The Cretaceous of the Eromanga and Surat Basins
Little deformed Cretaceous sedimentary rocks underlie 1 500 000 km^2 of eastern Australia. Depositional environments in them range from freshwater to shallow marine. The Neocomian and Aptian sequences are quartz-rich, and the Albian and Cenomanian sequences are quartz-poor. The older sequences were derived largely from nearby basement rises, while the younger sequences were probably derived from Cretaceous volcanics forming a mountain range to the northeast. Glauconie is common in marine and paralic sequences. An epicontinental sea, with seaways to the north and east, covered the basins in the late Aptian, but the eastern seaway closed during an early Albian regression. A second transgressive-regressive cycle, in the late Albian, was virtually confined to the Eromanga Basin. Collectively the two transgressions and regressions were spread over about 20 million years. The present Baltic Sea is thought to provide a small-scale depositional model for the sequences under consideration: of an epicontinental sea in a cool climate, in which the salinity, the number of planktonic organisms, and the variety of benthonic organisms, decrease away from the ocean. The shallowness of the sea and its entrances mean that it is very susceptible to major environmental changes, caused by such factors as eustatic changes of sea level. The area had a gentle northwesterly regional tilt during the Cretaceous, but mid-Tertiary movements changed this to southwesterly. Despite subsequent erosion, as much as 2000 m of Cretaceous sediment is preserved in the Eromanga Basin, and 700 min the Surat Basin.
Simple
Identification info
- Date (Publication)
- 1976-01-01T00:00:00
- Citation identifier
- Geoscience Australia Persistent Identifier/https://pid.geoscience.gov.au/dataset/ga/80863
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Role Organisation / Individual Name Details Publisher Bureau of Mineral Resources, Geology and Geophysics
Canberra Author Exon, N.F.
1 Author Senior, B.R.
2
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BMR Journal of Australian Geology and Geophysics
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1:1:33-50
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Role Organisation / Individual Name Details Custodian Corp
Owner Commonwealth of Australia (Geoscience Australia)
Custodian Commonwealth of Australia (Geoscience Australia)
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Product data repository: Various Formats
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Data Store directory containing the digital product files
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GA Publication
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Journal
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- Australian and New Zealand Standard Research Classification (ANZSRC)
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Earth Sciences
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Published_External
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Creative Commons Attribution 4.0 International Licence
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CC-BY
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4.0
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Australian Government Security ClassificationSystem
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- 2018-11-01T00:00:00
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Journal article (pdf)
Journal article (pdf)
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pdf
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GA Publication
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Australian Government Security ClassificationSystem
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- 2018-11-01T00:00:00
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GeoNetwork UUID
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Role Organisation / Individual Name Details Point of contact Commonwealth of Australia (Geoscience Australia)
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AGSO BMR Journal
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Geoscience Australia - short identifier for metadata record with
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- Date info (Revision)
- 2018-04-20T06:08:45
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- 2014-06-03T00:00:00
Metadata standard
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AU/NZS ISO 19115-1:2014
Metadata standard
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ISO 19115-1:2014
Metadata standard
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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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