New records of Ediacaran Acraman ejecta in drillholes from the Stuart Shelf and Officer Basin, South Australia

Andrew C. Hill, Peter W. Haines, Kathleen Grey, Sebastian Willman

Research output: Contribution to journalArticleResearchpeer-review

Abstract

New occurrences of the Acraman impact ejecta layer were recently discovered in two South Australian drillholes, SCYW-79 1a (Stuart Shelf) and Munta 1 (Officer Basin) using lithostratigraphy, acritarch biostratigraphy, carbon isotope stratigraphy, and biomarker anomalies to predict the stratigraphic position. The ejecta layer is conspicuous because it consists of pink, sand-sized, angular fragments of volcanic rock distributed along the bedding plane surface of green marine siltstone. In SCYW-79 1a it forms a layer 5 mm thick; in Munta 1 the ejecta layer is thin and discontinuous because of its distance (∼550 km) from the impact structure. Palynological, biomarker, and carbon isotope anomalies can now be shown to coincide with the ejecta layer in SCYW-79 1a and Munta 1 suggesting the Acraman impact event may have had far reaching influences on the rapidly evolving Ediacaran biological and geochemical cycles.

LanguageEnglish
Pages1883-1891
Number of pages9
JournalMeteoritics and Planetary Science
Volume42
Issue number11
Publication statusPublished - Nov 2007

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Ediacaran
ejecta
shelves
new record
carbon isotopes
basin
biomarkers
carbon isotope
biomarker
isotopes
anomalies
geochemical cycle
anomaly
acritarch
impact structure
lithostratigraphy
bedding plane
stratigraphy
siltstone
biostratigraphy

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Hill, Andrew C. ; Haines, Peter W. ; Grey, Kathleen ; Willman, Sebastian. / New records of Ediacaran Acraman ejecta in drillholes from the Stuart Shelf and Officer Basin, South Australia. In: Meteoritics and Planetary Science. 2007 ; Vol. 42, No. 11. pp. 1883-1891.
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New records of Ediacaran Acraman ejecta in drillholes from the Stuart Shelf and Officer Basin, South Australia. / Hill, Andrew C.; Haines, Peter W.; Grey, Kathleen; Willman, Sebastian.

In: Meteoritics and Planetary Science, Vol. 42, No. 11, 11.2007, p. 1883-1891.

Research output: Contribution to journalArticleResearchpeer-review

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