xlsx) and text files (.txt) with details of the virtual communities simulated based on data on the size, density, spatial distribution, and orientation of Ediacaran fossils from the ‘D’, ‘E’, and Lower Mistaken Point (LMP) surfaces at Mistaken Point, Newfoundland, Canada. Virtual communities were simulated using the package spatstat in R.</p> <p>Gutarra_et_al_CFD_Simulations.zip. This file includes three-dimensional digital models (.stp) of the simulated communities and results files (.mph) from computational fluid dynamics (CFD) simulations of water flow using these models. Digital models were built in Rhinoceros 3D and CFD simulations were performed in COMSOL Multiphysics.</p> <p>The code used for spatial ecological modelling is available at: https://github.com/egmitchell/SpatialSimulations</p> <p> </p>
DEM data for Functional morphology of the Ediacaran organism Tribrachidium heraldicum
<p>This is the dataset for DEM particles from CFD-DEM simulations for tribrachidium.</p>
Equatorial dipole: the ghost derailing the Ediacaran geomagnetic field
<p>These documents are all paleomagnetic data for a manuscript submitted to Geophysical Research Letters entitled "Equatorial dipole: the ghost derailing the Ediacaran geomagnetic field" by Zhong et al.</p>
Fig. 1 in New evidence on the taphonomic context of the Ediacaran Pteridinium
Fig. 1. Location of the Kuibis and Schwarzrand Subgroups in Namibia.
First identification of the Ediacaran Yukengou Formation in western Kuruktag, northeastern Tarim and its implications for the Neoproterozoic rift basin evolution
<p>This supporting information provides three supplemental tables containing the sandstone composition counting and zircon U-Pb dating results.</p>
Raman spectra and SEM EDX analyses of artifacts resembling Ediacaran / Cambrian fossils
<p>This data is related to the paper: "Artifacts resembling Ediacaran / Cambrian fossils: how to identify them and avoid their generation" submitted for publication in the "Journal of Micropaleontology" on March 24, 2023.</p> <p>The reaction between hydrogen peroxide and pyrite can lead to the generation of objects very similar to Ediacaran and Cambrian fossils, such as <em>Cloudina</em>. This dataset and related paper provides criteria to distinguish artifacts from fossils based on their composition and structure. This dataset cotains all the Raman spectra and SEM/EDX analyses of artifacts that characterize them and are used for discussion in the related paper.</p>
Supplemental dataset 1 for: Ediacaran palaeobiology and biostratigraphy of the Nama Group, Namibia, with emphasis on the erniettomorphs, tubular and trace fossils, and a new sponge, Arimasia germsi gen. et sp. nov.
<p class="MsoNormal">Ediacaran fossils, obtained in stratigraphic context in 1993, 1995 and 1996, with the assistance of A. Seilacher, IGCP project 320 scientists and the Geological Survey of Namibia, are described for the first time. Most are from the Kliphoek and Buchholzbrunn members of the Dabis Formation and the Huns and Spitskop members of the Urusis Formation, Witputs subbasin, but a significant number, including <em>Pteridinium</em>, are from the Kliphoek Member, Zaris Formation and the Neiderhagen Member, Nudaus Formation north of the Osis arch, which separates the two subbasins. We extend the stratigraphic ranges and geographic distributions of several important taxa, including <em>Archaeichnium</em>, <em>Ernietta</em>, <em>Pteridinium</em> and <em>Swartpuntia</em>, provide reassessments of the paleobiology of these and other organisms, and describe a new sponge—possibly an unmineralized archaeocyath—<em>Arimasia germsi</em> gen. et sp. nov. We also describe and illustrate various ichnofossils, including the oldest known traces from the Nama Group, narrow down the first appearance of <em>Treptichnus</em> in the Nama succession, and reinforce the idea that there was a prolific infauna of micrometazoans during the latest Ediacaran by naming and describing previously reported microburrows found on the surfaces of gutter casts as <em>Ariichnus vagus</em> igen. et isp. nov.</p>
Ediacaran metazoan fossils with siliceous skeletons from the Digermulen Peninsula of Arctic Norway – Supplementary Data
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Functional morphology of the Ediacaran organism Tribrachidium heraldicum
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Tulaneia amabilia, a new erniettomorph from the Wood Canyon Formation, Nevada and the age of the Ediacaran-Cambrian transition in the Great Basin
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Supplemental dataset 1 for: Ediacaran palaeobiology and biostratigraphy of the Nama Group, Namibia, with emphasis on the erniettomorphs, tubular and trace fossils, and a new sponge, Arimasia germsi gen. et sp. nov.
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Supplementary data for: Hydrodynamic insights into the palaeobiology of the Ediacaran rangeomorph Fractofusus misrai
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