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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Product Type/Sub Type

nonGeographicDataset

Constraints

Creative Commons Attribution 4.0 International Licence

IP Owner

Commonwealth of Australia (Geoscience Australia)

Author(s)

Date (publication)

1984-01-01T00:00:00

Product Type

nonGeographicDataset

Topic Category

geoscientificInformation

GA Catalogue Number

81180 Product http://www.ga.gov.au/metadata-gateway/metadata/record/81180/

Keywords

GA Publication
Journal
Earth Sciences

Resource Language

English

Resource Character Set

utf8

Resource Security Classification

unclassified

Geographic Extent

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

Lineage

Unknown

Digital Transfer Options

onLine

Distributor

Role
distributor
Organisation Name
Commonwealth of Australia (Geoscience Australia)
City
Canberra
Administrative Area
ACT
Postal Code
2601
Country
Australia
Email Address

Source Description

Source data not available.

Metadata File Identifier

fae9173a-7079-71e4-e044-00144fdd4fa6

Metadata Standard Name

ANZLIC Metadata Profile: An Australian/New Zealand Profile of AS/NZS ISO 19115:2005, Geographic information - Metadata

Metadata Standard Version

1.1

METADATA SECURITY CLASSIFICATION

unclassified

Metadata Contact

Role
pointOfContact
Organisation Name
Commonwealth of Australia (Geoscience Australia)
City
Canberra
Administrative Area
ACT
Postal Code
2601
Country
Australia
Email Address
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