Neoproterozoic (Ediacaran) diversification of acritarchs—A new record from the Murnaroo 1 drillcore, eastern Officer Basin, Australia

Willman, Sebastian; Moczydłowska, Małgorzata; Grey, Kathleen

doi:10.1016/j.revpalbo.2005.07.014

Cited by 65 publications

(45 citation statements)

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“…Two notable exceptions are Oman (South Oman Salt Basin) and Australia (Centralian Superbasin) and these resulted in benchmark papers on, for example, the study of S isotopes, biospheric evolution, geochronology, micropalaeontology, and even one of the earliest papers on cap carbonates (e.g. Amthor et al, 2003;Bowring et al, 2007;Eyles et al, 2007;Fike and Grotzinger, 2008;Fike et al, 2006;Kennedy, 1996;Lindsay and Leven, 1996;Logan et al, 1995;Pisarevsky et al, 2001;Walter et al, 2000;Willman et al, 2006). This is prime evidence of the value of drill core for obtaining important data and insights.…”

Section: The Need For Scientific Drilling To Accelerate Neoproterozoimentioning

confidence: 99%

Accelerating Neoproterozoic research through scientific drilling

Condon

Boggiani²,

Fike

et al. 2015

Sci. Dril.

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Section: The Need For Scientific Drilling To Accelerate Neoproterozoimentioning

confidence: 99%

Accelerating Neoproterozoic research through scientific drilling

Condon

Boggiani²,

Fike

et al. 2015

Sci. Dril.

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“…The Neoproterozoic is characterized by extreme climate change, oscillations in oceanic geochemistry, a significant oxygenation event, and the diversification of the marine biota (Hoffman and Schrag 2002, Willman et al 2006, Frei et al 2009, Halverson et al 2010. Several near-global glacial events ocurred between 740 and 580 Ma, considered as a bottleneck for marine biota evolution Knoll 1995, Moczydłowska 2008).…”

Section: Introductionmentioning

confidence: 99%

Acritarchs of the Ediacaran Frecheirinha Formation, Ubajara Group, Northeastern Brazil

Chiglino

Gaucher

Sial

et al. 2015

An. Acad. Bras. Ciênc.

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We report for the first time the occurrence of organic-walled microfossils in Ediacaran limestones and marls of the Frecheirinha Formation, Ubajara Group, and the first Precambrian acritarchs so far reported for northeastern Brazil. The assemblage of the Frecheirinha Formation represents a low-diversity microflora comprising Leiosphaeridia, Lophosphaeridium and subordinated Bavlinella (=Sphaerocongregus). Sr values between 0.7075 and 0.7080 suggest an Ediacaran age. The acritarch assemblage is comparable to the Late Ediacaran Leiosphere Palynoflora (LELP) or Kotlin-Rovno assemblage, in broad agreement with chemostratigraphic data. Macrofossils belonging to the Ediacara fauna were reported from the overlying Jaibaras Group, which would constrain even further the depositional age of the Frecheirinha Formation to within ca. 575-555 Ma. A more comprehensive palynological study of the Frecheirinha Formation is necessary to confirm this age assignment.

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“…Her data also show that Doushantuo-Pertatataka acritarchs, with one possible exception, appear to occur only after the Acraman impact ejecta layer (Figure 7), and not until a second post-glacial transgression after the Marinoan glaciation. Thus, Grey and colleagues (Grey et al 2003;Willman et al 2006) concluded that the diversification of Doushantuo-Pertatataka acritarchs was unlikely to have been caused by the Marinoan glaciation; instead it was probably related to the Acraman impact, which was estimated to have occurred about 578 Ma (Walter et al 2000).…”

Section: The Diversification Of Doushantuo-pertatataka Acritarchsmentioning

confidence: 99%

“…These are a unique assemblage of large, morphologically complex, acanthomorphic acritarchs that occur in Ediacaran successions in South China (Yuan and Hofmann 1998;Zhang et al 1998;Zhou et al 2001a;Xiao 2004a), Australia (Zang and Walter 1992;Grey 2005;Willman et al 2006), Siberia (Moczydłowska et al 1993, Moczydłowska 2005, India (Tiwari and Knoll 1994) and Svalbard (Knoll 1992). In Australia, detailed sampling suggests that, with one possible exception (Grey et al 2003, p. 461), Doushantuo-Pertatataka acritarchs appear mainly after the Acraman impact ejecta layer (Grey et al 2003;Grey 2005) that is estimated to be $578 Ma (Walter et al 2000).…”

Section: Introductionmentioning

confidence: 99%

The diversification and extinction of Doushantuo‐Pertatataka acritarchs in South China: causes and biostratigraphic significance

et al. 2006

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The Ediacaran Period immediately follows the last Cryogenian glaciation-the $635 Ma Marinoan or Nantuo glaciation, and it is also punctuated by another brief glaciation-the $582 Ma Gaskiers glaciation. It is possible that these glaciations may have had significant impact on Ediacaran biological evolution (e.g. the appearance or disappearance of Doushantuo-Pertatataka acritarchs). Alternative hypotheses propose that the diversification of Doushantuo-Pertatataka acritarchs was caused by the Acraman bolide impact or by emerging eumetazoans. To test these hypotheses, high-resolution geochronological and biostratigraphic data are required. The Doushantuo Formation in South China, radiometrically constrained between $635 and $551 Ma, has the potential to clarify the global picture of early-middle Ediacaran evolution. Here we present preliminary biostratigraphic data from the Doushantuo Formation in the East Yangtze Gorges area and new d 13 C chemostratigraphic data from the Doushantuo Formation at Weng'an. These and previously published palaeontological data, aided by the tool of d 13 C chemostratigraphy, indicate that the biostratigraphic record of the Doushantuo Formation is locally sensitive to the availability of specific taphonomic windows. In the East Yangtze Gorges area, Doushantuo-Pertatataka acritarchs first appeared shortly after the termination of the Nantuo glaciation and gradually diversified throughout the Doushantuo Formation. At Weng'an, however, such acritarchs first appear-abruptly and in much greater diversity-in phosphorite of the upper Doushantuo Formation, immediately above a subaerial exposure surface. Thus, the biostratigraphic pattern in the East Yangtze Gorges area permits, whereas that at Weng'an apparently disallows, a causal relationship between the Nantuo glaciation and the diversification of Doushantuo-Pertatataka acritarchs. We conclude that the biostratigraphic record is incomplete at Weng'an, where the early Ediacaran evolutionary history is not preserved. The South China data indicate that special attention has to be paid to taphonomic and palaeoenvironmental analysis before extrapolating local and regional biostratigraphic ranges to make global interpretations.It is less clear when Doushantuo-Pertatataka acritarchs disappeared. Previous investigators have variously suggested that they disappeared before, at, or after, the Gaskiers glaciation. These hypotheses are difficult to test because of the lack of sedimentary evidence for the Gaskiers glaciation in South China and other regions (e.g. South Australia) where Doushantuo-Pertatataka acritarchs are abundant. In Australia, Doushantuo-Pertatataka acritarchs are thought to have experienced a sharp decline after the Egan glaciation, which may well be equivalent to the Gaskiers glaciation. If true, then Doushantuo-Pertatataka acritarchs are largely restricted to the interval between the Nantuo and Gaskiers glaciations. This conclusion allows us to place constraints on the possible causes of the diversification and extinction of Doushant...

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Neoproterozoic (Ediacaran) diversification of acritarchs—A new record from the Murnaroo 1 drillcore, eastern Officer Basin, Australia

Cited by 65 publications

References 35 publications

Accelerating Neoproterozoic research through scientific drilling

Accelerating Neoproterozoic research through scientific drilling

Acritarchs of the Ediacaran Frecheirinha Formation, Ubajara Group, Northeastern Brazil

The diversification and extinction of Doushantuo‐Pertatataka acritarchs in South China: causes and biostratigraphic significance

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