Ediacaran microfossils from the Doushantuo Formation chert nodules in the Yangtze Gorges area, South China, and new biozones

Moczydłowska, Małgorzata

doi:10.1002/9781119564225.ch1

Cited by 43 publications

(6 citation statements)

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“…It is a rich microfossil assemblage consisting mainly of reworked and redeposited acanthomorphic acritarchs, multicellular algae, tubular microfossils, putative animals, and animal embryos (Xiao et al, 2014). Similar microfossil assemblages have been recovered from chert nodules in the lower part (Member II) of the Doushantuo Formation (Liu and Moczydłowska, 2019;Ouyang et al, 2021). The lowest occurrence of such chert nodules is ∼2.8 m above the cap dolostone (Ouyang et al, 2021), with an estimated age close to 632 Ma (Condon et al, 2005).…”

Section: Discussion and Conclusion A Ca 602 Ma Age For The Lantian Biotamentioning

confidence: 74%

“…The Ediacaran Period (635-541 Ma) marks a pivotal time in the evolution of life, when complex macroscopic eukaryotes irreversibly attained ecological dominance (Xiao and Narbonne, 2020). Ediacaran stratigraphic successions host abundant fossil assemblages that mainly include acanthomorphic acritarchs (microscopic marine planktonic organisms of uncertain, and possibly various, taxonomic affinities) in the lower Ediacaran and macroscopic, morphologically complex, soft-bodied Ediacara-type fossils in the upper Ediacaran (Liu et al, 2015;Droser et al, 2017;Liu and Moczydłowska, 2019;Xiao and Narbonne, 2020). A remarkable biological evolution in the Ediacaran Period is the increasing macroscopic complexity exhibited by the Lantian biota, which occurs in the lower slope to basinal black shales of the Lantian Formation, China (Fig.…”

Section: Introductionmentioning

confidence: 99%

“…Eight genera and 13 species of macroalgal fossils have been recognized as the main components of the Lantian biota (Yuan et al, 2013). Together with contemporary microalgal fossils preserved in the Weng'an biota and acanthomorphic acritarch assemblages (Liu and Moczydłowska, 2019;Ouyang et al, 2021), the fossils represent a major episode of radiation and diversification of algae in the early-middle Ediacaran. This bloom of algae may have facilitated oceanic oxygenation and the evolution of metazoa in the Ediacaran (Brocks et al, 2017).…”

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confidence: 99%

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Implications for Ediacaran biological evolution from the ca. 602 Ma Lantian biota in China

Yang

Selby

et al. 2022

Geology

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The morphologically differentiated benthic macrofossils of algae and putative animal affinities of the Lantian biota in China represents the oldest known Ediacaran macroscopic eukaryotic assemblage. Although the biota provides remarkable insights into the early evolution of complex macroeukaryotes in the Ediacaran, the uncertainty in its age has hampered any robust biological evaluation. We resolve this issue by applying a petrographic-guided rhenium-osmium (Re-Os) organic-bearing sedimentary unit study on the Lantian biota. This work confines a minimum age for the first appearance of the Lantian biota to 602 ± 7 Ma (2σ, including decay constant uncertainty). This new Re-Os date confirms that the Lantian biota is of early–mid Ediacaran age and temporally distinct from the typical Ediacaran macrobiotas. Our results indicate that the differentiation and radiation of macroscopic eukaryotes, and the evolution of the primitive, erect epibenthic ecosystem, occurred in the early–mid Ediacaran and were associated with highly fluctuating oceanic redox conditions. The radiogenic initial 187Os/188Os ratios derived from the Lantian (1.14 ± 0.02) and other Ediacaran shales invoke oxidative weathering of upper continental crust in the early–middle Ediacaran, which may have stimulated the evolution of life and oceanic-atmospheric oxygenation. Integrated with published Ediacaran chronological and geochemical data, our new Re-Os geochemical study of the Lantian black shale provides a refined, time-calibrated record of environment and eukaryote evolution during the Ediacaran.

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Section: Discussion and Conclusion A Ca 602 Ma Age For The Lantian Biotamentioning

confidence: 74%

Section: Introductionmentioning

confidence: 99%

mentioning

confidence: 99%

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Implications for Ediacaran biological evolution from the ca. 602 Ma Lantian biota in China

Yang

Selby

et al. 2022

Geology

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“…nov. bear close similarities with those of the Ediacaran taxon Cavaspina basiconica Moczydłowska Vidal and Rudavskaya (1993) (Moczydłowska et al 1993, fig. 8; Liu and Moczydłowska 2019, fig. 39), being either tubular or swollen/conical at the base, and grading into a more slender, hair-like distal portion.…”

Section: Discussionmentioning

confidence: 99%

“…Tappania [Yin 1997; Prasad et al 2005; Leiming et al 2005; Nagovitsin et al 2010; Javaux and Knoll 2017. Singh et al 2019] and Appendisphaera [Moczydłowska et al 1993; Liu et al 2014; Liu and Moczydłowska 2019; Anderson et al 2019; Xiao et al 2022]); an observation that casts serious doubts on any potential relationship between them. On the other hand, the distinct process morphology of Pearisphaeridium densispinosum (Vidal 1993) comb.…”

Section: Discussionmentioning

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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Research Progress of Ediacaran (Sinian) Biostratigraphy in South China

Yin¹,

Tang²

2022

Meso-Neoproterozoic Geology and Petroleum Resources in China

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Ediacaran microfossils from the Doushantuo Formation chert nodules in the Yangtze Gorges area, South China, and new biozones

Cited by 43 publications

References 135 publications

Implications for Ediacaran biological evolution from the ca. 602 Ma Lantian biota in China

Implications for Ediacaran biological evolution from the ca. 602 Ma Lantian biota in China

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

Research Progress of Ediacaran (Sinian) Biostratigraphy in South China

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