The stratigraphy, structure, oil possibilities, and results of exploration in Australia's principal sedimentary basins are reviewed. With the exception of the Gippsland basin, where a little oil has been produced from marine Miocene strata, no important surface indications or showings in wells have been recorded. It is concluded that the generally limited development of marine Mesozoic and Tertiary rocks, and the extensive metamorphism and plutonic invasion undergone by the pre-Permian formations, especially in the central and eastern parts of the continent, make it unlikely that large oil accumulations are present. Moderate prospects exist in four basins of western and northwestern Australia, where the Westralian geosynclinal sea occupied embayments and coastal areas at various times during the upper Paleozoic, Mesozoic, and Tertiary.

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