Organic-walled microfossils in the Ediacaran of Estonia: Biodiversity on the East European Platform

Arvestål, Emma; Willman, Sebastian

doi:10.1016/j.precamres.2020.105626

Cited by 14 publications

(16 citation statements)

References 38 publications

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“…This pattern is observed on the Digermulen Peninsula where the lower Ediacaran Nyborg Formation contains acanthomorphs (Agić et al 2018), whereas the strata above in the Stáhpogieddi Formation are mostly barren and relatively depauperate until Cambrian time. OWM assemblages of low diversity, with few eukaryotic forms, have also been reported from Argentina, Australia, Brazil, East European Platform, Namibia and Siberia (Germs et al 1986;Gaucher et al 2003;Grey, 2005;Leonov & Ragozina, 2007;Chiglino et al 2015;Kolesnikov et al 2015;Ragozina et al 2016;Arrouy et al 2019;Arvestål & Willman, 2020). Late Ediacaran acanthomorphic acritarchs were found in Mongolia (Anderson et al 2019) and in a drillcore from Siberia (Grazhdankin et al 2020), but these occurrences are exceptions among the generally low-diversity late Ediacaran OWM assemblages.…”

Section: A Ediacaran Granomarginatamentioning

confidence: 92%

“…Organic-walled microfossil taxa characteristic of the early Ediacaran Period (ECAP/DPA), as well as organically preserved remnants of multicellular tissue, have been documented in the upper part of the Nyborg Formation (Agić et al 2018(Agić et al , 2019. Overlying the Mortensnes diamictite is the Stáhpogieddi Formation, which starts with sandstones and shales of the Lillevannet Member, representing a transgressive interval (Banks et al 1971;Jensen et al 2018b). Above lies the Indreelva Member composed of mudstones, siltstones and sandstones, which hosts an assemblage of Ediacara-type macrofossils dominated by discoidal taxa (Farmer et al 1992;Högström et al 2013Högström et al , 2017Jensen et al 2018b).…”

Section: A Arctic Norwaymentioning

confidence: 99%

“…The association could be representative of taxa occupying a specific type of environment. All strata in which this assemblage occurs (including the upper Ediacaran rocks bearing Granomarginata in India, Poland and Baltica; Prasad et al 2010;Jachowicz-Zdanowska, 2011;Arvestål & Willman, 2020), represent a marine shallowwater to marginal shelf environment. Leiosphaerids are usually highly abundant in nearshore, shallow-water environments (e.g.…”

Section: C Palaeoenvironmental Implicationsmentioning

confidence: 99%

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Late Ediacaran occurrences of the organic-walled microfossilsGranomarginataand flask-shapedLagoenaforma collarisgen. et sp. nov.

et al. 2021

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New occurrences of flask-shaped and envelope-bearing microfossils, including the predominantly Cambrian taxon Granomarginata, are reported from new localities, as well as from earlier in time (Ediacaran) than previously known. The stratigraphic range of Granomarginata extends into the Cambrian System, where it had a cosmopolitan distribution. This newly reported Ediacaran record includes areas from Norway (Baltica), Newfoundland (Avalonia) and Namibia (adjacent to the Kalahari Craton), and puts the oldest global occurrence of Granomarginata in the Indreelva Member (< 563 Ma) of the Stáhpogieddi Formation on the Digermulen Peninsula, Arctic Norway. Although Granomarginata is rare within the assemblage, these new occurrences together with previously reported occurrences from India and Poland, suggest a potentially widespread palaeogeographic distribution of Granomarginata through the middle–late Ediacaran interval. A new flask-shaped microfossil Lagoenaforma collaris gen. et sp. nov. is also reported in horizons containing Granomarginata from the Stáhpogieddi Formation in Norway and the Dabis Formation in Namibia, and flask-shaped fossils are also found in the Gibbett Hill Formation in Newfoundland. The Granomarginata–Lagoenaforma association, in addition to a low-diversity organic-walled microfossil assemblage, occurs in the strata postdating the Shuram carbon isotope excursion, and may eventually be of use in terminal Ediacaran biostratigraphy. These older occurrences of Granomarginata add to a growing record of body fossil taxa spanning the Ediacaran–Cambrian boundary.

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Section: A Ediacaran Granomarginatamentioning

confidence: 92%

Section: A Arctic Norwaymentioning

confidence: 99%

Section: C Palaeoenvironmental Implicationsmentioning

confidence: 99%

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Late Ediacaran occurrences of the organic-walled microfossilsGranomarginataand flask-shapedLagoenaforma collarisgen. et sp. nov.

et al. 2021

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“…Detrital zircon U-Pb ages have subsequently constrained the Visingsö Formation to a maximum depositional age of ≤886 ± 9 Ma (Moczydłowska et al 2017), and recent microfossil studies also suggest this formation was deposited during the Tonian (Loron & Moczydłowska, 2018). Klein et al (2015), however, point out that many of the form-taxa reported from the Hailuoto Formation by Tynni & Donner (1980) are actually found in much younger sediments elsewhere in the Baltic region and East European Platform, for example, in late Ediacaran strata from the Kotlin Formation of Estonia (Mens & Pirrus, 1997;Meidla, 2017;Arvestål & Willman, 2020;Slater et al 2020). A particularly close comparison can also be drawn with OWM assemblages from the late Ediacaran Redkino and Kotlin regional stages of the Lyamtsa, Verkhovka, Zimnie Gory and Yorga formations of the White Sea region in Russia (e.g.…”

Section: Geological Settingmentioning

confidence: 98%

“…The cells of the trichome are occasionally separated and displaced obliquely within the sheath, appearing as a series of discoidal cells (e.g. Arvestål & Willman, 2020). These filaments are distinguishable from other fossil multicellular trichomes such as Oscillatoriopsis from the manner in which specimens break (across pseudosepta vs between true cells in Oscillatoriopsis).…”

Section: B2 Palaeolyngbyamentioning

confidence: 99%

Late Ediacaran organic microfossils from Finland

Willman

Slater

2021

Geol. Mag.

Self Cite

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Here we present a detailed accounting of organic microfossils from late Ediacaran sediments of Finland, from the island of Hailuoto (northwest Finnish coast), and the Saarijärvi meteorite impact structure (~170 km northeast of Hailuoto, mainland Finland). Fossils were recovered from fine-grained thermally immature mudstones and siltstones and are preserved in exquisite detail. The majority of recovered forms are sourced from filamentous prokaryotic and protistan-grade organisms forming interwoven microbial mats. Flattened Nostoc-ball-like masses of bundled Siphonophycus filaments are abundant, alongside Rugosoopsis and Palaeolyngbya of probable cyanobacterial origin. Acritarchs include Chuaria, Leiosphaeridia, Symplassosphaeridium and Synsphaeridium. Significantly, rare spine-shaped sclerites of bilaterian origin were recovered, providing new evidence for a nascent bilaterian fauna in the terminal Ediacaran. These findings offer a direct body-fossil insight into Ediacaran mat-forming microbial communities, and demonstrate that alongside trace fossils, detection of a bilaterian fauna prior to the Cambrian might also be sought among the emerging record of small carbonaceous fossils (SCFs).

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Early eukaryotic microfossils of the late Palaeoproterozoic Limbunya Group, Birrindudu Basin, northern Australia

Riedman,

Porter,

Lechte

et al. 2023

Papers in Palaeontology

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Fine‐grained, siliciclastic units of the >1642 ± 3.9 Ma late Palaeoproterozoic Limbunya Group, Birrindudu Basin host rich, well‐preserved organic‐walled microfossil assemblages that include members of total‐group eukaryotes. These assemblages include taxa characteristic of this interval such as Tappania plana and Satka favosa, as well as less common taxa such as Gigantosphaeridium fibratum, Gigantosphaeridium floccosum, Kamolineata elongata (= Valeria elongata; new combination), and four new species. The new taxa include Limbunyasphaera operculata gen et sp. nov., the oldest known operculate taxon; the large septate filaments of Siphonoseptum bombycinum gen. et sp. nov.; the platy tubular form Birrindudutuba brigandinia gen. et sp. nov.; and Filinexum torsivum gen. et sp. nov., which bears a spirally twisted wall constructed of bound fibres. Our data show that eukaryotic fossils are particularly abundant in marginal marine environments such as tidal flats and back‐barrier lagoonal settings. This is exemplified by the Blue Hole Formation, which features an especially diverse and complex assemblage. We also present a new within‐formation eukaryotic species richness estimate for the Palaeoproterozoic to Tonian. This estimate indicates that the oldest eukaryote‐bearing units already show species richness levels similar to those of the much younger and more heavily sampled Tonian period. Additionally, these oldest eukaryotic assemblages show significant morphological disparity, particularly in vesicle construction. These high levels of eukaryotic species richness and morphological disparity suggest that although late Palaeoproterozoic units preserve our oldest record of eukaryotes, the eukaryotic clade has a much deeper history.

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Organic-walled microfossils in the Ediacaran of Estonia: Biodiversity on the East European Platform

Cited by 14 publications

References 38 publications

Late Ediacaran occurrences of the organic-walled microfossilsGranomarginataand flask-shapedLagoenaforma collarisgen. et sp. nov.

Late Ediacaran occurrences of the organic-walled microfossilsGranomarginataand flask-shapedLagoenaforma collarisgen. et sp. nov.

Late Ediacaran organic microfossils from Finland

Early eukaryotic microfossils of the late Palaeoproterozoic Limbunya Group, Birrindudu Basin, northern Australia

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