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| Cadna-owie Formation | |
|---|---|
| Name | Cadna-owie Formation |
| Type | Geological formation |
| Period | Permian |
| Region | South Australia |
| Country | Australia |
Cadna-owie Formation The Cadna-owie Formation is a Permian stratigraphic unit in central Australia, notable for its thick evaporite sequences and cyclic siliciclastic beds. It crops out and underlies extensive parts of the Eromanga Basin, the Arckaringa Basin, and adjacent platforms, and has been the subject of studies by institutions such as the Geological Survey of South Australia and the Commonwealth Scientific and Industrial Research Organisation. The formation is essential to understanding Permian paleoenvironments on the Gondwana margin and has attracted research from universities including the University of Adelaide and the University of Queensland.
The Cadna-owie Formation lies within the Permian succession of the Eromanga Basin and correlates regionally with units studied in the Cooper Basin and the Great Artesian Basin. Its stratigraphic relationships include overlying the Callabonna Subgroup equivalents and being overlain by the Birkhead Formation and younger Mesozoic cover in parts of the intracratonic sequences. Work by the Australian Geological Survey Organisation and teams linked to the University of Sydney has refined its position within regional Permian chronostratigraphy and tied its depositional cycles to basin-wide transgressions and regressions recorded in the Beetaloo Basin and Cooper-Eromanga petroleum province.
Lithologically, the Cadna-owie consists of thick sequences of halite, gypsum, anhydrite, siltstone, and fine sandstone, with lateral facies changes documented by researchers from the University of Melbourne and the Federation University Australia. Sedimentological analyses by personnel from the South Australian Museum and the Queensland University of Technology describe cyclic evaporite deposition interbedded with deltaic and shallow-marine siliciclastics similar to facies models used in studies of the Permian Basin and the Zealandia margin analogues. Petrography and core descriptions conducted by the Bureau of Mineral Resources and industry groups such as Santos and Origin Energy reveal distinctive laminations and replacement textures comparable to evaporite-bearing units in the Dead Sea region and the Mediterranean Messinian sequences.
Biostratigraphic and radiometric work places the Cadna-owie within the Middle to Late Permian, contemporaneous with formations correlated to the Guadalupian and Lopingian stages recognized in international stratigraphic schemes endorsed by the International Commission on Stratigraphy. Paleontological finds reported by teams from the Australian National University and the South Australian Museum include sparse marine fossils and palynological assemblages that tie the unit to Gondwanan floras similar to those documented in the Karoo Supergroup and the Beacon Supergroup. Macrofaunal preservation is limited compared to coeval shelly successions such as the Maitland Group, but microfossil biostratigraphy and isotopic studies by scholars associated with the CSIRO have been critical for age constraints.
Interpretations of deposition place the Cadna-owie Formation within a restricted epicontinental sea on the western margin of Gondwana, influenced by arid climatic conditions also inferred from Permian paleoclimate studies at institutions like the British Antarctic Survey and the Lamont–Doherty Earth Observatory. Tectonic analyses link sediment supply and accommodation patterns to intracratonic subsidence and far-field stresses related to the assembly of Pangea, with regional comparisons drawn to rift- and sag-related evaporite basins such as the Zechstein and the Paradox Basin. Structural mapping by the Geological Survey of Queensland and basin modelling by industry geoscientists have shown how syndepositional faulting and halokinesis influenced facies distribution and later deformation.
The Cadna-owie Formation hosts evaporite sequences and seals that are important for petroleum systems in the Eromanga Basin and the Cooper Basin, assessed by companies including Beach Energy, Origin Energy, and Santos. Its halite and anhydrite units serve as regional seals for conventional hydrocarbon accumulations and are considered in unconventional hydrocarbon and geothermal evaluations carried out by the Australian Energy Market Operator and research groups at the University of New South Wales. Mineral exploration assessments by the South Australian Department for Energy and Mining have considered the evaporites for industrial salts and the siliciclastic intervals for potash analogues similar to deposits exploited in Saskatchewan and Germany.
Scientific attention to the Cadna-owie began with mapping by the Bureau of Mineral Resources in the mid-20th century, followed by stratigraphic revisions and core-based studies published by academics at the University of Adelaide and the University of New England. Key outcrops and drillhole sections are accessible near localities such as Cooper Creek, Innamincka and parts of the Simpson Desert margin; these have been sampled and logged by collaborative teams from the South Australian Museum, Geoscience Australia, and industry partners. International collaborations and basin syntheses involving the International Association of Sedimentologists and the Society for Sedimentary Geology continue to refine models for the formation's role in Permian palaeogeography and resource potential.
Category:Geologic formations of AustraliaCategory:Permian System