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Calcareous nannofossils from the Toolebuc Formation, Eromanga Basin, Australia

Created 17/10/2025

Updated 17/10/2025

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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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Field Value
Title Calcareous nannofossils from the Toolebuc Formation, Eromanga Basin, Australia
Language eng
Licence Not Specified
Landing Page https://data.gov.au/data/dataset/99fdf7c2-4f47-4662-809e-c47a167fc045
Contact Point
Geoscience Australia Data
clientservices@ga.gov.au
Reference Period 20/04/2018
Geospatial Coverage
Map data © OpenStreetMap contributors
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  "type": "Polygon"
}
Data Portal Geoscience Australia

Data Source

This dataset was originally found on Geoscience Australia "Calcareous nannofossils from the Toolebuc Formation, Eromanga Basin, Australia". Please visit the source to access the original metadata of the dataset:
https://ecat.ga.gov.au/geonetwork/srv/eng/csw/dataset/calcareous-nannofossils-from-the-toolebuc-formation-eromanga-basin-australia