Neoproterozoic microfossils from the Officer Basin, Western Australia

Cotter, Kaye L.

doi:10.1080/03115519708619166

Cited by 17 publications

(7 citation statements)

References 26 publications

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“…Additionally, the Browne Formation, Officer Basin, Western Australia, early Neoproterozoic (Cotter, 1997). NE Siberian Platform, Yakutia, Svetlin Formation, Middle Riphean; Aldan River section, Yudoma Formation, Vendian; South Kazakhstan, Maly Karatau, Chikchan Formation, Vendian; South Urals, Satkin, Avzyan and Minyar formations, Lower to Upper Riphean, respectively (Sergeev, 2006).…”

Section: Siphonophycus Kestronmentioning

confidence: 99%

New records of late Ediacaran microbiota from Poland

Moczydłowska

2008

Precambrian Research

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a b s t r a c tNew records of organic-walled microfossils, including cyanobacteria, phytoplankton (certain acritarchs) and some microbiota of unknown biological affinities, are reported from the late Ediacaran Włodawa Formation in the Łopiennik IG-1 borehole, Poland. The microfossil association consists mostly of known species, which originated prior to the Cryogenian Period, evidence that these microorganisms survived the Neoproterozoic glacial epochs. The longevity of most of the species is extended herein to ca. 545 Ma. One species is new but described as gen. et sp. indet., because only a single specimen is available. Although the microfossils represent both prokaryotic and eukaryotic groups of organisms, and benthic and planktic modes of life, all, with the exception of Valkyria, are photoautotrophic aerobes. Metabolic processes of nutrition, respiration and reproductive cycles, and ecologic habitats of these biota and the evolutionary lineages to which they belong are analyzed with respect to the basic requirements needed to survive prolonged periods of environmental perturbation.All recorded here cyanobacteria are benthic microbial mat-dwellers, requiring ample water and regular oxygen supply and sun light for their metabolism. Planktic species of Leiosphaeridia studied here are considered to be green algae (chlorophyceans), forming resting cysts and alternating sexual/vegetative generations in their life cycle. They also required habitats of well-oxygenated open water in the photic zone and periodic access to bottom sediment (to rest the cyst) in order to survive the glacial epochs, as they evidently did. It is argued that the natural habitats of all these biota must have been preserved and ecologically functional throughout the Cryogenian Period, and have been robust enough to sustain viable populations and genetic stocks of at least some evolutionary lineages known at the time. This is a primary constraint imposed by contemporaneous marine biosphere on the Earth System model, which can be accepted among hypothetical versions of the Snowball Earth hypotheses based on sedimentological, geochemical, physical and other geological records. The Slushball Earth model, or comparable, is thus favoured over strict Snowball Earth model because it reconciles the habitable conditions with other envisaged geo-and physical conditions during the period.

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Section: Siphonophycus Kestronmentioning

confidence: 99%

New records of late Ediacaran microbiota from Poland

Moczydłowska

2008

Precambrian Research

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“…In Australia, identical palynological successions are present in Empress 1A and Lancer 1 and are known from several other western Officer Basin drill holes, particularly LDDH 1, Kanpa 1A and Yowalga 3 (Grey & Cotter 1996;Cotter 1997Cotter , 1999Grey 1999aGrey , 2005aHill et al 2000a) ( Fig. 8.1).…”

Section: Palynologymentioning

confidence: 73%

“…Palynology provides good biostratigraphic control as well as indicating palaeoenvironment and thermal maturity. Microfossil assemblages consist predominantly of leiospheres, filaments and mat fragments, mostly of conservative, long-ranging species with simple morphologies, but containing some more complex and time-diagnostic species (Schopf 1968;Schopf & Barghoorn 1969;Fairchild 1976;Oehler 1976;Jackson & Muir 1981;Jackson & van de Graaff 1981;Zang & Walter 1992;Zang 1995;Grey & Cotter 1996;Cotter 1997Cotter , 1999Grey 1999aGrey , 2005aHill et al 2000a, b). Data have been obtained from at least 1000 samples from about 30 drill holes across Australia, several consisting of continuous core (Figs 8.1 & 8.6).…”

Section: Biostratigraphymentioning

confidence: 99%

“…In the western Officer Basin, they are present in the Browne Formation and its lateral equivalents (Jackson & van de Graaff 1981;Grey & Cotter 1996;Cotter 1997Cotter , 1999Grey 1999aGrey , 2005a. Well-preserved microfossils from chert in the Browne Formation at the Madley Diapirs (Jackson & van de Graaff 1981, p. 34;Cotter 1997) show low species diversity and mainly represent permineralized cyanobacterial mat. Palynomorphs from the Browne Formation in Browne 1 and 2, Kanpa 1A, Dragoon 1 and Yowalga 2 and 3 include Myxococcoides sp., Siphonophycus sp., Leiosphaeridia spp.…”

Section: Palynologymentioning

confidence: 99%

“…Walter et al 1995;Preiss 2000;Grey 2005b). Distribution data from Grey & Cotter (1996); Cotter 1997Cotter , 1999Grey 1999aGrey , 2005aGrey et al 2005b Preiss 1972Preiss , 1974Preiss , 1976Preiss , 1985Preiss , 1987Griffin & Preiss 1976;Grey 1999bGrey , 2005aHill et al 2000a (Hoffmann et al 2004;Condon et al 2005) for the Elatina Formation and equivalents; however, see Williams et al (2008) for an extended discussion of age constraints (adapted from Preiss 1987Preiss , 2000Walter et al 1995;Morton 1997;Grey et al 2005;Dunster et al 2007). The length of time breaks at major unconformities and sequence boundaries are estimates only.…”

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confidence: 99%

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Chapter 8 Biostratigraphy and stratigraphic subdivision of Cryogenian successions of Australia in a global context

Grey

Hill

Calver

2011

Memoirs

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Cryogenian correlation in Australia is based on an extensive data set from the Centralian Superbasin and Adelaide Rift Complex and integrates biostratigraphy and isotope chemostratigraphy to provide a three-dimensional interpretation based on outcrop and drill holes. Studies are ongoing, but newer data are consistent with the distributions discussed here. From the chemostratigraphic and biostratigraphic viewpoint, the first appearance of the acritarch Cerebrosphaera buickii, coupled with a large negative isotope excursion at c. 800 Ma, supported by the first appearance of the stromatolite Baicalia burra, seems to have potential for boundary placement. It is widely recognized across Australia and seems to have potential globally.

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