Calcareous nannofossils from the Toolebuc Formation, Eromanga Basin, Australia

Calcareous nannofossils in the Toolebuc Formation reference section and in the lowermost Allaru Mudstone in BMR Boulia 3 suggest a middle to late Albian age. The evidence includes the presence of the key species Prediscosphaera columnata in assemblages overwhelmingly dominated by Tranolithus orionatus, the cool-water guide species Seribiscutum primitivum, and Watznaueria barnesae. Similar evidence is found in a core sample from BMR Tambo 38. Biostratigraphic subdivisions based on coeval foraminifera, dinoflagellates, spores and pollen are discussed. The nannofossil evidence points to deposition at high palaeolatitudes and/ or in a near-surface cool-water regime in an isolated basin with intermittent connection to the open sea. Indications of environmental stresses are thought to be linked mainly with changes in the salinity of the near-surface waters. The nannofossil record depended not only on the initial presence of the nannoflora in the surface waters, but also on the effect on preservation of fluctuating (reducing and oxidising) conditions at the water/ sediment interface, characteristic of epicontinental seas in high latitudes. A new calcareous nannofossil species, Tegumentum toolebucum, is described.

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Date (Publication)
1984-01-01T00:00:00
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Geoscience Australia Persistent Identifier/https://pid.geoscience.gov.au/dataset/ga/81180

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Bureau of Mineral Resources, Geology and Geophysics

 Canberra
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Shafik, S.

 1
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BMR Journal of Australian Geology and Geophysics

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9:2:171-181

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Commonwealth of Australia (Geoscience Australia)
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Commonwealth of Australia (Geoscience Australia)

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Australian and New Zealand Standard Research Classification (ANZSRC)

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4.0

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2018-11-01T00:00:00
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English
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Australian Government Security ClassificationSystem

Edition date
2018-11-01T00:00:00
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https://www.protectivesecurity.gov.au/Pages/default.aspx

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Unclassified

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urn:uuid/fae9173a-7079-71e4-e044-00144fdd4fa6

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English
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UTF8
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Commonwealth of Australia (Geoscience Australia)

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AGSO BMR Journal

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eCatId/81180

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https://ecat.ga.gov.au/geonetwork/srv/eng/catalog.search#/metadata/fae9173a-7079-71e4-e044-00144fdd4fa6

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2018-04-20T06:10:00
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2014-06-03T00:00:00

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AU/NZS ISO 19115-1:2014

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ISO 19115-1:2014

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ISO 19115-3

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Geoscience Australia Community Metadata Profile of ISO 19115-1:2014

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Version 2.0, September 2018

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https://pid.geoscience.gov.au/dataset/ga/122551

 
 

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