Calcareous sediments deposited in Warnbro sound, a small barred basin on the southwest coast of Western Australia, are derived principally from shells of mollusks and foraminifers and contain little or no terrigenous material. Organic muds accumulating in the deeper, stagnant waters of the basin constitute potential petroleum source sediments; porous sands of the basin sill, together with Pleistocene calcarenites of the coastal reefs, represent possible reservoir rocks.

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