The late Ordovician Soom Shale Lagerstätte: an extraordinary post-glacial fossil and sedimentary record

Gabbott, Sarah E.; Browning, Claire; Theron, Johannes N.; Whittle, Rowan J.

doi:10.1144/jgs2016-076

Cited by 29 publications

(11 citation statements)

References 65 publications

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“…Indeed, early replacement of soft tissues by clay minerals has been implicated in the preservation of several important Proterozoic and Phanerozoic Lagerstätten (e.g. [44,45]). Our observations do not necessarily constrain the timing of clay replacement at Ferryland Head (see electronic supplementary material, note S3 for discussion).…”

Section: (C) Argillaceous Ribbons Interpreted As Fossil Biofilm Streamersmentioning

confidence: 99%

Late Ediacaran life on land: desiccated microbial mats and large biofilm streamers

et al. 2021

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The Ediacaran period witnessed transformational change across the Earth–life system, but life on land during this interval is poorly understood. Non-marine/transitional Ediacaran sediments preserve a variety of probable microbially induced sedimentary structures and fossil matgrounds, and the ecology, biogeochemistry and sedimentological impacts of the organisms responsible are now ripe for investigation. Here, we report well-preserved fossils from emergent siliciclastic depositional environments in the Ediacaran of Newfoundland, Canada. These include exquisite, mouldically preserved microbial mats with desiccation cracks and flip-overs, abundant Arumberia -type fossils and, most notably, assemblages of centimetre-to-metre-scale, subparallel, branching, overlapping, gently curving ribbon-like features preserved by aluminosilicate and phosphate minerals, with associated filamentous microfossils. We present morphological, petrographic and taphonomic evidence that the ribbons are best interpreted as fossilized current-induced biofilm streamers, the earliest record of an important mode of life (macroscopic streamer formation) for terrestrial microbial ecosystems today. Their presence shows that late Ediacaran terrestrial environments could produce substantial biomass, and supports recent interpretations of Arumberia as a current-influenced microbial mat fossil, which we here suggest existed on a ‘streamer–arumberiamorph spectrum’. Finally, the absence of classic Ediacaran macrobiota from these rocks despite evidently favourable conditions for soft tissue preservation upholds the consensus that those organisms were exclusively marine.

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Section: (C) Argillaceous Ribbons Interpreted As Fossil Biofilm Streamersmentioning

confidence: 99%

Late Ediacaran life on land: desiccated microbial mats and large biofilm streamers

et al. 2021

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“…Later, exceptionally-preserved fossils were recovered from the formation containing the inarticulates Palaeoglossa and Kosoides (Bassett et al, 2009) which are unknown in the Hirnantia Fauna. The Cedarberg Formation was reported to be late Hirnantian in age (Vandenbroucke et al, 2009;Gabbott et al, 2017) and thus South Africa is excluded from the Bani J o u r n a l P r e -p r o o f Journal Pre-proof Fauna and the Cathay Fauna (Fig. 14).…”

Section: Journal Pre-proofmentioning

confidence: 99%

The latest Ordovician Hirnantian brachiopod faunas: New global insights

Jiayu

Harper

Huang

et al. 2020

Earth-Science Reviews

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“…2011; Gabbott et al . 2016). These gaps in the nektaspid fossil record predict additional unsampled diversity in suitable Ordovician and Cambrian facies.…”

Section: Discussionmentioning

confidence: 99%

Phylogenetic response of naraoiid arthropods to early–middle Cambrian environmental change

Bond

Edgecombe

2020

Palaeontology

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The Cambrian Period, primarily known for animal life diversifying, experienced global extinctions. Pulses of extinction in Cambrian Series 2 are exemplified by the disappearance of archaeocyath sponges and olenelline and redlichiid trilobites. However, the effect of such extinctions on outer shelf organisms, as typify Burgess Shale‐type (BST) deposits, remains relatively unknown. The phylogeny of naraoiid arthropods, represented in BST deposits globally, has consequently been reconstructed from either side of the Series 2 – Miaolingian extinction event to evaluate the response of offshore marine organisms to Cambrian environmental perturbation. As soft anatomy is known for only a subset of naraoiid species, exoskeletal morphology has proven important. Misszhouia and Naraoia (Naraoia) are distinguished morphometrically by posterior shield length/width and anterior shield length/posterior shield length. Morphometry has also been used to strengthen the identification of some cryptic naraoiid species and revise stratigraphic ranges. A revised naraoiid phylogeny reveals Misszhouia as a monophyletic subgenus, the former genus Pseudonaraoia nests within Naraoia and is placed in synonymy, and the systematic position and status of the Subfamily Liwiinae are sensitive to character weighting. Ten species of Naraoiidae range across the Series 2 – Miaolingian boundary, all naraoiid lineages originating during the main BST window. The persistence of outer shelf naraoiids throughout the Series 2 extinctions suggests that deeper offshore marine environments were resilient to extinction during periods of environmental stress. This study provides novel empirical support for the asylum of BST communities, which may contribute to the taxonomic longevity and widespread geographic distribution of taxa in these biotas.

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The late Ordovician Soom Shale Lagerstätte: an extraordinary post-glacial fossil and sedimentary record

Cited by 29 publications

References 65 publications

Late Ediacaran life on land: desiccated microbial mats and large biofilm streamers

Late Ediacaran life on land: desiccated microbial mats and large biofilm streamers

The latest Ordovician Hirnantian brachiopod faunas: New global insights

Phylogenetic response of naraoiid arthropods to early–middle Cambrian environmental change

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