Citation

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Shafik, S., 1984. Calcareous nannofossils from the Toolebuc Formation, Eromanga Basin, Australia. BMR Journal of Australian Geology and Geophysics  9:2:171-181. Bureau of Mineral Resources, Geology and Geophysics, Canberra.

Abstract

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.
Google map showing geographic bounding box with values North bound -10.87 East bound 153.36 West bound 135.43 South bound -30.71
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Date (publication)

1984

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Earth Sciences

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English

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-10.87
East bound
153.36
West bound
135.43
South bound
-30.71

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2015-05-19

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