Frond-like fossils from the base of the late Precambrian Wilpena Group, South Australia

Dyson, Ian A.

doi:10.1038/318283a0

Cited by 14 publications

(7 citation statements)

References 6 publications

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“…The subjacent Wonoka and Bunyeroo Formations represent a transgressive clastic sequence, and overlie the ABC Range Quartzite and Brachina Formation (Preiss et al, 1981). Jenkins (1981) Cloud & Glaessner, 1982) and Dyson (1985) recently reported frondlike fossils from sandstones that intertongue with carbonates of the Nuccaleena Formation. The Nuccaleena carbonates, which overlie the uppermost tiUites of the Elatina Formation (Preiss et al, 1981), mark the base of the Ediacarian System as proposed by Cloud & Glaessner (1982 Cooraberra Sandstone Member and Woomera Shale Member.…”

Section: Geological and Stratigraphic Summarymentioning

confidence: 98%

Micropalaeontology of the Late Proterozoic Arcoona Quartzite Member of the Tent Hill Formation, Stuart Shelf, South Australia

Damassa

Knoll

1986

Alcheringa: An Australasian Journal of Palaeontology

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Section: Geological and Stratigraphic Summarymentioning

confidence: 98%

Micropalaeontology of the Late Proterozoic Arcoona Quartzite Member of the Tent Hill Formation, Stuart Shelf, South Australia

Damassa

Knoll

1986

Alcheringa: An Australasian Journal of Palaeontology

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“…1A, B) is generally regarded as the prime distinguishing characteristic of the terminal Proterozoic (no matter how such a unit might be defined). With the single possible exception of a dubious pennatulid-like fossil found 26 m below the base of the Nuccaleena Formation at Horrocks Pass near Wilmington (Dyson 1985), subsequently regarded as inorganic (Jenkins 1986), and the contentious structure Bunyerichnus dalgarnoi Glaessner low in the Wilpena Group (see Fig. 5 for stratigraphic units), all known examples of the Ediacara Biota in South Australia have been described from the upper part of the Wilpena Group (Jenkins 1995), with the best known members of the assemblage being restricted to the Pound Subgroup in the upper part of the Wilpena Group.…”

Section: Issues and Opportunitiesmentioning

confidence: 99%

The Ediacaran Period: a new addition to the geologic time scale

Knoll

Walter

Narbonne

et al. 2006

LET

319

152

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The International Union of Geological Sciences has approved a new addition to the geologic time scale: the Ediacaran Period. The Ediacaran is the first Proterozoic period to be recognized on the basis of chronostratigraphic criteria and the first internationally ratified, chronostratigraphically defined period of any age to be introduced in more than a century. In accordance with procedures established by the International Commission on Stratigraphy, the base of the Ediacaran Period is defined by a Global Stratotype Section and Point (GSSP) placed at the base of the Nuccaleena Formation cap carbonate directly above glacial diamictites and associated facies at Enorama Creek in the Flinders Ranges of South Australia. Its top is defined by the initial GSSP of the Cambrian Period. The new Ediacaran Period encompasses a distinctive interval of Earth history that is bounded both above and below by equally distinctive intervals. Both chemostratigraphic and biostratigraphic data indicate that the subdivision of the period into two or more series is feasible, and this should be a primary objective of continuing work by the Ediacaran Subcommission of the ICS.

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“…Several potential sequence boundaries are present in the interval between the Pertatataka Formation and Arumbera Sandstone, which is relatively condensed at the level of the Julie Formation, but no firm correlations with several prominent sequence boundaries in the Adelaide geosyncline are yet possible. The context of the sequence-stratigraphic interpretation with respect to the timing of glaciation and rifting and published information on acritarchs, Ediacaran body fossils, trace fossils and shelly fossils is indicated on the right (from Webb and Coats, 1980;Dyson, 1985;Fanning et al, 1986;Preiss, 1987;Walter et al, 1989;Walter, 1989, 1992;Lindsay and Korsch, 1991;Knoll and Walter, 1992;Mount and McDonald, 1992;Bowling et al, 1993;Jenkins et al, 1993). Fig.…”

Section: Comparison With the Amadeus Basinmentioning

confidence: 99%

“…The most prominent surfaces, all characterized at least locally by erosional relief of many tens of metres, are sequence boundaries 9 (Wonoka canyons; ~ 566 Ma), 10 (upper Wonoka Formation; ~561 Ma) and 12 (base of the Ediacara Member of the Rawnsley Quartzite; ~ 552 Ma). Boundaries 9 and 10 are both located above the level of "early Ediacaran" body fossils (Dyson, 1985) and large complex acritarchs Walter, 1989, 1992;Knoll and Walter, 1992), but below the level of latest Proterozoic trace fossils (assemblage II of Walter et al, 1989) and the main Ediacaran interval (Jenkins et al, 1983). Boundary 12 is below the main Ediacaran interval, but within the interval containing assemblage II trace fossils.…”

Section: Comparison With the Amadeus Basinmentioning

confidence: 99%

Sequence stratigraphy and the interpretation of Neoproterozoic earth history

Christie‐Blick

Dyson

Vonderborch

1995

Precambrian Research

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The application of sequence stratigraphy to Neoproterozoic successions is important for improving the resolution of timecorrelation within individual sedimentary basins and potentially at a global scale. The methodology is illustrated in this paper by reference to two contrasting examples from the Hinders Ranges (Adelaide geosyncline) of South Australia, where the younger part of the Neoproterozoic to earliest Cambrian succession (~ 770 Ma to ~ 540 Ma) has been divided into thirteen unconformity-bounded depositional sequences. One of the most prominent sequence boundaries, at or near the base of the Wonoka Formation, is characterized by a series of buried canyons as much as 1 km deep. High-resolution sequence-stratigraphic studies at Umberatana syncline continue to support the view that the canyons were cut subaerially and filled by fluvial and shallow-water sediments. In contrast to the Wonoka canyons, sequence boundaries interpreted at the base of the Nuccaleena Formation/Seacliff Sandstone and near the top of the ABC Range Quartzite are relatively subtle, with only limited evidence for erosion and valley incision. Four sequence boundaries, at the level of the Sturtian and Marinoan (Varanger?) glacial deposits and in the vicinity of the Precambrian-Cambrian boundary, are thought to correlate with surfaces in the Amadeus basin of central Australia. Other prominent sequence boundaries, including the Wonoka canyons and surfaces within the upper part of the Wonoka Formation and at the base of the Ediacara Member of the Rawnsley Quartzite, correspond with a relatively condensed section in the Amadeus basin, and their lateral persistence beyond the Adelaide geosyncline is therefore difficult to evaluate. Given the lack of precision in biostratigraphy and isotope geochemistry in Neoproterozoic rocks, and in a marked departure from Phanerozoic practice, we recommend placement of a terminal Proterozoic GSSP at a sequence boundary. A prime candidate in Australia is the sequence boundary at the base of the Nuccaleena Formation/Seacliff Sandstone, immediately above the Marinoan glacial rocks in the Adelaide geosyncline, and its likely correlative at or near the base of the Gaylad Sandstone in the Amadeus basin.

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Frond-like fossils from the base of the late Precambrian Wilpena Group, South Australia

Cited by 14 publications

References 6 publications

Micropalaeontology of the Late Proterozoic Arcoona Quartzite Member of the Tent Hill Formation, Stuart Shelf, South Australia

Micropalaeontology of the Late Proterozoic Arcoona Quartzite Member of the Tent Hill Formation, Stuart Shelf, South Australia

The Ediacaran Period: a new addition to the geologic time scale

Sequence stratigraphy and the interpretation of Neoproterozoic earth history

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