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A Composite Regolith Profile at Ceduna, South Australia.

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A composite regolith profile has been exposed by coastal erosion on a headland 1 km south of the Ceduna town jetty. The 4.2 m high profile consists of kaolinised and iron mottled Precambrian granitic rocks at the base, overlain successively by a metre of kaolinised siltstone, a 30 cm thick layer of ferruginous fine sand containing clasts of ferruginised sandstone and silcrete, and two calcrete layers developed on marl. The section is interpreted essentially as a local sequence: the siltstone was derived from the underlying weathered granitic rocks and the ferruginous horizon with numerous clasts is interpreted as a lag formed on a palaeo-shore platform later covered with sand. Iron was introduced by ground waters. A regional climatic change towards increased aridity is associated with the formation of the two overlying horizontal calcrete layers. Weathering of the basement rocks has been tentatively assigned to the late Tertiary and calcrete formation has been associated with the Pleistocene.


Document Type: Research Article

Publication date: September 1, 2006

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  • In 2004, the South Australian Museum and the Royal Society of South Australia became partners in Southern Scientific Press. This led to the amalgamation of their two professional journals. The Transactions of the Royal Society of South Australia now incorporates the Records of the South Australian Museum.
    Transactions of the Royal Society of South Australia deals with natural history relating to South Australia
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