Organic walled microfossils from the Neoproterozoic Owk Shale, Kurnool Group, South India

Shukla, Yogmaya; Шарма, Мукунд; Сергеев, В. Н.

doi:10.1016/j.palwor.2019.08.002

Cited by 7 publications

(2 citation statements)

References 68 publications

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“…Such clusters have been reported from Precambrian rocks (e.g. Babu et al 2014; Riedman et al 2014; Shukla et al 2020) as well as from Phanerozoic strata (e.g. Eisenack 1965; Slater et al 2017; Machado et al 2020) and are known from numerous stratigraphical levels in many areas of the world.…”

Section: Discussionmentioning

confidence: 72%

Acritarch clusters from the Cambrian (Miaolingian) of the Příbram-Jince Basin, Czech Republic

2022

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Monogeneric clusters of five acritarch genera (Adara, Cymatiosphaera, Eliasum, Synsphaeridium and Timofeevia) were discovered in palynological residues obtained from fine-grained siliciclastic samples from the middle Cambrian (Miaolingian) Jince Formation of the P r ıbram-Jince Basin (Czech Republic). The clusters consist of two to more than 100 individual specimens and lack a common pattern of organisation. Acritarchs within clusters fall within a similar size range, regardless of generic affinity. Proposed mechanisms for the formation of these acritarch clusters are discussed: for the Jince Formation clusters, aggregation within algal blooms or primary colonial behaviour are the most plausible explanations. In addition, a summary of reports of acritarch clusters from lower Palaeozoic strata is included: clusters of a variety of acritarch genera have been documented from rocks of early Cambrian to Late Devonian age.

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Section: Discussionmentioning

confidence: 72%

Acritarch clusters from the Cambrian (Miaolingian) of the Příbram-Jince Basin, Czech Republic

2022

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“…Occurrence and stratigraphical range. Cosmopolitan and long-ranging, from the Mesoproterozoic to the Palaeozoic, including: Mesoproterozoic of Russia (Vorob'eva et al 2015) and Canada (Loron et al 2021); Meso-Neoproterozoic of Canada (Hofmann and Jackson 1994), Mauritania (Beghin et al 2017), the Democratic Republic of Congo (Baludikay et al 2016) and India (Srivastava and Kumar 2003); Neoproterozoic of Russia (Hermann 1974;Timofeev et al 1976;Jankauskas et al 1989;Mendelson and Schopf 1992;Veis et al 2006;Golubkova et al 2015), Svalbard (Knoll et al 1991), India (Tang et al 2017;Shukla et al 2020) and China (Tang et al 2013); Tonian of China (Tang et al 2015;Li et al 2019); Ediacaran of India (Joshi and Tiwari 2016), China (Xiao 2004), Estonia (Arvestål and Willman 2020) and Poland (Moczydłowska 2008); lower Cambrian of the Czech Republic (Fatka and Konzalová 1995;Steiner and Fatka 1996); Terreneuvian of Estonia (Slater et al 2018b) 5). In the recovered assemblage, P. velata tends to exhibit finer-scale wrinkles that are only rarely oriented radially (Plate 4, figure 2), and transitional forms between P. velata and P. solida are relatively rare (Plate 4, figures 3, 5).…”

Section: Genusmentioning

confidence: 99%

Organic-walled microfossils from the lower Cambrian of North Greenland: a reappraisal of diversity

Wallet,

Slater,

Willman

2023

Palynology

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The early Cambrian Buen Formation (North Greenland) hosts an exceptionally rich fossil biota that has contributed significantly to our knowledge of early metazoans, yet the fossil remains of primary producers from this deposit have received less attention. Here we examine the palynological component of the Buen Formation, with a focus on acritarchs and filamentous microfossils. Our analysis revealed the presence of 49 form taxa, 15 of which are described for the first time in the Buen Formation. These include large elements of presumably benthic origin, together with cyst-like acritarchs. Comasphaeridium longispinosum Vidal 1993 is renamed Comasphaeridium? brillesensis nom. nov., and Comasphaeridium densispinosum Vidal 1993 is reassigned to a new genus, Pearisphaeridium, becoming Pearisphaeridium densispinosum comb. nov. The diagnoses of Pearisphaeridium densispinosum (Vidal 1993) comb. nov. and Skiagia pura Moczydłowska 1988 are emended. Further, careful analysis of disparity in the recovered assemblage has revealed the presence of numerous transitional morphologies among the recorded acritarch form taxa. Though some of these transitional forms likely represent biologically meaningful entities (e.g. life cycle stages, ecophenotypes), others appear to have been artificially generated by taphonomic processes. Accounting for taphonomic factors and other sources of morphological variation has curtailed diversity down to 30 acritarch morphotypes, ten of which represent distinct abundance peaks broadly corresponding to acritarch genera. This analysis illustrates how population-based studies of early Cambrian acritarchs can help to discern the different factors that impinge on acritarch morphology, detect instances of taxonomic inflation, and refine our measures of diversity at the base of early Palaeozoic food webs.

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Precambrian Microfossils: Indicators of Early Life and Environments on the Earth

Samant

2024

Society of Earth Scientists Series

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Organic walled microfossils from the Neoproterozoic Owk Shale, Kurnool Group, South India

Cited by 7 publications

References 68 publications

Acritarch clusters from the Cambrian (Miaolingian) of the Příbram-Jince Basin, Czech Republic

Acritarch clusters from the Cambrian (Miaolingian) of the Příbram-Jince Basin, Czech Republic

Organic-walled microfossils from the lower Cambrian of North Greenland: a reappraisal of diversity

Precambrian Microfossils: Indicators of Early Life and Environments on the Earth

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