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They are massive longitudinal dunes, I believe. Researched it some more, found this:
> Present theory suggests most of the current dune systems in Australia were formed by a dominating sub tropical anti cyclonic air system which has prevailed over the Australian continent for the past 20 to 30,000 years, continually picking up dust and sand from depot centres and depositing it as vast longitudinal dunes, some over 100kms in length.