The oldest record of Ediacaran macrofossils in Gondwana (~563 Ma, Itajaí Basin, Brazil)

Becker-Kerber, Bruno; Paim, Paulo Sérgio Gomes; Chemale, Farid; Girelli, Tiago Jonatan; Rosa, Ana Lúcia Zucatti da; Albani, Abderrazak El; Osés, Gabriel Ladeira; Prado, Gustavo; Figueiredo, Milene Freitas; Simões, Luiz Sérgio Amarante; Pacheco, Mírian Liza Alves Forancelli

doi:10.1016/j.gr.2020.03.007

Cited by 21 publications

(16 citation statements)

References 71 publications

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“…The Itajaí biota is composed of the well-known chambered taxon Palaeopascichnus , the discoidal forms Aspidella and Nimbia , and micron-sized algal or bacterial filaments 13 (Fig. 1 c–f).…”

Section: Resultsmentioning

confidence: 99%

“…This geological unit is relatively unmetamorphosed, has similar ages to the Avalon Assemblage, and also possesses high-fidelity preservation of the fossils. Recently, Becker-Kerber et al 13 described the Itajaí biota, reporting the presence of Palaeopascichnus , discoidal forms, micrometric filaments, Arumberia and fossilized microbial tufts. In this work, we apply a diverse array of techniques to address the fossilization processes of this new Ediacaran locality.…”

Section: Introductionmentioning

confidence: 99%

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The role of volcanic-derived clays in the preservation of Ediacaran biota from the Itajaí Basin (ca. 563 Ma, Brazil)

Becker-Kerber

Albani

Konhauser

et al. 2021

Sci Rep

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The early evolution of metazoans has been reconstructed by studies on exceptionally preserved molds in siliciclastic rocks from the Ediacaran Period. However, there remains considerable controversy regarding the formation mechanisms of this unusual ‘Ediacaran-style’ preservation. Proposed hypotheses usually include early authigenesis of minerals, but evidence for this is scarce. In a recently discovered deposit of Ediacaran biota in Brazil, we show that the classic moldic preservation is related to clay mineral authigenesis. Specifically, these clays originated from the alteration of original pyroclastic sediments, likely enhanced by microbial activity, leading to early illitization and morphological templating of the fossiliferous surfaces at a micrometric scale. Such high-fidelity preservation was made possible by rapid burial during volcanic events and the in-situ templating of tissue by clays via microbially-mediated mineralization. This newly described Lagerstätte demonstrates that a number of minerals can facilitate preservation, and that perhaps ‘Ediacaran-style’ preservation result from different processes leading to the same broad style of preservation.

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Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

The role of volcanic-derived clays in the preservation of Ediacaran biota from the Itajaí Basin (ca. 563 Ma, Brazil)

Becker-Kerber

Albani

Konhauser

et al. 2021

Sci Rep

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“…2018), the Yudoma Group of Siberia (Ivantsov 2017), the Itajaí Basin of Brazil (Becker‐Kerber et al . 2020) and South Australia (Glaessner 1969; Haines 2000). In Newfoundland, it also frequently occurs in marine slope deposits of the (~560 Ma) Fermeuse Formation at Ferryland (Gehling et al .…”

Section: Discussionmentioning

confidence: 99%

Ediacaran macrofossils prior to the ~580 Ma Gaskiers glaciation in Newfoundland, Canada

Liu

Tindal

2021

LET

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Macrofossils of the inferred protist‐grade organism Palaeopascichnus linearis occur stratigraphically beneath glacial diamictites of the ~580 Ma, Gaskiers‐equivalent, Trinity ‘facies’ of the Rocky Harbour Formation on the Bonavista Peninsula of Newfoundland, Canada. These fossils significantly pre‐date previously reported macrofossils from Avalonia and extend the taphonomic window for moldic preservation of macroscopic organisms beyond the Gaskiers glacial event into the middle Ediacaran Period. This finding confirms the long stratigraphical range of palaeopascichnid fossils worldwide and informs discussions surrounding both the age of poorly time‐constrained stratigraphical units in Norway and Australia, and formal sub‐division of the Ediacaran System.

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“…The fossils were recovered from an outcrop located at a vicinal road between Apiúna and Subida municipalities. This section belongs to the Depositional Sequence 2 (DS2) of the IB (electronic supplementary material, figures S1 and S2; see further details in [25]). The DS2 is represented by a relatively deep-marine succession recording a lowstand systems tract [25].…”

Section: Occurrence Morphology and Ecologymentioning

confidence: 99%

“…This section belongs to the Depositional Sequence 2 (DS2) of the IB (electronic supplementary material, figures S1 and S2; see further details in [25]). The DS2 is represented by a relatively deep-marine succession recording a lowstand systems tract [25]. It is mostly composed of high-density, channelized to unconfined turbidites and fine-grained, slope to basinal facies.…”

Section: Occurrence Morphology and Ecologymentioning

confidence: 99%

In situfilamentous communities from the Ediacaran (approx. 563 Ma) of Brazil

et al. 2021

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Precambrian filamentous microfossils are common and diverse. Nevertheless, their taxonomic assignment can be difficult owing to their overall simple shapes typically lacking in diagnostic features. Here, we report in situ communities of well-preserved, large filamentous impressions from the Ediacaran Itajaí Basin ( ca 563 Ma) of Brazil. The filaments are uniserial (unbranched) and can reach up to 200 µm in width and up to 44 mm in length. They occur as both densely packed or sparsely populated surfaces, and typically show a consistent orientation. Although simple in shape, their preferred orientation suggests they were tethered to the seafloor, and their overall flexibility (e.g. bent, folded and twisted) supports a biological (rather than sedimentary) affinity. Biometric comparisons with modern filamentous groups further support their biological affinity, suggesting links with either large sulfide-oxidizing bacteria (SOB) or eukaryotes. Other morphological and palaeoecological characteristics further corroborates their similarities with modern large filamentous SOB. Their widespread occurrence and association with complex Ediacaran macrobiota (e.g. frondose organisms, Palaeopascichnus ) suggest that they probably played an important role in the ecological dynamics of these early benthic communities by providing firm substrates for metazoans to inhabit. It is further hypothesized that the dynamic redox condition in the latest Ediacaran, with the non-continuous rise in oxygen concentration and periods of hypoxia, may have created ideal conditions for SOB to thrive.

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The oldest record of Ediacaran macrofossils in Gondwana (~563 Ma, Itajaí Basin, Brazil)

Cited by 21 publications

References 71 publications

The role of volcanic-derived clays in the preservation of Ediacaran biota from the Itajaí Basin (ca. 563 Ma, Brazil)

The role of volcanic-derived clays in the preservation of Ediacaran biota from the Itajaí Basin (ca. 563 Ma, Brazil)

Ediacaran macrofossils prior to the ~580 Ma Gaskiers glaciation in Newfoundland, Canada

In situfilamentous communities from the Ediacaran (approx. 563 Ma) of Brazil

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